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IEEE Journal of Quantum Electronics

Polarization-independent optical spectral inversion without frequency shift using a single semiconductor optical amplifier

Yanhua Hong, S. Bandyopadhyay, Paul S. J. Spencer, K.A. Shore

Published Sep 1, 2003• 7 citations
Publisher

Abstract

Two schemes for polarization-independent spectral inversion without frequency shift have been experimentally demonstrated. Both schemes use two pump beams and a polarization-insensitive semiconductor amplifier. Polarization-independent optical spectral inversion without frequency shift was obtained for lower wavelength detuning between the two pump beams in the first scheme and for large wavelength detuning in the second scheme. Combining these two schemes allows polarization-independent spectral inversion without frequency shift to be obtained over a quite wide frequency range. The results are in good qualitative agreement with theoretical predictions.

DOI
10.1109/jqe.2003.816095

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Two schemes for polarization-independent spectral inversion without frequency shift have been experimentally demonstrated. Both schemes use two pump beams and a polarization-insensitive semiconductor amplifier. Polarization-independent optical spectral inversion without frequency shift was obtained for lower wavelength detuning between the two pump beams in the first scheme and for large wavelength detuning in the second scheme. Combining these two schemes allows polarization-independent spectral inversion without frequency shift to be obtained over a quite wide frequency range. The results are in good qualitative agreement with theoretical predictions.
Two schemes for polarization-insensitive optical spectral inversion without frequency shift based on four-wave mixing are proposed, both utilizing a conventional semiconductor optical amplifier (SOA) and two pump waves. The significant advantages of the configurations include their simplicity, effective suppression of the signal and one of the pump waves and a reduction in the noise associated with these polarizations. In addition, the schemes offer broad operating parameter ranges from narrow frequency detunings using short devices in one proposed configuration (type I) and wide frequency detunings using long devices in a second configuration (type II). A specific feature of the second scheme is that polarization-sensitive SOAs can be utilized without compromising the operating characteristics.
This paper describes an experimental study of two schemes for polarisation independent spectral inversion without frequency shift in a semiconductor amplifier. It has been found that conjugate beam from the front facet of the SOA is polarisation insensitive when the frequency detuning between the two pump beams is less than 200 GHz and a polarisation insensitive conjugate beam without frequency shift is obtained when the frequency detuning between the two pumps is larger than 180 GHz. The experimental results has been found to be in good qualitative agreement with the theoretical predictions.
Switching of a signal beam by another control beam at different wavelength is demonstrated experimentally using the optical bistability occurring in a 1.55 mm-distributed feedback semiconductor optical amplifier (DFBSOA) working in reflection. Counterclockwise (S-shaped) and reverse (clockwise) bistability are observed in the output of the control and the signal beam respectively, as the power of the input control signal is increased. With this technique an optical signal can be set in either of the optical input wavelengths by appropriate choice of the powers of the input signals. The switching properties of the DFBSOA are studied experimentally as the applied bias current is increased from below to above threshold and for different levels of optical power in the signal beam and different wavelength detunings between both input signals. Higher on-off extinction ratios, wider bistable loops and lower input power requirements for switching are obtained when the DFBSOA is operated slightly above its threshold value.