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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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