Semiconductor optical amplifier device amplifying an externally applied light signal, semiconductor optical amplification driving device and semiconductor light receiving apparatus

A semiconductor optical amplification driving device for amplifying a light signal comprising:

• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light;
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal;
• a filter extracting a predetermined frequency component of said electric signal;
• a preamplifier obtaining a difference between a current provided from said filter and a reference current, and adjusting an intensity;
• and
• a light source receiving a current provided from said preamplifier, and providing noise light corresponding to said current to said semiconductor optical amplifier device.

A semiconductor optical amplification driving device for amplifying a light signal comprising:

• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light;
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal;
• a feedback control circuit receiving said electric signal, and monitoring the state of said output light such that said light signal is stochastically synchronized with noise included in said light signal;
• a first current supply circuit supplying a first current to said optical amplification region according to a first control signal provided from said feedback control circuit;
• and
• a second current supply circuit supplying a second current to said saturable absorption region according to a second control signal provided from the feedback control circuit.

A semiconductor optical amplification driving device for amplifying a light signal comprising:

• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light;
• a photoelectric converter detecting a part of said injection light, and converting the detected part into an electric signal;
• a feedback control circuit receiving said electric signal, and monitoring the state of said injection light such that said light signal is stochastically synchronized with noise included in said light signal;
• a first current supply circuit supplying a first current to said optical amplification region according to a first control signal provided from said feedback control circuit;
• and
• a second current supply circuit supplying a second current to said saturable absorption region according to a second control signal provided from the feedback control circuit.

A semiconductor optical amplification driving device for amplifying a light signal comprising:

• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light;
• a first current supply circuit supplying a first current;
• a noise current supply circuit supplying a noise current stochastically synchronized with said light signal;
• a coupler coupling said first current to said noise current, and supplying the coupled currents to said optical amplification region;
• and
• a second current supply circuit supplying a second current to said saturable absorption region.

A semiconductor optical amplification driving device for amplifying a light signal comprising:

• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light;
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal;
• a filter extracting a predetermined frequency component of said electric signal;
• a preamplifier obtaining a difference between a current provided from said filter and a reference current, and adjusting an intensity;
• and
• a noise current supply circuit receiving a current provided from said preamplifier, and providing a noise current corresponding to said current to said active layer.

A semiconductor light receiving apparatus for amplifying and receiving a light signal, comprising:

• a semiconductor optical amplification driving device including:
• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light,
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal,
• a filter extracting a predetermined frequency component of said electric signal,
• a preamplifier obtaining a difference between a current provided from said filter and a reference current, and adjusting an intensity, and
• a light source receiving a current provided from said preamplifier, and providing noise light corresponding to said current to said semiconductor optical amplifier device;
• and
• a light receiver receiving a part or the whole of said output light.

A semiconductor light receiving apparatus for amplifying and receiving a light signal, comprising:

• a semiconductor optical amplification driving device including:
• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light,
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal,
• a feedback control circuit receiving said electric signal, and monitoring the state of said output light such that said light signal is stochastically synchronized with noise included in said light signal,
• a first current supply circuit supplying a first current to said optical amplification region according to a first control signal provided from said feedback control circuit, and
• a second current supply circuit supplying a second current to said saturable absorption region according to a second control signal provided from the feedback control circuit;
• and
• a light receiver receiving a part or the whole of said output light.

A semiconductor light receiving apparatus for amplifying and receiving a light signal, comprising:

• a semiconductor optical amplification driving device including:
• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light,
• a photoelectric converter detecting a part of said injection light, and converting the detected part into an electric signal,
• a feedback control circuit receiving said electric signal, and monitoring the state of said injection light such that said light signal is stochastically synchronized with noise included in said light signal,
• a first current supply circuit supplying a first current to said optical amplification region according to a first control signal provided from said feedback control circuit, and
• a second current supply circuit supplying a second current to said saturable absorption region according to a second control signal provided from the feedback control circuit;
• and
• a light receiver receiving a part or the whole of said output light.

A semiconductor light receiving apparatus for amplifying and receiving a light signal, comprising:

• a semiconductor optical amplification driving device including:
• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light,
• a first current supply circuit supplying a first current,
• a noise current supply circuit supplying a noise current stochastically synchronized with said light signal,
• a coupler coupling said first current to said noise current, and supplying the coupled currents to said optical amplification region, and
• a second current supply circuit supplying a second current to said saturable absorption region;
• and
• a light receiver receiving a part or the whole of said output light.

A semiconductor light receiving apparatus for amplifying and receiving a light signal, comprising:

• a semiconductor optical amplification driving device including:
• a semiconductor optical amplifier device provided with an active layer including an optical amplification region and a saturable absorption region, an electrode of a first polarity type, and an electrode of a second polarity type opposed to said electrode of the first polarity type, at least one of said electrodes of the first and second polarity types being divided for injecting a current into each of said optical amplification region and said saturable absorption region independently of the other, and said active layer receiving injection light including said light signal, and emitting output light produced by amplifying said injection light,
• a photoelectric converter detecting a part of said output light, and converting the detected part into an electric signal,
• a filter extracting a predetermined frequency component of said electric signal,
• a preamplifier obtaining a difference between a current provided from said filter and a reference current, and adjusting an intensity, and
• a noise current supply circuit receiving a current provided from said preamplifier, and providing a noise current corresponding to said current to said active layer;
• and
• a light receiver receiving a part or the whole of said output light.