Chirp limitation on high-speed wavelength conversion using semiconductor optical amplifiers

Summary form only given. The use of wavelength convertors in multiwavelength optical networks can enhance network flexibility. Cross-phase saturation effects in semiconductor optical amplifiers (SOAs) have been used in interferometric arrangements to achieve noninverted conversion with chirp compression and high extinction ratios. However, successful operation of such devices requires careful control of the drive conditions. Furthermore, their high-speed low-chirp operation, requiring large signal and cw powers, must avoid gain saturation, which counteracts the noninverted interferometric conversion. This paper considers the chirp introduced on conversion, employing crossgain saturation, and studies its dependence on amplifier drive current and signal power. It further shows how an increase in injected cw optical power can reduce chirp while improving conversion speed.