An improved technique for suppression of intrachannel four-wave mixing in 40-Gb/s optical transmission systems

作者：Batshon Hussam G^*; Djordjevic Ivan B; Vasic Bane V

来源：IEEE Photonics Technology Letters, 2007, 19(2-4): 67-69.

DOI：10.1109/LPT.2006.889109

• communication system nonlinearities
• forward-error correction (FEC)
• low-density parity-check (LDPC) codes
• modulation coding
• optical communications
• optical Kerr effect

This letter presents an efficient method for testing the efficiency of modulation techniques for countering the effects of intrachannel four-wave mixing by calculating the sum of all the contributors at a given resonance position (the position affected by the surrounding pulses). In addition to this method, we are proposing a modulation technique that shows a significant Q-factor improvement of up to 7.5 dB (depending on the number of spans and the phase sequence implemented) over the uncoded return-to-zero ON-OFF keying. Although the implementation of this phase modulation technique is simple, it is still very efficient in extending the nonlinearity tolerance and enhancing the performance of a high-speed optical transmission system.

• 出版日期2007-2