微波光子学研究的进展

天线。智能天线是一种多天线技术，采用天线阵列形成可控的波束，指向并随时跟踪用户。它具有增加通信容量和速率、减少电磁干扰、减少手机和基站发射功率，并具有定位功能的优点；能减少多径衰落影响，获得更多的用户数或更高的数据率。

微波光子学的研究成果也广泛应用到智能交通，高速公路交通通信系统[19]和超高速列车通信系统中。基于ROF的交通通信系统能够支持快速的交接管理和动态带宽分配，在移动通信、车辆通信领域具有强大的竞争力。

4 结束语

过去30年中，微波光子学在理论、器件、关键技术和系统应用层面都取得了发展，某些应用已实现了实用化[20]。微波技术与光电子技术是推动信息技术进步的两大重要学科。微波技术发展至今，在通信、国防等诸多方面获得了卓越的成就；光电子技术尤其是光通信在近30年来具有生机蓬勃的新技术增长点，把通信系统的速度和容量提高到了前所未有的程度。两者的相互融合，必将对现代信息技术产生深远的影响。

作为一门新兴的交叉学科，微波光子学有着广泛的应用前景。除了在有线电视、ROF通信和雷达中的应用外，微波光子学未来可能的应用还包括广播、无线多媒体业务、高清视频流、吉比特无线局域网、个域网、光探测与测量和射电天文学等，并可期待在太赫兹技术、高灵敏度传感和量子密钥分配等领域获得进一步研究与发展。

5 参考文献

[1] JAGER D. Microwave photonics [M]//SMITH S D, NEALE R F. Optical Information Technology. Edinburgh, Germany: Springer, 1993:328-333.
[2] CAPMANY J, NOVAK D. Microwave photonics combines two worlds [J]. Nature Photonics, 2007, (6):319-330.
[3] BRAUN R P, GROSSKOPF G, ROHDE D, et al. Low-phase-noise millimeter-wave generation at 64 GHz and data transmission using optical sideband injection locking [J]. IEEE Photonics Technology Letters, 1998,10 (5):728-730.
[4] BORDONALI A C, WLTON C, SEEDS A J. High-performance phase locking of wide linewidth semiconductor lasers by combied use of optical injection locking and optical phase-lock loop [J]. Journal of Lightwave Technology, 1999, 17(2):328-342.
[5] CHOW J, TOWN G, EGGLETON B, et al. Multiwavelength generation in an erbium-doped fiber laser using in-fiber comb filters [J].IEEE Photonics Technology Letters,1996, 8(1):60-62.
[6] SUN J, DAI Y, ZHANG Y, et al. Stable dual-wavelength DFB fiber laser with separate resonant cavities and its application in tunable microwave generation [J] .IEEE Photonics Technology Letters, 2006,18(12):2587-2589.
[7] HEDEKYIST P O. Microwave harmonic frequency generation utilizing the properties of an optical phase modulator [J]. Journal of Lightwave Technology, 2004,22(3): 882-886.
[8] ZHANG J, CHEN H, CHEN M, et al. Photonic generation of a millimeter-wave signal based on sextuple-frequency multiplication [J]. Optics Letters, 2007,32(9):1020-1022.
[9] RENAUD C C, PONNAMPALAM L, POZZI F, et al. Photonically enabled communication systems beyond 1000 GHz [C]//Proceedings of International Topical Meeting on Microwave Photonics, Jointly held with the 2008 Asia-Pacific Microwave Photonics Conference(MWP’08/APMP’08), Sep 30-Oct 3,2008, GoldCoast, Australia.Piscataway, NY,USA:IEEE,2008:55-58.
[10] CHEN H, CHEN M, WANG T, et al. Methods for ultra-wideband pulse generation based on optical cross-polarization modulation [J].Journal of Lightwave Technology, 2008,26(15): 2492-2499.
[11] LAW K Y. Ultra-high frequency linear fiber optic systems [M]. Berlin, Germany: Springer, 2008.
[12] WANG Q, YAO J. Multitap photonic microwave filters with arbitrary positive and negative coefficients using a polarization modulator and an optical polarizer [J].IEEE Photonics Technology Letters, 2008,20(2):78-80.
[13] HAN Y, BOYRAZ O, JALALI B. Ultrawide-band photonic time stretch A/D converter employing phase diversity [J]. IEEE Transactions on Microwave Theory and Techniques, 2005,53(4): 1404-1408.
[14] YU J, HUANG M, QIAN D, et al. Centralized lightwave WDM-PON employing 16-QAM intensity modulated OFDM downstream and OOK modulated upstream signals [J]. IEEE Photonics Technology Letters, 2008, 20(18): 1545-1547.
[15] JIA Z, YU J, HUANG M F, et al. Testbed demonstration and analysis for delivering dual services simultaneously in a single radio-over-fiber access platform [C]//Proceedings of International Topical Meeting on Micriwave Photonics(MWP’07), Oct 3-5,2007, Victoria, Canada. Piscataway, NJ,USA: IEEE,2007:108-111.
[16] LI M, CHEN H, YIN F, et al. Demonstration of a bidirectional 60 GHz RoF system with remote down-conversion scheme based on OCS and FWM in SOA [C]//Proceedings of the Asia-Pacific Microwave Photonics Conference (APMP’09), Apr 22-24,2009 , Beijing, China.
[17] CHEN L, YU J, LU J, et al. A radio-over-fiber system with photonics generated OFDM signals and wavelength reuse for upstream data connection [C]//Proceedings of the Thirteenth IEEE Asia-Pacific Computer Systems Architecture Conference (ICAIT’08), Jul 28-31,2008,, Shenzhen, China.
[18] 周波. 微波光子学发展动态 [J]. 激光与红外, 2006, 36(2): 81-84.
[19] KIM H B, EMMELMANN M, RATHKE B, et al. A radio over fiber network architecture for road vehicle communication systems [C]//Proceedings of 61st Vehicular Technology Conference (VTC-Sprig’2006):Vol 5, May 30-Jun 1,2005, Stockholm, Sweden. Piscataway, NJ,USA: IEEE, 2005: 2920-2924.
[20] COX C H, ACKERMAN E I. Microwave photonics: Past, present and future [C]//Proceedings of International Topical Meeting on Microwave Photonics, Jointly held with the 2008 Asia-Pacific Microwave Photonics Conference(MWP’08/APMP’08), Sep 30-Oct 3,2008, GoldCoast, Australia.Piscataway, NY,USA:IEEE,2008:9-11.