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US 2011/0211830 A1Published application
Optical communication apparatus and optical add/drop apparatus
AssigneeFujitsu Limited
InventorsHideyuki MIYATA, Hiroshi Onaka
Life of this patent
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Abstract
An apparatus comprising an optical modulator modulating a light in accordance with a modulation signal and an operating point of the optical modulator, to thereby output a modulated optical signal; and a controller controlling the operating point in accordance with a branched portion of the modulated optical signal and a detected intensity of the modulation signal so that the operating point is kept stable when the detected intensity falls below a predetermined value.
Claims9
An optical communication apparatus comprising:
- an optical modulating unit modulating input light in accordance with a modulation signal to be transmitted;
- an optical attenuating unit transmitting or attenuating input light;
- an optical branching unit branching input light into first and second branched input lights;
- an optical detecting unit detecting a light intensity of the second branched input light;
- and
- an attenuating amount controlling unit controlling said optical attenuating unit to transmit the input light when the detected light intensity exceeds a predetermined value and controlling said optical attenuating unit to attenuate the input light further when the detected light intensity becomes equal to or lower than a predetermined value from a predetermined value,
- wherein the first branched input light is either a case of being outputted to an output port via said optical attenuating unit and said optical modulating unit or a case of being outputted to said output port via said optical modulating unit and said optical attenuating unit.
4 more elements
An optical communication apparatus comprising:
- an optical branching unit branching input light entered to an input port into first and second branched input lights;
- an optical modulating unit modulating the first branched input light in accordance with a modulation signal to be transmitted, to thereby output a modulated optical signal to an output port;
- an optical detecting unit detecting a light intensity of the second branched input light;
- and
- a modulation controlling unit controlling an operating point of said optical modulating unit so that said optical modulating unit attenuates the first branched input light to a predetermined intensity when said detected light intensity becomes equal to or lower than a predetermined value.
2 more elements
An optical communication apparatus comprising:
- an optical modulating unit modulating input light in accordance with a modulation signal to be transmitted;
- an optical attenuating unit transmitting, attenuating or blocking input light;
- a modulation signal detecting unit detecting a signal intensity of said modulation signal;
- and
- an attenuating amount controlling unit controlling said optical attenuating unit to attenuate the input light to a predetermined intensity when the detected signal intensity becomes equal to or lower than a predetermined value,
- wherein input light entered to an input port is either a case of being outputted to an output port via said optical attenuating unit and said optical modulating unit or a case of being outputted to said output port via said optical modulating unit and said optical attenuating unit.
3 more elements
An optical communication apparatus comprising:
- an optical modulating unit modulating input light entered to an input port in accordance with a modulation signal to be transmitted, and thereby outputting a modulated optical signal to an output port;
- a modulation signal detecting unit detecting a signal intensity of said modulation signal;
- and
- a modulation controlling unit controlling said optical modulating unit to attenuate the input light to a predetermined intensity when the detected signal intensity becomes equal to or lower than a predetermined value.
1 more element
An optical branching/inserting apparatus comprising:
- a branching/inserting unit connected to a transmission path which transmits a wavelength-multiplexed optical signal, said branching/inserting unit capable of branching and inserting an optical signal with at least one wavelength with respect to an optical signal on said transmission path;
- an optical wavelength branching unit processing reception of an optical signal branched by said branching/inserting unit for every wavelength;
- and
- an optical inserting unit outputting insertion light to be inserted to an optical signal on said transmission path to said branching/inserting unit, wherein said optical inserting unit comprises:
- an optical modulating unit modulating input light entered to an input port in accordance with a modulation signal to be transmitted, to thereby output a modulated optical signal,
- an optical branching unit branching the modulated optical signal into first and second branched optical signals, and outputting the first branched optical signal to an output port,
- an operating point controlling unit controlling said optical modulating unit in accordance with the second branched optical signal,
- a modulation signal detecting unit detecting a signal intensity of said modulation signal, and
- a controlling unit maintaining an operating point of said operating point controlling unit when the detected signal intensity is equal to or lower than a predetermined value, and controlling an operation of said operating point controlling unit from a maintained operating point when the detected signal intensity becomes higher than the predetermined value from a value equal to or lower than the predetermined value.
6 more elements
An optical branching/inserting apparatus comprising:
- a branching/inserting unit connected to a transmission path which transmits a wavelength-multiplexed optical signal, said branching/inserting unit capable of branching and inserting an optical signal with at least one wavelength with respect to an optical signal on said transmission path;
- an optical wavelength branching unit processing reception of an optical signal branched by said branching/inserting unit for every wavelength;
- and
- an optical inserting unit outputting insertion light to be inserted to an optical signal on said transmission path to said branching/inserting unit, wherein said optical inserting unit comprises:
- an optical modulating unit modulating input light in accordance with a modulation signal to be transmitted,
- an optical attenuating unit transmitting or attenuating input light,
- an optical branching unit branching input light into first and second branched input lights,
- an optical detecting unit detecting a light intensity of the second branched input light, and
- an attenuating amount controlling unit controlling said optical attenuating unit to transmit the input light when the detected light intensity exceeds a predetermined value and controlling said optical attenuating unit to attenuate the input light further when the detected light intensity becomes equal to or lower than a predetermined value from a predetermined value,
- wherein the first branched input light is either a case of being outputted to an output port via said optical attenuating unit and said optical modulating unit or a case of being outputted to said output port via said optical modulating unit and said optical attenuating unit.
7 more elements
An optical branching/inserting apparatus comprising:
- a branching/inserting unit connected to a transmission path which transmits a wavelength-multiplexed optical signal, said branching/inserting unit capable of branching and inserting an optical signal with at least one wavelength with respect to an optical signal on said transmission path;
- an optical wavelength branching unit processing reception of an optical signal branched by said branching/inserting unit for every wavelength;
- and
- an optical inserting unit outputting insertion light to be inserted to an optical signal on said transmission path to said branching/inserting unit, wherein said optical inserting unit comprises:
- an optical branching unit branching input light entered to an input port into first and second branched input lights,
- an optical modulating unit modulating the first branched input light in accordance with a modulation signal to be transmitted, to thereby output a modulated optical signal to an output port,
- an optical detecting unit detecting a light intensity of the second branched input light, and
- a modulation controlling unit controlling an operating point of said optical modulating unit so that said optical modulating unit attenuates the first branched input light to a predetermined intensity when said detected light intensity becomes equal to or lower than a predetermined value.
5 more elements
An optical branching/inserting apparatus comprising:
- a branching/inserting unit connected to a transmission path which transmits a wavelength-multiplexed optical signal, said branching/inserting unit capable of branching and inserting an optical signal with at least one wavelength with respect to an optical signal on said transmission path;
- an optical wavelength branching unit processing reception of an optical signal branched by said branching/inserting unit for every wavelength;
- and
- an optical inserting unit outputting insertion light to be inserted to an optical signal on said transmission path to said branching/inserting unit, wherein said optical inserting unit comprises:
- an optical modulating unit modulating input light in accordance with a modulation signal to be transmitted,
- an optical attenuating unit transmitting, attenuating or blocking input light,
- a modulation signal detecting unit detecting a signal intensity of said modulation signal, and
- an attenuating amount controlling unit controlling said optical attenuating unit to attenuate the input light to a predetermined intensity when the detected signal intensity becomes equal to or lower than a predetermined value,
- wherein input light entered to an input port is either a case of being outputted to an output port via said optical attenuating unit and said optical modulating unit or a case of being outputted to said output port via said optical modulating unit and said optical attenuating unit
6 more elements
An optical branching/inserting apparatus comprising:
- a branching/inserting unit connected to a transmission path which transmits a wavelength-multiplexed optical signal, said branching/inserting unit capable of branching and inserting an optical signal with at least one wavelength with respect to an optical signal on said transmission path;
- an optical wavelength branching unit processing reception of an optical signal branched by said branching/inserting unit for every wavelength;
- and
- an optical inserting unit outputting insertion light to be inserted to an optical signal on said transmission path to said branching/inserting unit, wherein said optical inserting unit comprises:
- an optical modulating unit modulating input light entered to an input port in accordance with a modulation signal to be transmitted, and thereby outputting a modulated optical signal to an output port,
- a modulation signal detecting unit detecting a signal intensity of said modulation signal, and
- a modulation controlling unit controlling said optical modulating unit to attenuate the input light to a predetermined intensity when the detected signal intensity becomes equal to or lower than a predetermined value.
4 more elements
Dependencies are inferred from the claim text.