Pump Linewidth Requirements for Processing Dispersion-Altered DQPSK Signals using FWM

We report on a potentially deleterious issue regarding the four-wave mixing based processing of dispersion-altered signals. We estimate the baudrate-dependent pump linewidth tolerances by calculating the extra optical signal to noise ratio (OSNR) penalty with respect to the propagation distance. We...

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Bibliographic Details
Published in:arXiv.org 2015-08
Main Authors: Séan Ó Dúill, Naimi, Sepideh T, Barry, Liam P
Format: Article
Language:English
Subjects:
Converters
Four-wave mixing
Noise propagation
Optical communication
Packet switching
Quadrature phase shift keying
Signal processing
Signal to noise ratio
Tolerances
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Summary:We report on a potentially deleterious issue regarding the four-wave mixing based processing of dispersion-altered signals. We estimate the baudrate-dependent pump linewidth tolerances by calculating the extra optical signal to noise ratio (OSNR) penalty with respect to the propagation distance. We find that the issue is not important for 10 Gbaud differential quadrature phase shift keying (DQPSK) signals, though for 28 Gbaud (and 56 Gbaud) DQPSK signals we find that the pump linewidth requirements to implement FWM based optical signal processing needs to be in the sub-MHz range in order to avoid excessive OSNR penalties for the case of dispersion-altered signals. These results are pertinent for systems employing FWM, which could be all-optical wavelength converters for packet switching or mid-span spectral inversion techniques.
ISSN:2331-8422
DOI:10.48550/arxiv.1507.07379