Increasing Splitting Ratio of Extended-Reach WDM/TDM-PON by Using Central Office Sited Automatic Gain Controlled SOAs

Masamichi FUJIWARA  Ryo KOMA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E100-B   No.8   pp.1388-1396
Publication Date: 2017/08/01
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2016EBP3268
Type of Manuscript: PAPER
Category: Fiber-Optic Transmission for Communications
Keyword: 
optical access system,  time division multiplexing (TDM),  wavelength division multiplexing (WDM),  long-reach passive optical network (PON),  high-splitting-ratio PON,  PON repeater,  semiconductor optical amplifier (SOA),  amplified spontaneous emission (ASE) noise,  automatic gain control (AGC),  

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Summary: 
To drastically increase the splitting ratio of extended-reach (40km span) time- and wavelength-division multiplexed passive optical networks (WDM/TDM-PONs), we modify the gain control scheme of our automatic gain controlled semiconductor optical amplifiers (AGC-SOAs) that were developed to support upstream transmission in long-reach systems. While the original AGC-SOAs are located outside the central office (CO) as repeaters, the new AGC-SOAs are located inside the CO and connected to each branch of an optical splitter in the CO. This arrangement has the potential to greatly reduce the costs of CO-sited equipment as they are shared by many more users if the new gain control scheme works properly even when the input optical powers are low. We develop a prototype and experimentally confirm its effectiveness in increasing the splitting ratio of extended-reach systems to 512.