US 2003/0118280 A1 · Optical Transmission system

Abstract

An optical transmission system comprises a light source to output an optical carrier having a predetermined wavelength, a photoelectric converter, an optical transmission line, an optical circulator to apply an output light from the light source to one end of the optical transmission line and to apply a light through the same end of the optical transmission line to the photoelectric converter, and an optical modulator disposed on the other end of the optical transmission line to return a portion of the light from the optical transmission line as a reference light to the optical transmission line without modulation and to modulate another portion of the light from the optical transmission line with a transmission signal to return it to the optical transmission line as a modulated light.

Claims20

Dependent claims

An optical transmission system comprising:

a light source to output an optical carrier having a predetermined wavelength;
a photoelectric converter;
an optical transmission line;
an optical circulator to apply an output light from the light source to one end of the optical transmission line and to apply a light through the same end of the optical transmission line to the photoelectric converter;
and
an optical modulator disposed on the other end of the optical transmission line to return a portion of the light from the optical transmission line as a reference light to the optical transmission line without modulation and to modulate another portion of the light from the optical transmission line with a transmission signal to return it to the optical transmission line as a modulated light.

3 more elements

An optical transmission system comprising:

a control station having a light source to generate an optical carrier;
a base station to communicate with a mobile terminal by wireless;
and
an optical transmission line to transmit a first signal light modulated with a down stream signal from the control station to the base station, to transmit the optical carrier from the control station to the base station, and to transmit a second signal light including the optical carrier modulated by the up stream signal from the base station to the control station,
the optical transmission system characterized in that;
the base station comprises an optical modulator to modulate a portion of the optical carrier with the up stream signal, and the second signal light comprises a non-modulated reflect light of the optical carrier as a reference light and a modulated light modulated by the optical modulator.

3 more elements

Dependencies are inferred from the claim text.

Optical Transmission system

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Optical Transmission system

Life of this patent

Abstract

Claims20