Multi-Channel Broadband Brillouin Slow Light With Multiple Longitudinal Mode Pump

Independent delay control of multi-channel signals based on stimulated Brillouin scattering slow light is proposed and demonstrated for the first time by using a multiple longitudinal mode fiber laser. Two independent broadband Brillouin pumps are generated by a fiber ring laser, which use a semiconductor optical amplifier as gain medium. The spectrum of each pump is comprised of a large number of longitudinal lasing modes, separated by 7 MHz and spanning a bandwidth of 11.6 and 11.2 GHz, respectively. The multi-channel broadband Brillouin slow light is demonstrated by using 8 Gb/s data signals. The signals in both channels are continuously delayed by as much as 80 ps at 21 dBm pump power, and the maximal delay-time with error free operation (bit error rate <; 10^-9) are up to 56.4 and 56 ps at 19 dBm pump power.