Optical transmission system and optical transmission device used

Details Optical transmission system and optical transmission device used Optical transmission system and optical transmission device used

1996-12-30

1998-12-15

Negash, Kinfe-Michael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359162, 359173, 359188, 359181, H04J 1402, H04B 1004

Patent

active

058503030

ABSTRACT:
A signal processing circuit 113 subjects a transmission signal outputted from a signal source 111 and a carrier outputted from a carrier generation circuit 112 to predetermined signal processing, to generate a modulation signal amplitude-modulated by the transmission signal and so adapted that its envelop on the high level side (or on the low level side) has a shape analogous to the waveform of the transmission signal and its envelope on the low level side (or on the high level side) is at an approximately constant level. A light source 114 converts the modulation signal into a light intensity modulation signal, and outputs the light intensity modulation signal to an optical coupler 120. The above-mentioned signal processing is performed by the signal processing circuit 113, whereby the spectrum distribution of the light signal outputted from the light source 114 is dispersed, and the peak value of light spectra is decreased. The peak value of beat noise produced after receiving is proportional to the peak value of the light spectra, whereby the peak value of the beat noise is also decreased.

REFERENCES:
patent: 4893300 (1990-01-01), Carlin et al.
patent: 5020049 (1991-05-01), Bodeep et al.
patent: 5351148 (1994-09-01), Maeda et al.
patent: 5596436 (1997-01-01), Sargis et al.
H. Yamamoto, et al., Proposal of Optical Beat Noise Reduction Technique using Unipolar Amplitude Modulation in Multi-Point Access Optical Network, The Electronic Information Communication Conference, Sep. 18-21, 1996.

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