Mendinueta José Manuel D, Cao Bowen, Thomsen Benn C, Mitchell John E
Department of Electronic and Electrical Engineering, University College London (UCL), London, UK.
Opt Express. 2011 Dec 12;19(26):B229-34. doi: 10.1364/OE.19.00B229.
A centralized optical processing unit (COPU) that functions both as a wavelength converter (WC) and optical burst equaliser in a 10 Gb/s wavelength-converting optical access network is proposed and experimentally characterized. This COPU is designed to consolidate drifting wavelengths generated with an uncooled laser in the upstream direction into a stable wavelength channel for WDM backhaul transmission and to equalize the optical loud/soft burst power in order to relax the burst-mode receiver dynamic range requirement. The COPU consists of an optical power equaliser composed of two cascaded SOAs followed by a WC. Using an optical packet generator and a DC-coupled PIN-based digital burst-mode receiver, the COPU is characterized in terms of payload-BER for back-to-back and backhaul transmission distances of 22, 40, and 62 km. We show that there is a compromise between the receiver sensitivity and overload points that can be optimized tuning the WC operating point for a particular backhaul fiber transmission distance. Using the optimized settings, sensitivities of -30.94, -30.17, and -27.26 dBm with overloads of -9.3, -5, and >-5 dBm were demonstrated for backhaul transmission distances of 22, 40 and 62 km, respectively.
提出了一种集中式光处理单元（COPU），它在10 Gb/s波长转换光接入网络中既作为波长转换器（WC）又作为光突发均衡器，并进行了实验表征。该COPU旨在将上游方向由未冷却激光器产生的漂移波长合并到一个稳定的波长通道中，用于波分复用（WDM）回程传输，并均衡光突发的强/弱功率，以放宽突发模式接收机的动态范围要求。COPU由一个光功率均衡器组成，该均衡器由两个级联的半导体光放大器（SOA）后跟一个WC构成。使用光分组发生器和基于直流耦合PIN的数字突发模式接收机，对COPU在22、40和62 km的背对背和回程传输距离下的净荷误码率（payload-BER）进行了表征。我们表明，在接收机灵敏度和过载点之间存在一种折衷，可以通过针对特定回程光纤传输距离调整WC工作点来进行优化。使用优化设置，在22、40和62 km的回程传输距离下，分别展示了灵敏度为-30.94、-30.17和-27.26 dBm，过载分别为-9.3、-5和>-5 dBm的结果。
