基于光子干涉法的光载波对消的光干涉降噪方法

S. Kang, S. Jung, K. Mun, S. K. Han
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引用次数: 0

摘要

在相干光接入网中,需要考虑光纤链路的瑞利后向散射(RBS)和光上行接收端的跳动噪声(OBI)两种主要的光干扰噪声。当采用反射式调制器作为上行调制器时,由于单光纤环回系统的非均匀性,RBS噪声是一种非线性后向散射分量。当光载波功率较大时,该噪声的影响会更大,并且由于上行相干接收机的平方律检测,该载波诱导反射元件可以在本振处与光载波振荡。此外,在相同的接收原理下,OBI噪声是由于光信号载波到lo载波的振荡而产生的多余的振荡项。因此,活的光载波产生了两种噪声的OIN,使上行信号不可避免地受到阻碍。而且,随着光纤输入功率和传输距离的增加,OIN问题变得越来越严重,这是下一代无源光网络(PON)的重要要求。本文提出了一种新的基于光子干涉的光载波抵消技术,以减轻相干PON中多址的OIN。我们的目标是消除光网络单元(ONU)上的光载波,这是造成OIN的主要原因。该技术的基本原理是制造由两条光干涉路径组成的光子干涉,并通过两条光干涉路径之间180度的相位差产生相消干涉。考虑到直列式光学移相器的成本效益和易于偏压控制的优点,采用了直列式光学移相器。此外,在ONU采用可变光衰减器和简单的偏振控制,最大限度地减少了功率不平衡和两路极化状态的波动。此外,由于所提出的技术应用于上行信号调制后的ONU,因此调制格式的透明性成为可能。通过对该技术的实验验证,光载波被抵消了约30 dB,这种抵消有助于在整个上行信号频带上缓解OIN。在高光纤输入功率大于最低要求的光纤发射功率的严重oin诱导条件下,从本底噪声和眼型方面验证了显着的性能改进,作为概念验证。该技术具有低复杂度、低成本和上行信号调制格式透明等优点,对oin诱导上行传输具有良好的容忍度。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Photonic interferometry based optical carrier cancellation for optical interference noise reduction
In the coherent optical access network, two major optical interference noise (OIN) including Rayleigh back scattering (RBS) at fiber link and optical beating noise (OBI) at the uplink receiver need to considered. RBS noise is a nonlinearly back-scattered component due to non-uniformity in single-fiber loopback system when reflective-type modulator is used as an uplink modulator. Influence of this noise would be stronger for high power of the optical carrier and this carrier-induced reflecting component can beat with optical carrier at local oscillator (LO) due to square-law detection in uplink coherent receiver. In addition, OBI noise is unwanted beating term due to optical signal carrier-to-LO carrier beat by the same receiving principle. Thus, alive optical carrier causes OIN of both noises enabling to inevitable obstacles for uplink signal. Moreover, OIN becomes more severe as increasing fiber input power and transmission distance which are important requirements for the next generation passive optical network (PON). In this paper, a novel photonic interferometry-based optical carrier cancellation (OCC) technique is proposed to mitigate these OIN for multiple access in coherent PON. Our goal is to cancel out the optical carrier at optical network unit (ONU) which is main cause of OIN. Basic principle of the proposed technique is making a photonic interferometry consisted of two optical interferometric paths and generating a destructive interference through phase difference of 180 degrees between two paths. In-line optical phase shifter was used considering its advantages of cost-effectiveness and easy bias control properties. In addition, power imbalance and fluctuation of the state of polarization between two paths were minimized by using a variable optical attenuator and simple polarization control at ONU. Furthermore, transparency for modulation format was possible because the proposed technique is applied at ONU after uplink signal modulation. Through experimental demonstration for the proposed technique, optical carrier was cancelled out up to about 30 dB and this cancellation facilitates OIN mitigation at the overall uplink signal band. Under the severely OIN-induced condition of the high fiber input power more than minimally required fiber launch power, a remarkable performance improvement in terms of the noise floor and eye-pattern were verified as a proof of concept. The proposed technique shows a good tolerance to OIN-induced uplink transmission by taking advantages of the low-complexity, cost-effectiveness and transparency for modulation format of uplink signal.
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