Remote Pumped All Optical Wavelength Converter for Metro-Core Photonic Networks

Ryota TSUJI  Daisuke HISANO  Ken MISHINA  Akihiro MARUTA  

Publication
IEICE TRANSACTIONS on Communications   Vol.E103-B   No.11   pp.1282-1290
Publication Date: 2020/11/01
Publicized: 2020/05/20
Online ISSN: 1745-1345
DOI: 10.1587/transcom.2019OBP0016
Type of Manuscript: Special Section PAPER (Joint Special Section on Opto-electronics and Communications for Future Optical Network)
Category: 
Keyword: 
wavelength conversion (WC),  all-optical signal processing,  four-wave mixing (FWM),  wavelength division multiplexing (WDM),  

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Summary: 
Wavelength division multiplexing (WDM) scheme is used widely in photonic metro-core networks. In a WDM network, wavelength continuity constraint is employed to simply construct relay nodes. This constraint reduces the wavelength usage efficiency of each link. To improve the same, an all-optical wavelength converter (AO-WC) has been attracting attention in recent years. In particular, an AO-WC is a key device because it enables simultaneous conversion of multiple wavelengths of signal lights to other wavelengths, independent of the modulation format. However, each AO-WC requires installation of multiple laser sources with narrow bandwidth because the lights emitted by the laser sources are used as pump lights when the wavelengths of the signal lights are converted by the four-wave mixing (FWM) process. To reduce the number of laser sources, we propose a remote pumped AO-WC, in which the laser sources of the pump lights are aggregated into several relay nodes. When the request for the wavelength conversion from the relay node without the laser source is conveyed, the relay node with the laser source transmits the pump light through the optical link. The proposed scheme enables reduction in the number of laser sources of the pump lights. Herein we analyze the distortion of the pump light by propagating it through the optical link We also evaluate the effect of the noise in optical amplifiers and nonlinearities in optical fibers using numerical simulations employing the representative parameters for a practical WDM network.