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Proceedings Paper

All-optical triode based on a tandem wavelength converter using cross-gain modulation in semiconductor optical amplifiers
Author(s): Yoshinobu Maeda
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Paper Abstract

An all-optical triode based on a tandem wavelength converter was realized in reflective InGaAsP-InP semiconductor optical amplifiers using the same 1551 nm wavelength for input, control and output. The output power ranged from 0 to 2 mW when the average control power was varied from 0 to 0.3 mW. Therefore, the output-input characteristics can be changed dynamically by low control powers. The output modulation degree was retained over a wide control power range of 0.01-1 mW. Because of its characteristics, this device can become a key component in future all-optical signal processing. In addition, a negative feedback optical amplification effect was confirmed using negative feedback based on cross-gain modulation in the all-optical triode. The optical amplification is capable of providing an output signal whose gain, waveform and baseline are stabilized without generating excessive noise. The amplification degree is retained at around 0 dB at an input power range of 0.01-1 mW and reaches -2 dB at 5 mW. The desired amplification can be adjusted by changing the amount of the negative feedback using the variable optical attenuator. The distortion of the waveform was extremely small in the wide frequency band of 0.1-10 GHz. The optical amplifier is physically considered as the optical equivalent of a non-inverting negative feedback amplifier and is capable of constituting an optical limiter.

Paper Details

Date Published: 15 September 2005
PDF: 8 pages
Proc. SPIE 5907, Photonic Devices and Algorithms for Computing VII, 59070R (15 September 2005); doi: 10.1117/12.614351
Show Author Affiliations
Yoshinobu Maeda, Toyota Technological Institute (Japan)


Published in SPIE Proceedings Vol. 5907:
Photonic Devices and Algorithms for Computing VII
Khan M. Iftekharuddin; Abdul A. S. Awwal, Editor(s)

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