Title :
Fixed point precision requirements of the CMA for digital coherent access
Author :
Hou-Man Chin ; Millar, David S. ; Savory, Seb J.
Author_Institution :
Dept. of Electron. & Electr. Eng., Univ. Coll. London, London, UK
Abstract :
We investigate the bit precision required for the implementation of a fixed point constant modulus algorithm equalizer with least mean squares tap updating for coherent receivers. We demonstrate that for a 10Gbit/s PM-QPSK access system operating over 80km, with 7% and 20% FEC overheads, the benefit of increasing the resolution of the fixed point arithmetic saturates at 5 bits.
Keywords :
equalisers; fixed point arithmetic; forward error correction; multiplexing; optical receivers; quadrature phase shift keying; CMA; FEC overheads; PM-QPSK access system; bit precision; bit rate 10 Gbit/s; coherent receivers; digital coherent access; distance 80 km; fixed point constant modulus algorithm equalizer; fixed point precision requirements; forward error correction; least mean squares; polarization multiplexed quadrature phase shift keying; Bit error rate; Digital signal processing; Forward error correction; Multiplexing; Optical receivers; Signal processing algorithms;
Conference_Titel :
Photonics Conference (IPC), 2012 IEEE
Conference_Location :
Burlingame, CA
Print_ISBN :
978-1-4577-0731-5
DOI :
10.1109/IPCon.2012.6358688
