Study of a novel high-speed all-optical orthogonal modulation scheme based on frequency-shift keying and intensity-modulated labeling

We propose and demonstrate a novel orthogonal optical la- beling scheme based on 40-Gbit/s optical frequency-shift keying FSK payload and 2.5-Gbit/s intensity-modulated IM labeling. Using the technology of carrier-suppressed modulation and conversion of differen- tial phase-shift keying to IM, only one light source is needed to generate the optical FSK signal. The system performance, including range of IM modulation depth, bit error ratio, and dispersion limitation, is carefully investigated by numerical simulation. With IM modulation depth of 0.4, the 40 Gbit/s FSK payload and 2.5-Gb/s IM label are transmitted over a 50-km standard single mode fiber SMF with 0.87 and 0.92 dB penalty and show immunity to input power range upto 11 and 15 dB, respec- tively. Optimal methods to improve the system performance are also proposed and discussed. After optimization, the IM modulation depth can be reduced to 0.2. © 2008 Society of Photo-Optical Instrumentation

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