Patent
Light transmitter and light transmission system
TLDR
In this paper, an automatic level control (ALC) processing is performed to suppress the light intensity fluctuation of wavelength light and an optical carrier is generated, which is then inputted to an optical modulator and modulated with data inputted through an amplifier.Abstract:
PROBLEM TO BE SOLVED: To suppress intense noise, to transmit a signal with narrow ASE (amplified natural discharge light) at a higher bit rate and to effectively use an optical band. SOLUTION: The natural discharge light of a wide band is emitted from a light source 21 and an optical filter 22 cuts specified wavelength light and inputs it in an optical modulator 23. A part of wavelength obtained in the optical filter 22 is extracted by an optical coupler 24 and a photodiode 25 measures the light intensity amplitude. The measured result is polarity-inverted in an inversion amplifier 27 and it is set to be the modulation input of an optical modulator 23. Thus, an ALC processing (automatic level control) is executed, the light intensity fluctuation of wavelength light is suppressed and an optical carrier is generated. The optical carrier is inputted to an optical modulator 26 and is modulated with data D inputted through an amplifier 28. Thus, an optical transmission signal is obtained. Thus, the intense noise of the optical carrier can be suppressed by ALC and the signal of the high bit rate can be transmitted with the considerably low bit error rate.read more
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