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Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)

Polarisation independent spectral inversion without frequency shift in a semiconductor optical amplifier

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

Published Nov 15, 2004• 0 citations
Publisher

Abstract

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.

DOI
10.1109/cleoe.2003.1312372

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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.
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.
Tunable delays in semiconductor optical amplifiers are achieved via four wave mixing between a strong pump beam and a modulated probe beam. The delay of the probe beam can be controlled both electrically, by changing the SOA bias, and optically, by varying the pump power or the pump-probe detuning. For sinusoidal modulated signal at 0.5 GHz, a tunable delay of 1.6 ns is achieved. This corresponds to a RF phase change of 1.6 pi. For 1.3 ns optical pulses propagating through the SOA a delay of 0.59 ns is achieved corresponding to a delay-bandwidth product exceeding 0.45. For both the cases, slow light and superluminal light are observed as the pump-probe detuning is varied.