Ultrafast asynchronous all-optical signal processing is experimentally demonstrated. It is based on the intensity-dependent, self-frequency shift of a gigahertz Raman soliton. We demonstrate error-free, asynchronous, all-optical, bit-by-bit, self-signal recognition and demultiplexing from contended optical packets without use of an optical buffer, control pulse, or bit-phase synchronization. Fourfold, contended, 9.95-Gbit/s optical packets are transmitted through a conventional repeater span of 80 km and simultaneously demultiplexed to multiwavelength 9.95-Gbit/s optical packets with 0.5-dB processing sensitivity. Furthermore, we successfully accomplish demultiplexing from overlapping signals in contended optical packets with better than 3-dB recognition sensitivity. We confirm the capability of realizing a 3× cascade operation from bit-error-rate measurements.
© 2005 Optical Society of America
(060.7140) Fiber optics and optical communications : Ultrafast processes in fibers
(070.4340) Fourier optics and signal processing : Nonlinear optical signal processing
(070.6020) Fourier optics and signal processing : Continuous optical signal processing
Masao Kato, Kazuo Fujiura, and Takashi Kurihara, "Asynchronous, all-optical signal processing based on the self-frequency shift of a gigahertz Raman soliton," Appl. Opt. 44, 1442-1447 (2005)