Zhu, Ran (2015) Broadband Linearization Technologies for Broadband Radio-over-Fiber Transmission Systems. PhD thesis, Concordia University.
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Abstract
Wireless access networks consist of three sections, i.e., back-haul, front-haul, and wireless transmission, where the front-haul transmission systems are to distribute radio frequency (RF) signals to antenna towers. For current low-capacity wireless access, RF signals over coaxial cables, digital fiber-optic transmission, microwave point-to-point transmission, and narrowband radio-over-fiber (RoF) transmission have been used for the front-haul transmission systems. However, with the increase of demand of high capacity wireless access and also use of massive multiple-input and multiple-output (MIMO) antennas, low-cost, simple and broadband front-haul transmission systems are required in current 4G and in particular the future 5G wireless.
RoF transmission system, which is based on optical subcarrier modulation, combines the advantages of both optical fiber and radio transmission, where the optical fiber has low loss, low cost, extremely high capacity, lightweight, and immunity to electromagnetic interference, and the radio transmission simplifies remote radio units (RRUs) at antenna towers. Furthermore, radio transmission based front-haul is transparent to RF signal frequency and wireless protocol, i.e., upgradable, in addition to simplified RRUs.
Unfortunately, RoF is an analog optical transmission, and it is well known that any analog transmission is susceptible to nonlinear distortion. To be more specific, nonlinear distortion is the major limit for RoF transmission. In fact, all inline functional optical and electrical components used in RoF transmission systems may induce the nonlinear distortion. Specifically in RoF based front-haul systems, two key functions, i.e., RF power amplification and optical subcarrier modulation, are the main factors in introducing nonlinear distortions. The nonlinear distortions from RF power amplifiers (PAs) have been studied for decades. Therefore, the nonlinear distortions from the optical subcarrier modulation are the main concern in this thesis. The nonlinear distortions include harmonic distortions (HDs) and intermodulation distortions (IMDs). For narrow band RF signals, the HDs can be suppressed by RF filtering, but it may be impossible for the IMDs to be filtered out. For broadband RF signals, both HDs and IMDs could fall in the passband of RF signals and introduce crosstalk, and therefore both of them are required to be suppressed, i.e., linearization required.
In the past decades, linearization for RF PAs has been investigated extensively, mainly focusing on signal processing based linearization, i.e., digital linearization. Unfortunately, the digital linearization is typically limited to the RF signals with up to 20 MHz bandwidth. Based on the current technologies of signal processing hardware, linearization for 1 GHz RF signals can be done, but the complexity and cost are beyond the practical applications. In order to explore broadband RoF transmission systems that support broadband front-haul, simple, low cost, and broadband linearization is pivotal.
In this thesis, two linearization technologies for RoF transmission systems are investigated comprehensively, i.e., analog predistortion circuit (PDC) and dual wavelength optical linearization. Two novel PDCs are designed and investigated to suppress 3rd order IMD (IMD3) of RoF transmission systems. The PDCs have the advantages of broad bandwidth, compact size, and low cost. The first PDC is designed to have a bandwidth from 7 to 18 GHz, using two zero-bias Gallium Arsenide (GaAs) Schottky diodes as predistorter. The linearization using this PDC is verified in externally modulated RoF transmission systems. When a Mach-Zehnder modulator (MZM) is used for the optical subcarrier modulation, the input power at 1 dB compression point (P1dB) of the RoF transmission system is improved by 0.4 and up to 2.2 dB from 7 to 18 GHz. The spurious-free dynamic range (SFDR) is improved by more than ~10 dB from 7 to 14 GHz and ~6 dB from 15 to 18 GHz. When an electro-absorption modulator (EAM) is used, the input P1dB is improved by 0.8 and up to 3.8 dB from 8 to 17 GHz. The SFDR is improved by more than ~9 dB from 7 to 14 GHz and ~4 dB from 15 to 18 GHz.
The second PDC is designed to have an ultra broad bandwidth from 10 MHz to 30 GHz, using a dual Schottky diode as the predistorter. The linearization using this PDC is investigated in both directly and externally modulated RoF transmission systems. The SFDR at 8 GHz is improved by 11.9 dB for a directly modulated RoF transmission. The SFDR is improved by more than 10 dB from 1 to 5 GHz and more than 5 dB from 1 to 30 GHz for an externally EAM modulated RoF transmission. Similarly, the SFDR is improved by more than 12 dB from 2 to 5 GHz and more than 5 dB from 2 to 30 GHz for an externally MZM modulated RoF transmission. When WiFi signals are transmitted over the externally modulated RoF systems for back-to-back (BTB) and 20 km single mode fiber (SMF), the error vector magnitudes (EVMs) are improved by 0.4 and up to 5.1 dB by using the PDC.
Dual wavelength linearization (DWL) technique is investigated compressively to suppress 2nd and 3rd order nonlinearities of externally modulated RoF transmission systems simultaneously, including HDs and IMDs. The linearization is verified in both EAM and MZM modulated RoF transmission systems. Theoretical analysis is given for the first time to understand DWL technique. The experimental results agree with the theoretical analyses. In the externally EAM modulated RoF transmission systems, when the 2nd order nonlinearity is maximally suppressed, 11.5 and 1.8 dB improvements of the SFDRs with respect to HD2 and HD3 respectively are achieved by using DWL simultaneously. 8.5 and 1.3 dB improvements of the SFDRs with respect to IMD2 and IMD3 respectively are also achieved. Correspondingly, 3 and 4 dB improvements of the input and output P1dBs respectively are obtained. When the 3rd order nonlinearity is maximally suppressed, the SFDRs with respect to HD3 and IMD3 are improved by 8.1 and 20.4 dB, respectively, and corresponding 7.7 and 11.7 dB improvements of the input and output P1dBs respectively are achieved. Furthermore, IMD5 is also suppressed, and the SFDR5 with respect to IMD5 is improved by 7.1 dB. Moreover, the RoF transmission of WiFi signals at 2.4 and 5 GHz are also linearized by using DWL technique. 3.5 dB at 2.4 GHz and 2.8 dB at 5 GHz improvements of the EVMs are obtained.
For an externally MZM modulated RoF transmission system, DWL is also investigated theoretically and experimentally. In the system, it is found that the SFDRs with respect to HD2 and HD3 are both improved at the same time when the even order nonlinearities are suppressed, in which the power of the RF signal and 3rd order nonlinearity is increased by the same level. Thus, the SFDR3 is still improved even the 3rd order nonlinearity is increased. Compared to using a single 1553 nm laser, the SFDRs with respect to HD2 and HD3 are improved by 38.4 and 12.1 dB.
| Divisions: | Concordia University > Gina Cody School of Engineering and Computer Science > Electrical and Computer Engineering |
|---|---|
| Item Type: | Thesis (PhD) |
| Authors: | Zhu, Ran |
| Institution: | Concordia University |
| Degree Name: | Ph. D. |
| Program: | Electrical and Computer Engineering |
| Date: | 28 August 2015 |
| Thesis Supervisor(s): | Zhang, Xiupu |
| ID Code: | 980493 |
| Deposited By: | RAN ZHU |
| Deposited On: | 28 Oct 2015 12:20 |
| Last Modified: | 18 Jan 2018 17:51 |
References:
[1] J. H. Winters, R. D. Gitlin, and S. Kasturia, “Reducing the effects of transmission impairments in digital fiber optic systems,” IEEE Commun. Mag., vol. 31, no. 6, pp. 68-76, Jun. 1993.[2] T. Terahara, T. Naito, N. Shimojoh, T. Chikarna and M. Suyama, “85 Gbit/s WDM transmission of 16 5.3 Gbit/s RZ data signals over 7931 km using accurate gain-equalisation and precompensation of group-velocity-dispersion,” Electron. Lett., vol.33, no. 7, pp. 603-605, Mar. 1997.
[3] R. A. de A. Lima, M. C. R. Carvalho, and L. F. M. Conrado, “Digital optical transmission links with in-line erbium doped fiber amplifier chains,” IEEE MTT-S Int. Microw. Symp., vol. 1, pp. 374-378, Aug. 1997.
[4] H. Asada, T. Yamada, N. A. Rabou, H. Ikeda, and Y. Shimodaira, “Optical fiber digital transmission of multiplexed video and audio signals suitable for multimedia applications,” IEEE Trans. Consum. Electron., vol. 44, no. 2, pp. 273-279, May 1998.
[5] R. E. Schuh, E. Sundberg, B. Verri, and T. Arkner, “Penalty free simultaneous 1 Gbit/s digital and GSM-1800 radio signal transmission over 600 m multimode fibre using 850 nm VCSEL sources,” IEEE Int. Symp. Pers. Indoor Mobile Radio Commun., vol. 5, pp. 2274-2276, Sept. 2002.
[6] J. Yu, X. Zhou, M. F. Huang, Y. Shao, D. Qian, T. Wang, M. Cvijetic, P. Magill, L. Nelson, M. Birk, S. Ten, H. B. Mathew, and S. K. Mishra, “17 Tb/s (161×114 Gb/s) PolMux-RZ-8PSK transmission over 662 km of ultra-low loss fiber using C-band EDFA amplification and digital coherent detection,” European Conf. Opt. Commun., Sept. 2008.
[7] D. van den Borne, V. A. J. M. Sleiffer, M. S. Alfiad, S. L. Jansen, and T. Wuth, “POLMUX-QPSK modulation and coherent detection: The challenge of long-haul 100G transmission,” European Conf. Opt. Commun., Sept. 2009.
[8] K.-I. Kitayama, A. Maruta, and Y. Yoshida, “Digital Coherent Technology for Optical Fiber and Radio-Over-fiber Transmission Systems,” J. Lightw. Technol., vol. 32, no. 20, pp.3411-3420, Mar. 2014.
[9] G. Raybon, A. Adamiecki, S. Randel, and P. J. Winzer, “Single-carrier and dual-carrier 400-Gb/s and 1.0-Tb/s transmission systems,” Opt. Fiber Commun. Conf. Expo., Mar. 2014.
[10] M. G. Larrode and A. M. J. Koonen, “All-Fiber Full-Duplex Multimode Wavelength-Division-Multiplexing Network for Radio-Over-Multimode-Fiber Distribution of Broadband Wireless Services,” IEEE Trans. Microw. Theory Techn., vol. 56, no. 1, pp. 248-255, Jan. 2008.
[11] N. Pleros, K. Vyrsokinos, K. Tsagkaris, and N. D. Tselikas, “A 60 GHz Radio-Over-Fiber Network Architecture for Seamless Communication With High Mobility,” J. Lightw. Technol., vol. 27, no. 12, pp. 1957-1967, May 2009.
[12] C.-T. Lin, J. Chen, P.-C. Peng, C.-F. Peng, W.-R. Peng, B.-S. Chiou, and S. Chi, “Hybrid Optical Access Network Integrating Fiber-to-the-Home and Radio-Over-Fiber Systems,” IEEE Photon. Technol. Lett., vol. 19, no. 8, pp. 610-612, Apr. 2007.
[13] G. Kalfas and N. Pleros, “An Agile and Medium-Transparent MAC Protocol for 60 GHz Radio-Over-Fiber Local Access Networks,” J. Lightw. Technol., vol. 28, no. 16, pp. 2315-2326, Mar. 2010.
[14] F. Brendel, J. Poette, B. Cabon, T. Zwick, F. Van Dijk, F. Lelarge, and A. Accard, “Chromatic Dispersion in 60 GHz Radio-Over-Fiber Networks Based on Mode-Locked Lasers,” J. Lightw. Technol., vol. 29, no. 24, pp. 3810-3816, Oct. 2011.
[15] T. P. C. de Andrade, N. L. S. da Fonseca, L. B. Oliveira, and O. C. Branquinho, “MAC protocols for wireless sensor networks over radio-over-fiber links,” IEEE Int. Conf. Commun., pp. 254-259, Jun. 2012.
[16] A. Haddad, E. A. Doumith, and M. Gagnaire, “Impairment-aware radio-over-fiber control plane for LTE antenna backhauling,” IEEE Int. Conf. Commun., pp. 2816-2821, Jun. 2012.
[17] Y. Yang, F. Li, C. Lim, and A. Nirmalathas, “Radio-over-fiber technologies for future mobile backhaul supporting cooperative base stations,” IEEE MTT-S Int. Microw. Symp., Jun. 2013.
[18] G. S. D. Gordon, M. J. Crisp, R. V. Penty, T. D. Wilkinson, and I. H. White, “Feasibility Demonstration of a Mode-Division Multiplexed MIMO-Enabled Radio-Over-Fiber Distributed Antenna System,” J. Lightw. Technol., vol. 32, no. 20, pp. 3521-3528, Mar. 2014.
[19] M. Morant, J. Prat, and R. Llorente, “Radio-Over-Fiber Optical Polarization-Multiplexed Networks for 3GPP Wireless Carrier-Aggregated MIMO Provision,” J. Lightw. Technol., vol. 32, no. 20, pp. 3721-3727, Apr. 2014.
[20] J. Park, W. V. Sorin, and K. Y. Lau, “Elimination of the fiber chromatic dispersion penalty on 1550 nm millimeter-wave optical transmission,” Electron. Lett., vol. 33, issue 6, pp. 512-513, Mar. 1997.
[21] G. H. Smith, D. Novak, and Z. Ahmed, “Overcoming chromatic-dispersion effects in fiber-wireless systems incorporating external modulators,” IEEE Trans. Microw. Theory Techn., vol. 45, issue 8, pp. 1410–1415, Aug. 1997.
[22] G. H. Smith, D. Novak, and Z. Ahmed, “Technique for optical SSB generation to overcome dispersion penalties in fiber-radio systems,” Electron. Lett., vol. 33, no. 1, pp. 74-75, Jan. 1997.
[23] A. Bjarklev, T. Rasmussen, O. Lumholt, K. Rottwitt, and M. Helmer, “Optimal design of single-cladded dispersion-compensating optical fibers,” Opt. Lett., vol. 19, issue 7, pp. 457–459, Apr. 1994.
[24] A. J. Antos and D. K. Smith, “Design and characterization of dispersion compensating fiber based on the LP01 mode,” J. Lightw. Technol., vol. 12, issue 10, pp. 1739–1745, Oct. 1994.
[25] K. Nishimura, R. Inohara, M. Tsurusawa, and M. Usami, “80 Gbit/s wavelength conversion using MQW electro-absorption modulator in delayed-interferometric configuration,” Electron. Lett., vol. 39, no. 10, pp. 792–794, May 2003.
[26] C. Sui, B. Hraimel, X. Zhang, L. Wu, Y. Shen, K. Wu, T. Liu, T. Xu and Q. Nie, “Impact of electro-absorption modulator integrated laser on MB-OFDM ultra-wideband signals over fiber systems,” J. Lightw. Technol., vol.28, no24. pp. 3548-3555, Nov. 2010.
[27] S. Højfeldt and J.Mørk, “Modeling of carrier dynamics in quantum-well electroabsorption modulators,” IEEE J. Sel. Topics in Quantum Electron., vol. 8, no. 6, pp. 1265-1276, Nov. 2002.
[28] T. Mori and H. Kawaguchi, “Characteristics of nondegenerate four-wave mixing in electro-absorption modulator,” Appl. Phys. Lett., vol. 85, no. 6, pp. 869–871, Aug. 2004.
[29] H. Kuwatsuka, T. Simoyama, and H. Ishikawa, “Enhancement of third-order nonlinear optical susceptibilities in compressively strained quantum wells under the population inversion condition,” IEEE J. Quantum Electron., vol. 35, no. 12, pp. 1817–1825, Dec. 1999.
[30] A. D’Ottavi, P. Spano, G. Hunziker, R. Paiella, R.Dall’Ara, G.Guekos, and K. J. Vahara, “Wavelength conversion at 10 Gb/s by four-wave mixing over a 30-nm interval,” IEEE Photon. Technol. Lett., vol. 10, no. 7, pp. 952–954, Jul. 1997.
[31] E. S. Awad, P. S. Cho, and J. Goldhar, “Simultaneous four-wave mixing and cross-absorption modulation inside a single EAM for high-speed optical demultiplexing and clock recovery,” IEEE Photon. Technol. Lett., vol. 17, no. 7, pp. 1534-1536, Jun. 2005.
[32] C. S. Park, C. K. Oh, C. G. Lee, D.-H. Kim, and C. S. Park, “A photonic up-converter for a WDM radio-over-fiber system using cross-absorption modulation in an EAM,” IEEE Photon. Technol. Lett., vol. 17, no. 9, pp. 1950-1952, Sept. 2005.
[33] C. S. Park, Y. Guo, Y. K. Yeo, Y. Wang, L. C. Ong, and S. Kato, “Fiber-Optic 60-GHz Wireless Downlink Using Cross-Absorption Modulation in an EAM,” IEEE Photon. Technol. Lett., vol. 20, no. 8, pp. 557-559, Apr. 2008.
[34] Q. Lin and G. P. Agrawal, “Vector theory of cross-phase modulation: role of nonlinear polarization rotation,” IEEE J. Quantum Electron., vol. 40, no. 7, pp. 958-964, Jul. 2004.
[35] G. Meloni, A. Bogoni, and L. Poti, “Real-time ps-resolution optical sampler based on XPM-induced polarization rotation in 1-meter-long bismuth oxide fibre,” European Conf. Opt. Commun., vol. 1, pp. 63-64, Sept. 2005.
[36] J. H. Lee, T. Nagashima, T. Hasegawa, S. Ohara, N. Sugimoto, and K. Kikuchi, “Wide-band tunable wavelength conversion of 10-gb/s nonreturn-to-zero signal using cross-phase-Modulation-induced polarization rotation in 1-m bismuth oxide-based nonlinear optical fiber,” IEEE Photon. Technol. Lett., vol. 18, no. 1, pp. 1041-1135, Jan. 2006.
[37] R. Zhu, B. Hraimel, and X. Zhang, “Analysis of simultaneous photonic frequency downconversion and optical subcarrier modulation in an electroabsorption modulator,” J. Lightw. Technol., vol. 30, no. 3, pp. 344–354, Feb. 2012.
[38] A. Georgiadis, “Gain, phase, imbalance, and phase noise effects on error vector magnitude,” IEEE Trans. Veh. Technol., vol. 53, no. 2, pp. 443-449, Mar. 2004.
[39] R. B. Ellis and M. H. Capstick, “Feedback control of a linearised Mach-Zehnder modulator for SCM applications,” High Freq. Postgraduate Student Colloq., pp. 33-38, Sept. 1996.
[40] G. C. Wilson, T. H. Wood, M. Gans, J. L. Zyskind, J. W. Sulhoff, J. E. Johnson, T. Tanbun-Ek, and P. A. Morton, “Predistortion of electroabsorption modulators for analog CATV systems at 1.55 μm,” J. Lightw. Technol., vol. 15, no. 9, pp. 1654-1662, Sept. 1997.
[41] H. Matsubara, K. Ishihara, N. Miyadai, and T. Nojima, “A Novel 3rd-and-5th-Order Predistortion Circuit for 2 GHz Band W-CDMA Amplifier,” Asia-Pacific Microw. Conf., Dec. 2007.
[42] A. Katz, R. Gray, and R. Dorval, “Truly wideband linearization,” IEEE Microw. Mag., vol. 10, no. 7, pp. 20-27, Dec. 2009.
[43] Y. Shen, B. Hraimel, X. Zhang, G. E. R. Cowan, K. Wu, and T. Liu, “A Novel Analog Broadband RF Predistortion Circuit to Linearize Electro-Absorption Modulators in Multiband OFDM Radio-Over-Fiber Systems,” IEEE Trans. Microw. Theory Techn., vol. 58, no. 11, pp. 3327-3335, Sept. 2010.
[44] B. Hraimel and X. Zhang, “Low-cost broadband predistortion-linearized single-drive x-cut Mach–Zehnder modulator for radio-over-fiber systems,” IEEE Photon. Technol. Lett., vol. 24, no. 18, pp. 1571–1573, Sept. 2012.
[45] B.-H. Son, K.-J. Kim, Y. Li, C.-I. Park, and Y.-W. Choi, “Simple electrical predistortion method using Schottky diode for radio-over-fiber systems,” IEEE Photon. Technol. Lett., vol. 27, no. 8, pp. 907–910, Apr. 2015.
[46] R. Sadhwani and B. Jalali, “Adaptive CMOS predistortion linearizer for fiber-optic links,” J. Lightw. Technol., vol. 21, no. 12, pp. 3180-3193, Dec. 2003.
[47] T.-Y. Huang, Y.-H. Lin, and H. Wang, “A K-band adaptive-bias power amplifier with enhanced linearizer using 0.18-μm CMOS process,” IEEE MTT-S Int. Microw. Symp., May 2015.
[48] Y.-H. Chen, K.-Y. Kao, C.-Y. Chao, and K.-Y. Lin, “A 24 GHz CMOS power amplifier with successive IM2 feed-forward IMD3 cancellation,” IEEE MTT-S Int. Microw. Symp., May 2015.
[49] L. Ding and G. T. Zhou, “Effects of even-order nonlinear terms on predistortion linearization,” IEEE Digit. Signal Process. Workshop, Oct. 2002.
[50] R. I. Killey, P. M. Watts, V. Mikhailov, M. Glick, and P. Bayvel, “Electronic dispersion compensation by signal predistortion using digital Processing and a dual-drive Mach-Zehnder Modulator,” IEEE Photon. Technol. Lett., vol. 17, no. 3, pp. 714-716, Mar. 2005.
[51] L. C. Vieira, N. J. Gomes, A. Nkansah, and F. Van Dijk, “Behavioral modeling of radio-over-fiber links using memory polynomials,” Int. Topical Meeting Microw. Photon., pp. 85-88, Oct. 2010.
[52] L. C. Vieira, N. J. Gomes, and A. Nkansah, “An experimental study on digital predistortion for radio-over-fiber links,” Asia Commun. Photon. Conf. Exhibition, pp. 126-127, Dec. 2010.
[53] Y. Zhao, X. Pang, L. Deng, X. Yu, X. Zheng, H. Zhang, and I. T. Monroy, “Digital predistortion of 75-110 GHz W-band frequency multiplier for fiber wireless short range access systems,” European Conf. Opt. Commun., Sept. 2011.
[54] Z. Liu, M. A. Violas, and N. B. Carvalho, “Transmission of four channels SCM over fiber and nonlinear compensation for RSOA external modulators,” IEEE GLOBECOM Workshops, pp. 147-151, Dec. 2011.
[55] A. Awoye, M. S. Leeson, and R. J. Green, “Neural network based adaptive predistortion for radio over fiber links,” Int. Conf. Transparent Opt. Netw., Jul. 2012.
[56] D. Lam, A. M. Fard, and B. Jalali, “Digital broadband linearization of analog optical links,” IEEE Photon. Conf., pp. 370-371, Sept. 2012.
[57] O. Omomukuyo, M. P. Thakur, and J. E. Mitchell, “Experimental demonstration of digital predistortion for linearization of Mach-Zehnder modulators in direct-detection MB-OFDM ultra-wideband over fiber systems,” Asia Commun. Photon. Conf., Nov. 2012.
[58] Y. Zhao, L. Deng, X. Pang, X. Yu, X. Zheng, H. Zhang, and I. T. Monroy, “Digital predistortion of 75-110 GHz W-band frequency multiplier for fiber wireless short range access systems,” Opt. Exp., vol. 19, no. 26, pp. B18-B25, Dec. 2012.
[59] Y. Pei, K. Xu, J. Li, A. Zhang, Y. Dai, Y. Ji, and J. Lin, “Complexity-reduced digital predistortion for subcarrier multiplexed radio over fiber systems transmitting sparse multi-band RF signals,” Opt. Exp., vol. 21, no. 3, pp. 3708-3714, Feb. 2013.
[60] Y. Zhang, J. Li, H. Chen, C. Yin, Y. Dai, F. Yin, and K. Xu, “Clip-and-Filter-Based Crest Factor Reduction and Digital Predistortion for WLAN-Over-Fiber Links,” IEEE Photon. Technol. Lett., vol. 26, no. 23, pp. 2315-2318, Sept. 2014.
[61] C. H. Lee, V. Postoyalko, and T. O’Farrell, “Enhanced performance of RoF link for cellular mobile systems using postdistortion compensation,” IEEE Int. Symp. Pers. Indoor Mobile Radio Commun., pp. 2772-2776, Sept. 2004.
[62] J. Basak and B. Jalali, “Photodetector linearization using adaptive electronic post-distortion,” Opt. Fiber Commun. Conf. Expo., Nat. Fiber Opt. Eng. Conf. (OFC/NFOEC), vol. 4, Mar. 2005.
[63] R. Duan, K. Xu, J. Dai, Q. Lv, Y. Dai, J. Wu, and J. Lin, “Digital linearization technique for IMD3 suppression in intersity-modulated analog optical links,” Int. Topical Meeting Microw. Photon., Asia Pacific Microw. Photon. (MWP/APMP), pp. 234-237, Oct. 2011.
[64] R. Duan, K. Xu, J. Dai, Y. Cui, J. Wu, Y. Li, Y. Dai, and J. Li, “Linearity improvement based on digital signal processing in intensity-modulated analog optical links incorporating photonic frequency downconversion,” Opt. Fiber Commun. Conf. Expo., Nat. Fiber Opt. Eng. Conf. (OFC/NFOEC), JW2A, Mar. 2012.
[65] P. Li, R. Shi, M. Chen, H Chen, S. Yang, and S. Xie, “Linearized photonic if downconversion of analog microwave signals based on balanced detection and digital signal post-processing,” Int. Topical Meeting Microw. Photon. (MWP), pp. 68-71, Sept. 2012.
[66] X. Xie, Y. Dai, K. Xu, J. Niu, Y. Li, R. Wang, Y. Ji, and J. Lin, “Digital nonlinearities compensation based on forward distortion information acquisition in channelized RF photonic links,” Int. Topical Meeting Microw. Photon. (MWP), pp. 88-91, Sept. 2012.
[67] Y. Pei, J. Li, K. Xu, Y. Dai, Y. Ji, and J. Lin, “Digital multi-channel post-linearization for uplink in multi-band radio-over-fiber systems,” Opt. Fiber Commun. Conf. Expo., Mar. 2014.
[68] C. Yu, A. Zhu, “Single feedback loop-based digital predistortion for linearizing concurrent multi-band transmitters,” IEEE MTT-S Int. Microw. Symp. (IMS), Jun. 2014.
[69] L. M. Johnson and H. V. Roussell, “Reduction of intermodulation distortion in interferometric optical modulators,” Opt. Lett., vol. 13, issue 10, pp. 928-930, 1988.
[70] L. M. Johnson and H. V. Roussell, “Linearization of an interferometer modulator at microwave frequencies by polarization mixing,” IEEE Photon. Technol. Lett., vol. 2, issue 11, pp. 810-811, Nov. 1990.
[71] B. M. Haas and T. E. Murphy, “A simple, linearized, phase-modulated analog optical transmission system,” IEEE Photon. Technol. Lett., vol. 19, no. 10, pp. 729-731, May. 2007.
[72] B. Masella, B. Hraimel, and X. Zhang, “Enhanced spurious-free dynamic range using mixed polarization in optical single sideband Mach-Zehnder modulator,” J. Lightw. Technol., vol. 27, no. 15, pp. 3034–3041, Aug. 2009.
[73] B. Hraimel, X. Zhang, W. Jiang, K. Wu, T. Liu, T. Xu, Q. Nie, and K. Xu, “Experimental demonstration of mixed-polarization to linearize electro-absorption modulators in radio-over-fiber links,” IEEE Photon. Technol. Lett., vol. 23, no. 4, pp. 230-232, Feb. 2011.
[74] B. Hraimel and X. Zhang, “Performance improvement of radio-over fiber links using mixed-polarization electro-absorption modulators,” IEEE Trans. Microw. Theory Techn., vol. 59, issue 12, pp. 3239–3248, Dec. 2011.
[75] B. Hraimel and X. Zhang, “Characterization and compensation of AM-AM and AM-PM distortion in mixed polarization radio over fiber systems,” IEEE MTT-S Int. Microw. Symp. Dig., Jun. 2012.
[76] B. Hraimel, X. Zhang, T. Liu, T. Xu, Q. Nie, and D. Shen, “Performance enhancement of an OFDM ultra-wideband transmission-over-fiber link using a linearized mixed-polarization single-drive x-cut Mach-Zehnder modulator,” IEEE Trans. Microw. Theory Techn., vol. 60, issue 10, pp. 3328–3338, Oct. 2012.
[77] X. Chen, W. Li, and J. Yao, “Microwave photonic link with improved dynamic range using a polarization modulator,” IEEE Photon. Technol. Lett., vol. 25, no. 14, pp. 1373-1376, Jun. 2013.
[78] Y. Cui, Y. Dai, F. Yin, J. Dai, K. Xu, J. Li, and J. Lin, “Intermodulation distortion suppression for intensity-modulated analog fiber-optic link incorporating optical carrier band processing,” Opt. Exp., vol. 21, no. 20, pp. 23433-23440, Oct. 2013.
[79] D. H. Jeon, H. D. Jung, and S. K. Han, “Mitigation of dispersion-induced effects using SOA in analog optical transmission,” IEEE Photon. Technol. Lett., vol. 14, issue 8, pp. 1166-1168, Aug. 2002.
[80] J. Palaci, J. Herrera, and J. Marti, “EAM-SOA based millimeter-wave frequency up-conversion for radio-over-fiber applications,” Int. Topical Meeting Microw. Photon. (MWP), Oct. 2009.
[81] B. Hraimel and X. Zhang, “Suppression of radio over fiber system nonlinearity using a semiconductor optical amplifier and mixed polarization,” Opt. Fiber Commun. Conf. Expo. Nat. Fiber Opt. Eng. Conf. (OFC/NFOEC), OTHR2, Mar. 2013.
[82] D. J. M. Sabido, IX, M. Tabara, T. K. Fong, C. L. Lu, and L. G. Kazovsky, “Improving the dynamic range of a coherent am analog optical link using a cascaded linearized modulator,” IEEE Photon. Technol. Lett., vol. 7, no. 7, pp. 813-815, Jul. 1995.
[83] W. K. Burns, “Linearized optical modulator with fifth order correction,” J. Lightw. Technol., vol. 13, no. 8, pp. 1724–1727, Aug. 1995.
[84] J. D. Farina, B. R. Higgins, and J. P. Farina, “New linearization technique for analog fiber-optic links,” Opt. Fiber Commun., pp. 283-285, Mar. 1996.
[85] G. E. Betts and F. J. O’Donnell, “Microwave analog optical links using suboctave linearized modulators,” IEEE Photon. Technol. Lett., vol. 8, no. 9, pp. 1273-1275, Sept. 1996.
[86] E. I. Ackerman, “Broad-band linearization of a Mach–Zehnder electrooptic modulator,” IEEE Trans. Microw. Theory Techn., vol. 47, no. 12, pp. 2271-2279, Dec. 1999.
[87] A. Karim and J. Devenport, “High dynamic range microwave photonic links for RF signal transport and RF-IF conversion,” J. Lightw. Technol., vol. 26, no. 15, pp. 2718–2724, Aug. 2008.
[88] D. Marpaung, C. Roeloffzen, and W. van Etten, “Push-pull modulated analog photonic link with enhanced SFDR,” Int. Topical Meeting Microw. Photon., Oct. 2009.
[89] V. R. Pagan, B. M. Haas, and T. E. Murphy, “Linearized electrooptic microwave downconversion using phase modulation and optical filtering,” Opt. Exp., vol. 19, no. 2, pp. 883-895, Jan. 2011.
[90] J. Dai, K. Xu, R. Duan, Y. Cui, J. Wu, and J. Lin, “Optical linearization for intensity-modulated analog links employing equivalent incoherent combination technique,” Int. Topical Meeting Microw. Photon., Asia Pacific Microw. Photon. (MWP/APMP), pp. 230-233, Oct. 2011.
[91] Y. Cui, K. Xu, J. Dai, X. Sun, Y. Dai, Y. Ji, and J. Lin, “Overcoming chromatic-dispersion-induced power fading in rof links employing parallel modulators,” IEEE Photon. Technol. Lett., vol. 24, no. 14, pp. 1173-1175, Apr. 2012.
[92] H. Zhang, S. Pan, M. Huang, and X. Chen, “Linear analog photonic link based on cascaded polarization modulators,” Asia Commun. Photon. Conf., Nov. 2012.
[93] F. Wei, S. Li, X. Zheng, H. Zhang, and B. Zhou, “Improvement of optically generated adjacent channel interference in RoF systems,” IEEE Photon. Technol. Lett., vol. 25, no. 12, pp. 1137-1140, May 2013.
[94] K. K. Loi, J. H. Hodiak, X. B. Mei, C. W. Tu, and W. S. C. Chang, “Linearization of 1.3-μm MQW electroabsorption modulators using an all-optical frequency-insensitive technique,” IEEE Photon. Technol. Lett., vol. 10, no. 7, pp. 964-966, Jul. 1998.
[95] B. M. Hass, V. J. Urick, J. D. McKinney, and T. E. Murphy, “Dual-wavelength linearization of optical-modulated analog microwave signals,” J. Lightw. Technol., vol. 26, no. 15, pp. 2748–2753, Aug. 2008.
[96] Z. Wu, K. Xu, J. Niu, Q. Lv, Y. Dai, and J. Lin, “Third-order intermodulation distortion improvement radio-over-fiber link using dual-wavelength intensity modulation,” High Speed Intell. Commun. Forum, May 2012.
[97] T. Iwai, K. Sato, and K. Suto, “Reduction of dispersion-induced distortion in SCM transmission systems by using predistortion-linearized MQW-EA modulators,” J. Lightwave Technol., vol. 15, issue 2, pp. 169–178, Feb. 1997.
[98] C. Lim, M. Attygalle, A. Nirmalathas, D. Novak, and R. Waterhouse, “Analysis of optical carrier-to-sideband ratio for improving transmission performance in fiber-radio links,” IEEE Trans. Microw. Theory Techn., vol. 54, no. 5, pp. 2181-2187, May 2006.
[99] C. Lim, A. Nirmalathas, K.-L. Lee, D. Novak, and R. Waterhouse, “Intermodulation distortion improvement for fiber–radio applications incorporating OSSB+C modulation in an optical integrated-access environment,” J. Lightw. Technol., vol. 25, no. 6, pp. 1602-1612, Jun. 2007.
[100] A. Ferreira, T. Silveira, D. Fonseca, R. Ribeiro, and P. Monteiro, “Highly linear integrated optical transmitter for subcarrier multiplexed systems,” IEEE Photon. Technol. Lett., vol. 21, no. 7, pp. 438-440, Feb. 2009.
[101] S. Li, X. Zheng, H. Zhang, and B. Zhou, “Highly linear radio-over-fiber system incorporating a single-drive dual-parallel Mach–Zehnder modulator,” IEEE Photon. Technol. Lett., vol. 22, no. 24, pp. 1775-1777, Sept. 2010.
[102] A. Agarwal, T. Banwell, P. Toliver, and T. K. Woodward, “Predistortion compensation of nonlinearities in channelized RF photonic links using a dual-port optical modulator,” IEEE Photon. Technol. Lett., vol. 23, no. 1, pp. 24-26, Nov. 2010.
[103] Q. Lv, K. Xu, Y. Dai, Y. Li, J. Wu, and J. Lin, “Nonlinear intermodulation distortion suppression in digital photonic link using polarization modulator,” Int. Topical Meeting Microw. Photon., Asia Pacific Microw. Photon. (MWP/APMP), pp. 262-265, Oct. 2011.
[104] G Zhang, S Li, X Zheng, H Zhang, B Zhou, and P Xiang, “Dynamic range improvement strategy for Mach-Zehnder modulators in microwave/millimeter-wave RoF links,” Opt. Exp., vol. 20, no. 15, pp. 17214-17219, Jul. 2012.
[105] W. Li and J. Yao, “Dynamic range improvement of a microwave photonic link based on bi-directional use of a polarization modulator in a Sagnac loop,” Opt. Exp., vol. 21, no. 13, pp. 15692-15697, Jul. 2013.
[106] Z. Chen, L. Yan, W. Pan, B. Luo, X. Zou, Y. Guo, H. Jiang, and T. Zhou, “SFDR enhancement in analog photonic links by simultaneous compensation for dispersion and nonlinearity,” Opt. Exp., vol. 21, no. 18, pp. 20999-21009, Aug. 2013.
[107] R. Zhu, X. Zhang, B. Hraimel, D. Shen, and T. Liu, “Broadband Predistortion Circuit Using Zero Bias Diodes for Radio over Fiber Systems,” IEEE Photon. Technol. Lett., vol. 25, no. 21, pp. 2101-2104, Nov. 2013.
[108] R. Zhu and X. Zhang, “Broadband Predistortion Circuit Design for Electro-Absorption Modulator in Radio over Fiber System,” Opt. Fiber Commun. Conf. Expo., Mar. 2014.
[109] R. Zhu, Z. Xuan, and X. Zhang, “Novel broadband analog predistortion circuit for radio-over-fiber systems,” IEEE MTT-S Int. Microw. Symp., May 2015.
[110] R. Zhu and X. Zhang, “Linearization of radio-over-fiber systems by using two lasers with different wavelengths,” IEEE MTT-S Int. Microw. Symp., Jun. 2014.
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