Title :
Performance analysis of wavelength converters based on cross-gain modulation in semiconductor-optical amplifiers
Author :
Obermann, Kristof ; Kindt, Stephan ; Breuer, Dirk ; Petermann, Klaus
Author_Institution :
Fachgebiet Hochfrequenztech., Tech. Univ. Berlin, Germany
fDate :
1/1/1998 12:00:00 AM
Abstract :
An analytical theory describing all-optical wavelength converters based on cross-gain modulation (XGM) in semiconductor-optical amplifiers is derived. Our theory consists of two parts: a large-signal analysis yielding the transmission function for the signal, and a small-signal analysis in order to describe the transformation of the signal and probe intensity noise. Both the large-signal as well as the small-signal theory reveal similar performance for the co- and the counterpropagating injection scheme for bit rates up to 2.5 Gb/s. This is confirmed by computer simulations. Consequently, the counterpropagating configuration is preferable because the implementation is simpler and conversion to the same wavelength is possible. In order to increase the conversion efficiency it is better to reduce the average signal power than to increase the probe power, which additionally reduces the output power range. However, there is a tradeoff between conversion efficiency and output extinction ratio. According to the small-signal analysis, the relative-intensity noise (RIN) due to the probe and due to the amplified spontaneous emission is negligible. Moreover, the converted signal has a lower RIN than the input signal
Keywords :
electro-optical modulation; laser noise; laser theory; optical frequency conversion; optical transmitters; performance evaluation; semiconductor device models; semiconductor device noise; semiconductor lasers; superradiance; wavelength division multiplexing; 2.5 Gbit/s; WDM; all-optical wavelength converters; amplified spontaneous emission; average signal power; conversion efficiency; copropagating injection scheme; counterpropagating injection scheme; cross-gain modulation; input signal; large-signal analysis; optical transmitters; output extinction ratio; performance analysis; power range; probe intensity noise; relative-intensity noise; semiconductor-optical amplifiers; signal intensity noise; small-signal analysis; transmission function; wavelength converters; Bit rate; Computer simulation; Extinction ratio; Performance analysis; Power generation; Probes; Semiconductor device noise; Semiconductor optical amplifiers; Signal analysis; Wavelength conversion;
Journal_Title :
Lightwave Technology, Journal of
