光通信研究, 2017 (5): 1, 网络出版: 2017-10-30  

基于自零差检测的高速模式复用无源光网络

High Speed Mode-Division-Multiplexing Passive Optical Network Utilizing Self-Homodyne Detection
作者单位
1 北京邮电大学 电子工程学院,北京 100876
2 武汉电信器件有限公司,武汉 430205
摘要
为满足未来不断发展的接入网络业务需求,提出了一种基于自零差检测的高速模式复用无源光网络方案。在该方案中,少模光纤中的一个空间模式传送信号载波(即导频),其他空间模式用于传输信号。在接收端,导频和信号通过模式解复用器分离,导频作为接收端的本振与信号进行混频,实现自零差检测。借助于低串扰的少模光纤和模式复用/解复用器,接收端无需多入多出技术处理,即可实现导频与信号低串扰的分离。相比于偏振复用的自零差检测,基于模式复用的自零差检测可以有效地提高频谱效率。自零差检测可以有效地抑制激光器相位噪声,大大降低光线路终端或光网络单元对激光器线宽的要求。在接收端,由于不需要额外的本振,信号处理无需进行频偏的补偿,对载波相位恢复的要求也大大降低,从而有效降低了接收端数字信号处理的复杂度。利用该方案实验实现了4×40 Gbit/s 偏振复用正交频分复用信号经过55 km两模式少模光纤和模式复用解复用器后的无误码自零差检测。与背对背传输相比,55 km少模光纤引入的Q因子代价小于1 dB。
Abstract
To satisfy the demand of evolving network business in future access networks, a high speed Mode-Division-Multiplexing Passive Optical Network (MDM-PON) scheme utilizing self-homodyne detection is proposed. In the proposed scheme, one of the spatial modes is used to transmit a portion of signal carrier (namely pilot-tone) as the Local Oscillator (LO), while the others are used for signal-bearing channels. At the receiver, the pilot-tone and the signal are separated by mode demultiplexer and then sent to the receiver for coherent detection. Due to the low modal-crosstalk Few-Mode Fiber (FMF) and all-fiber mode multiplexer/demultiplexer (MUX/DEMUX), the pilot-tone and the signal can be effectively separated without Multiple-Input Multiple-Output (MIMO) processing. Compared with Polarization Division Multiplexing (PDM) self-homodyne detection, the spatial efficiency is enhanced. Meanwhile, the self-homodyne detection can effectively suppress the laser phase noise, which relax the requirement for lasers line-width at the Optical Line Terminal or Optical Network Units (OLT/ONUs). At the receiver side, the Digital Signal Processing (DSP) is also simplified since self-homodyne detection reduces the receiver complexity by eliminating the LO from the coherent receiver, removing the need for frequency offset compensation and reducing the requirement for carrier phase recovery by several orders of magnitude. Using the proposed scheme, a proof of concept 4×40 Gbit/s Orthogonal Frequency Division Multiplexing (OFDM) signal transmission over 55 km FMF using low modal-crosstalk two-mode FMF and MUX/DEMUX with error free operation is experimentally demonstrated. Compared with the back to back case, less than 1 dB Q -factor penalty is observed after transmission over 55-km FMF.

陈远祥, 余建国, 王任凡, 罗飚. 基于自零差检测的高速模式复用无源光网络[J]. 光通信研究, 2017, 43(5): 1. CHEN Yuan-xiang, YU Jian-guo, WANG Ren-fan, LUO Biao. High Speed Mode-Division-Multiplexing Passive Optical Network Utilizing Self-Homodyne Detection[J]. Study On Optical Communications, 2017, 43(5): 1.

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