Optical receiving apparatus and method
AssigneeKDD Submarine Cable Systems Inc.
InventorsHidenori Taga, Koji Goto
Life of this patent
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Abstract
An optical receiving apparatus according to the present invention comprises an optical receiver for receiving a signal light input from an optical transmission line, a discriminator for discriminating an output signal of the optical receiver, an evaluator for evaluating transmission characteristics of the optical transmission line according to the received signal of the optical receiver, and a threshold controller for controlling the discrimination threshold of the discriminator according to the evaluated result of the evaluator.
Claims26
An optical receiving apparatus, comprising:
- a photodetector for converting a signal light input received from an optical transmission line to an electrical signal;
- a signal brancher for branching the electrical signal from the photodetector to a first electrical signal component and a second electrical signal component;
- a discriminator for discriminating the first electrical signal component;
- a clock extractor for extracting a clock having an amplitude from the second electrical signal component;
- and
- a threshold controller for controlling a discrimination threshold of the discriminator according to the amplitude of the extracted clock, wherein the discriminator discriminates the first electrical signal component according to the discrimination threshold controlled by the threshold controller.
An optical receiving apparatus, comprising:
- an optical signal brancher for branching a signal light input received from an optical transmission line to a first optical signal component and a second optical signal component;
- a first photodetector for converting the first optical signal component to a first electrical signal;
- a second photodetector for converting the second optical signal component to a second electrical signal;
- a discriminator for discriminating the first electrical signal;
- a clock extractor for extracting a clock having an amplitude from the second electrical signal;
- and
- a threshold controller for controlling a discrimination threshold of the discriminator according to the amplitude of the extracted clock, wherein the discriminator discriminates the first electrical signal according to the discrimination threshold controlled by the threshold controller.
An optical receiving apparatus, comprising:
- a signal brancher for branching an optical input signal received from an optical transmission line to a first signal component and a second signal component;
- a clock extractor for extracting a clock having an amplitude from the second signal component;
- and
- a discriminator for discriminating the first signal component;
- a threshold controller for controlling a discrimination threshold of the discriminator according to the amplitude of the extracted clock, wherein the threshold controller is preprogrammed with information to indicate a relation between the clock amplitude and an optimum threshold.
An optical receiving apparatus, comprising:
- a photodetector for converting an optical signal input from an optical transmission line to an electrical signal;
- a clock extractor for extracting a clock from the electrical signal;
- a threshold controller for determining a signal receiving discrimination threshold according to an amplitude of the extracted clock from the clock extractor;
- and
- a discriminator for discriminating the electrical signal according to the signal receiving discrimination threshold determined by the threshold controller.
An method for optical reception, comprising:
- converting an optical signal input from an optical transmission line to an electrical signal;
- extracting a clock from the electrical signal;
- determining a signal receiving discrimination threshold according to an amplitude of the clock;
- and
- discriminating the electrical signal according to the determined signal receiving discrimination threshold.
Dependencies are inferred from the claim text.