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DUO-BINARY OPTICAL TRANSMISSION DEVICE USING A SEMICONDUCTOR OPTICAL AMPLIFIER, PARTICULARLY WITH REGARDS TO IMPROVING NONLINEAR AND DISPERSIVE PROPERTIES OF NRZ(NON RETURN TO ZERO) TRANSMISSION WITHOUT DEPENDING ON BIT PATTERNS AND TRANSMISSION QUALITY
DUO-BINARY OPTICAL TRANSMISSION DEVICE USING A SEMICONDUCTOR OPTICAL AMPLIFIER, PARTICULARLY WITH REGARDS TO IMPROVING NONLINEAR AND DISPERSIVE PROPERTIES OF NRZ(NON RETURN TO ZERO) TRANSMISSION WITHOUT DEPENDING ON BIT PATTERNS AND TRANSMISSION QUALITY
PURPOSE: A duo-binary optical transmission device using an SOA(Semiconductor Optical Amplifier) is provided to realize crossed phase properties of duo-binary signals by using an SOA and an optical band pass filter without using an electric low band pass filter, thereby overcoming restrictions on transmission quality while realizing high speed and high density. CONSTITUTION: A duo-binary optical transmission device(100) comprises as follows. A light source(101) outputs a carrier. A signal generator(102) generates an NRZ(Non Return to Zero) data signal. A coding device(103) codes the NRZ data signal. An interference-type SOA(110) modulates a phase of the optical carrier by a gain change in accordance with a bias current applied in combination with the coded signal. An optical band pass filter(105) receives the phase-modulated optical signal to filter the signal according to a determined band, and outputs a duo-binary optical signal. A driving amplifier(104) amplifies the coded signal to output the amplified signal.
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