Three-terminal optical signal amplifying device

Abstract

In the three-terminal optical signal amplifying device 10, a portion of the neighboring light LS at other wavelength than that of the first wavelength λ1 that is selected from the output light from the element 14 by the optical add drop filter 16, and the control light LC at the second wavelength λ2 input from the external are together input to the second semiconductor optical amplifying element 18. The output light including the output signal light LOUT at the second wavelength λ2 and the neighboring light at the neighboring wavelength to the second wavelength λ2 that is modulated and controlled by the control light LC in the cross gain modulation is output from the second semiconductor optical amplifying element 18. And the output signal light LOUT at the second wavelength λ2 passes through the wavelength selecting filter 20.

Description

[0001]This is a Division of application Ser. No. 11 / 632,718, which in turn is a National Stage of Application No. PCT / JP2005 / 003780, filed Mar. 4, 2005, which claims priority to Japanese Patent Application No. 2004-224726, filed Jul. 30, 2004. The disclosure of the prior applications are hereby incorporated by reference herein in their entirety.TECHNICAL FIELD[0002]The present invention relates to a three-terminal optical signal amplifying device suitable for optoelectronics such as optical communication, optical image processing, optical computation, optical measurement and optical integrated circuits, which are capable of advanced information processingBACKGROUND ART[0003]Actually, in optical communication, an optical signal that has been transmitted at a high speed is once converted into an electrical signal, which is subjected to data processing in an electronic circuitry, and the processed data signal is then reconverted into an optical signal to be transmitted. This incapabili...

AI Technical Summary

Benefits of technology

The device achieves stable and efficient optical signal amplification with reduced sensitivity to temperature changes and eliminates the need for multiple laser sources, simplifying the system and enhancing integration capabilities.

Problems solved by technology

Requiring a laser source in order to generate the second input light (bias light) at the second wavelength having the predetermined intensity that is input into the first semiconductor optical amplifying element together with the input light, causes the difficulty in integrating of the integrated circuit and small-sizing of the device.

Furthermore, requiring many laser sources upon using many three-terminal optical signal amplifying devices causes expensiveness and complexity in a system of optical circuitries.

Further, a change in the wavelength of the laser light causes such a disadvantage as an extensive change in its characteristics due to a change of the output from the first wavelength selecting element.

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