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针对光纤模分复用传输系统中模式耦合串扰问题, 设计并制备了一种新型少模光纤, 其较高的模式差分群延时保证各模式信道独立传输.在此基础上, 提出一种级联多输入多输出(MIMO)延时均衡算法, 进一步减少源于模式复用器和解复用器的模式串扰, 提高基于少模光纤的模分复用传输系统的传输距离和传输容量.与传统MIMO均衡算法相比, 级联MIMO延时均衡算法在没有显著增加计算复杂度的条件下, 能够应用于模式差分群延时很大的模分复用传输系统.对单信道传输速率为 40 Gbps的四相相移键控两模复用传输系统进行仿真, 经40 km少模光纤传输后, 采用级联MIMO均衡算法较普通MIMO均衡算法有1.7 dB的质量因子的提升. 仿真结果证明, 使用少模光纤和级联MIMO延时均衡算法能够有效地消除模分复用信号间的串扰, 有望在下一代大容量光纤传输系统中获得 推广应用.In order to solve the mode crosstalk in a mode division multiplexing (MDM) transmission system, we design and fabricate a novel few-mode fiber (FMF) with high mode differential group delay (MDGD) that ensure that all supporting modes can transmit through the FMF independently. Then, we propose a cascaded multi-input multi-output (MIMO) delay equalization method, in order to further suppress the mode crosstalk from the mode division multiplexer/demultiplexer (MUX/DeMUX) and improve the transmission distance and spectrum efficiency of MDM system. Our simulation results verify that the cascaded MIMO delay equalization method together with the novel FMF can effectively mitigate the mode crosstalk of MDM transmission. Compared with the traditional MIMO equalization method, our proposed equalization method can be successfully applied to the QPSK signal transmission through the FMF with large MDGD, while no obvious increase of computation complexity is observed. Our results show that for a 40 Gbps two-mode division multiplexing system, the Q factor can be improved by 1.7 dB after 40 km FMF transmission using the proposed cascaded MIMO equalization method. Therefore, all those results are very conducive to the next-generation high capacity fiber-optic transmission.
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Keywords:
- mode division multiplexing /
- few-mode fiber /
- mode differential group delay /
- multi-input multi-output equalization
[1] Tan Z W, Ning T G, Liu Y, Tong Z, Jian S S 2006 Chin. Phys. 15 1819
[2] Wang J, Wang Z L 2004 Chin. Phys. 13 877
[3] Zhang J Z, Wang A B, Wang Y C 2009 Acta Phys. Sin. 58 3793 (in Chinese) [张建忠, 王安帮, 王云才 2009 物理学报 58 3793]
[4] Chan F Y M, Lau A P T, Tam H Y 2012 Opt. Express 20 4548
[5] Al Amin A, Li A, Chen S, Chen X, Gao G, Shieh W 2011 Opt. Express 19 16672
[6] Lin Z, Zheng S W, Ren G B, Jian S S 2012 Acta Phys. Sin. 62 064214 (in Chinese) [林桢, 郑斯文, 任国斌, 简水生 2012 物理学报 62 064214]
[7] Love J D, Riesen N 2012 Opt. Lett. 37 3990
[8] Ryf R, Randel S, Gnauck A H, Bolle C, Sierra A, Mumtaz S, Esmaeelpour M, Burrows E C, Essiambre R J, Winzer P J, Peckham D W, McCurdy A H, Lingle R 2012 J. Lightwave Technol. 30 521
[9] Okamoto A, Soma D, Wakayama Y, Tomita A, Sato K, Grabar A A 2010 OptoElectronics and Communications Conference Saporo, 4 March, 2010 p302
[10] Hanzawa N, Saitoh K N, Sakamoto T, Matsui T, Tomita S, Koshiba M 2012 Optical Fiber Communication Conference Los Angeles, California, March 4, 2012 pOW1D.4
[11] Chen H S, van den Boom H P A, Koonen A M J 2011 Photonics Technol. Lett. 23 1283
[12] Olshansky R 1975 Appl. Opt. 14 935
[13] Salsi M, Koebele C, Sperti D, Tran P, Mardoyan H, Brindel P, Bigo S, Boutin A, Verluise F, Sillard P, Bigot-Astruc M, Provost L, Charlet G 2012 J. Lightwave Technol. 30 618
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[1] Tan Z W, Ning T G, Liu Y, Tong Z, Jian S S 2006 Chin. Phys. 15 1819
[2] Wang J, Wang Z L 2004 Chin. Phys. 13 877
[3] Zhang J Z, Wang A B, Wang Y C 2009 Acta Phys. Sin. 58 3793 (in Chinese) [张建忠, 王安帮, 王云才 2009 物理学报 58 3793]
[4] Chan F Y M, Lau A P T, Tam H Y 2012 Opt. Express 20 4548
[5] Al Amin A, Li A, Chen S, Chen X, Gao G, Shieh W 2011 Opt. Express 19 16672
[6] Lin Z, Zheng S W, Ren G B, Jian S S 2012 Acta Phys. Sin. 62 064214 (in Chinese) [林桢, 郑斯文, 任国斌, 简水生 2012 物理学报 62 064214]
[7] Love J D, Riesen N 2012 Opt. Lett. 37 3990
[8] Ryf R, Randel S, Gnauck A H, Bolle C, Sierra A, Mumtaz S, Esmaeelpour M, Burrows E C, Essiambre R J, Winzer P J, Peckham D W, McCurdy A H, Lingle R 2012 J. Lightwave Technol. 30 521
[9] Okamoto A, Soma D, Wakayama Y, Tomita A, Sato K, Grabar A A 2010 OptoElectronics and Communications Conference Saporo, 4 March, 2010 p302
[10] Hanzawa N, Saitoh K N, Sakamoto T, Matsui T, Tomita S, Koshiba M 2012 Optical Fiber Communication Conference Los Angeles, California, March 4, 2012 pOW1D.4
[11] Chen H S, van den Boom H P A, Koonen A M J 2011 Photonics Technol. Lett. 23 1283
[12] Olshansky R 1975 Appl. Opt. 14 935
[13] Salsi M, Koebele C, Sperti D, Tran P, Mardoyan H, Brindel P, Bigo S, Boutin A, Verluise F, Sillard P, Bigot-Astruc M, Provost L, Charlet G 2012 J. Lightwave Technol. 30 618
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