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Overcoming optical amplifier intermodulation distortion using coding in multichannel communications systems

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2 Author(s)
G. J. Foschini ; AT&T Bell Lab., Holmdel, NJ, USA ; A. A. M. Saleh

In future optical networks on frequency division multiple access (FDMA), e.g. TV distribution, optical amplifiers will be required to assure adequate reception. A key figure of merit is η, the efficiency with which channels can be packed into a given bandwidth relative to the ideal packing of 100% corresponding to abutting channels (channel spacing=channel bandwidth). Packing can be severely limited by intermodulation distortion due to inherent amplifier nonlinearity. Assuming constant envelope signaling, the authors use a recently developed amplifier model to show that, by employing practical coding methods, η can be greatly increased. A simple, general algebraic formula for η is derived in terms of amplifier, receiver, and code parameters. For illustrative purposes the authors consider the packing of 50-Mb/s channels into a 1-THz optical bandwidth, assuming typical amplifier and receiver parameters

Published in:

IEEE Transactions on Communications  (Volume:38 ,  Issue: 2 )