WO2014155900A1 - 集積光源及び光出力制御方法 - Google Patents
集積光源及び光出力制御方法 Download PDFInfo
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- WO2014155900A1 WO2014155900A1 PCT/JP2014/000068 JP2014000068W WO2014155900A1 WO 2014155900 A1 WO2014155900 A1 WO 2014155900A1 JP 2014000068 W JP2014000068 W JP 2014000068W WO 2014155900 A1 WO2014155900 A1 WO 2014155900A1
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/31—Digital deflection, i.e. optical switching
- G02F1/313—Digital deflection, i.e. optical switching in an optical waveguide structure
- G02F1/3136—Digital deflection, i.e. optical switching in an optical waveguide structure of interferometric switch type
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/10—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type
- G02B6/12—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings of the optical waveguide type of the integrated circuit kind
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/31—Digital deflection, i.e. optical switching
- G02F1/313—Digital deflection, i.e. optical switching in an optical waveguide structure
- G02F1/3132—Digital deflection, i.e. optical switching in an optical waveguide structure of directional coupler type
- G02F1/3134—Digital deflection, i.e. optical switching in an optical waveguide structure of directional coupler type controlled by a high-frequency electromagnetic wave component in an electric waveguide structure
-
- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/29—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the position or the direction of light beams, i.e. deflection
- G02F1/31—Digital deflection, i.e. optical switching
- G02F1/313—Digital deflection, i.e. optical switching in an optical waveguide structure
- G02F1/3137—Digital deflection, i.e. optical switching in an optical waveguide structure with intersecting or branching waveguides, e.g. X-switches and Y-junctions
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
- G02B6/24—Coupling light guides
- G02B6/26—Optical coupling means
- G02B6/28—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals
- G02B6/293—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means
- G02B6/29346—Optical coupling means having data bus means, i.e. plural waveguides interconnected and providing an inherently bidirectional system by mixing and splitting signals with wavelength selective means operating by wave or beam interference
- G02B6/2935—Mach-Zehnder configuration, i.e. comprising separate splitting and combining means
Definitions
- the present invention relates to an integrated light source used in optical interconnection and optical communication and an optical output control method thereof.
- Patent Document 1 an example of an integrated light source formed on a silicon substrate is disclosed in Patent Document 1.
- a first heater provided in at least one of the first optical waveguide and the second optical waveguide between the first optical coupler and the second optical coupler, and a semiconductor laser optically coupled to the input end of the first optical waveguide
- an optical component in which the first to second optical waveguides, the first heater, and the semiconductor laser are integrated on the same substrate.
- Non-Patent Document 1 discloses a structure of a hybrid integrated light source in which a high-power laser diode array is mounted on a silicon wire waveguide platform.
- the integrated light source disclosed in Non-Patent Document 1 may be CW (Continuous Wave) light because the transmitter is an external modulation system, and the laser diode array can be a single electrode, and can be driven individually as in the past.
- the pitch of the laser diode array on the premise of optical fiber connection is 250 to 300 ⁇ m
- the pitch can be reduced to 1/10 or less.
- all channels may be driven at all times, but optical wiring is multiplexed to improve the reliability of optical wiring, and the frequency of use of each channel varies with time. There is. From the viewpoint of power consumption, it is desirable not to use power except when the channel is used.
- the present invention has been made in view of the above problems, and an object thereof is to provide an integrated light source capable of reducing power consumption.
- One aspect of the integrated light source according to the present invention includes: an optical circuit having at least one interference-type optical switch that outputs the optical signal from at least one output port based on optical signals input from a plurality of input terminals; A light emitting unit that outputs an optical signal having the same phase to the input end of the first optical signal, and the interference optical switch combines or branches the optical signals input via a plurality of optical waveguides.
- An optical coupler that outputs to the second output port, the optical signal is input from one end, the other end is connected to the optical coupler, the optical signal is input from one end, and the other end Is connected to the optical coupler and has a second optical waveguide having the same optical path length as the first optical waveguide, and is provided on the first optical waveguide, and the first optical waveguide is changed according to a control signal. Switch the phase difference of the transmitted optical signal With that and the phase shifter, a.
- one aspect of the optical output control method is an optical circuit having at least one interferometric optical switch that outputs the optical signal from at least one output port based on optical signals input from a plurality of input terminals.
- a light emitting unit that outputs optical signals having the same phase to the plurality of input terminals, and the interference optical switch couples or branches the optical signals input via the plurality of optical waveguides.
- the first and second output ports, the optical signal is input from one end, the first optical waveguide is connected to the optical coupler at the other end, and the optical signal is input from one end.
- a second optical waveguide having the other end connected to the optical coupler and having the same optical path length as the first optical waveguide, and the first optical waveguide provided on the first optical waveguide.
- the output of the optical signal in the light emitting unit is reduced in response to a decrease in the number of the output ports that output the optical signal.
- the integrated light source and the light output control method according to the present application can provide an integrated light source capable of reducing power consumption.
- 1 is a block diagram of an integrated light source according to a first embodiment.
- 3 is a graph showing output characteristics of the interference optical switch according to the first embodiment.
- 3 is a graph showing output characteristics of the light emitting unit according to the first embodiment.
- 4 is a table showing a relationship between the phase of a phase shifter and the intensity of an optical signal to be output in one interference type optical switch in the integrated light source according to the first exemplary embodiment;
- 6 is a table showing conditions for phase differences given to a phase shifter when optical signals having the same intensity are output from four output ports using four interference optical switches in the integrated light source according to the first embodiment;
- the integrated light source according to the first embodiment outputs an optical signal having twice the intensity of an optical signal input from two output ports using four interference optical switches, and is output from another output port.
- the integrated light source according to the first embodiment outputs an optical signal having four times the intensity of an optical signal input from one output port using four interference optical switches, and is output from another output port.
- 5 is a table showing the conditions of phase difference given to the phase shifter when blocking an optical signal.
- FIG. 1 is a block diagram showing an integrated light source 1 in the present embodiment.
- the integrated light source 1 includes a light emitting unit (for example, a laser diode array 2), an optical circuit 3, and a control circuit 4.
- the laser diode array 2 has a multi-channel laser diode and outputs optical signals having the same phase to a plurality of input ends of the optical circuit 3.
- the multichannel laser diode has an active layer and an electrode 11.
- the active layer is formed of a multimode waveguide or a multimode interference waveguide, and the number of channels varies depending on the resonator length and the waveguide width of the active layer. For this reason, in the active layer, the resonator length and the width of the active layer are adjusted according to the number of channels of the optical circuit 3.
- FIG. 1 shows a case where the optical circuit 3 has four channels, and the laser diode array 2 outputs optical signals having the same phase to the channels CHa, CHb, CHc, and CHd.
- the optical signal output from the laser diode array 2 is continuous light. Further, the laser diode array 2 changes the intensity of the optical signal according to the magnitude of the drive current Is output from the control circuit 4.
- the optical circuit 3 has at least one interference type optical switch that outputs the optical signal from at least one output port based on optical signals input from a plurality of input terminals.
- the integrated light source 1 according to the first embodiment shown in FIG. 1 includes interference type optical switches 21 to 24, and four interference type optical switches form four channels. In the following description, a to d are used as channel codes.
- Interference optical switches 21 to 24 each have two channels.
- the interference type optical switch has a two-stage configuration. More specifically, in the optical circuit 3, the interference optical switches 21 and 22 are used as the first and second interference optical switches that receive optical signals from the laser diode array 2.
- the optical circuit 3 receives the optical signal from the first output port of the first interference type optical switch and the first output port of the second interference type optical switch, and outputs the optical signal to the subsequent circuit.
- the interference type optical switch 23 is used as the third interference type optical switch.
- the optical circuit 3 receives the optical signal from the second output port of the first interference type optical switch and the second output port of the second interference type optical switch, and outputs the optical signal to the subsequent circuit.
- the interference type optical switch 24 is used as the fourth interference type optical switch.
- the interference optical switches 21 to 24 each have a first optical waveguide, a second optical waveguide, an optical coupler, and a phase shifter.
- the first optical waveguide receives an optical signal from one end and is connected to the optical coupler at the other end.
- the second optical waveguide has an optical signal input from one end and the other end connected to the optical coupler, and has the same optical path length as the first optical waveguide.
- the optical path length means the length of the waveguide until an optical signal input in the same phase reaches the optical coupler.
- the optical coupler couples or branches optical signals input via a plurality of optical waveguides and outputs the combined optical signals to the first and second output ports.
- the phase shifter is provided on the first optical waveguide, and switches the phase difference of the optical signal transmitted through the first optical waveguide according to the control signal.
- the control signal is output by the control circuit 4 described later.
- the output port of each interference type optical switch is shown at a position away from the optical coupler, but the output port of the interference type optical switch is formed integrally with the optical coupler.
- the optical path length from the output end of the optical coupler to the output port can be considered to be substantially zero.
- the optical path length between the output port and the output end of the optical coupler is the same in other drawings.
- the interference optical switch 21 includes a phase shifter 31a, optical waveguides 32a and 32b, an optical coupler 33ab, and output ports 34a and 34b.
- the optical waveguide 32a corresponds to the first optical waveguide.
- the first optical waveguide 32a has one end to which an optical signal output from the laser diode array 2 is input, and the other end connected to the optical coupler 33ab.
- the optical waveguide 32b corresponds to a second optical waveguide.
- the second optical waveguide 32b has an optical signal output from the laser diode array 2 at one end and the other end connected to the optical coupler 33ab.
- the optical coupler 33ab bundles the optical waveguide 32a and the optical waveguide 32b, and couples or branches the optical signal according to the phase difference between the optical signals transmitted through the two optical waveguides, and the first output port 34a. Output to the second output port 34b.
- a phase shifter 31a is disposed on the first optical waveguide 32a. Further, the phase shifter 31a determines the phase difference between the optical signal transmitted through the first optical waveguide 32a and the optical signal transmitted through the second optical waveguide 32b in accordance with the value of the control signal S21 output from the control circuit 4. change.
- the interference optical switch 22 includes a phase shifter 31c, optical waveguides 32c and 32d, an optical coupler 33cd, and output ports 34c and 34d.
- the optical waveguide 32c corresponds to the first optical waveguide.
- the first optical waveguide 32c has one end to which an optical signal output from the laser diode array 2 is input, and the other end connected to the optical coupler 33cd.
- the optical waveguide 32d corresponds to a second optical waveguide.
- the second optical waveguide 32d receives an optical signal output from the laser diode array 2 at one end and is connected to the optical coupler 33cd at the other end.
- the optical coupler 33cd bundles the optical waveguide 32c and the optical waveguide 32d, and couples or branches the optical signal according to the phase difference between the optical signals transmitted through the two optical waveguides, and the first output port 34c. Output to the second output port 34d.
- a phase shifter 31c is disposed on the first optical waveguide 32c. Further, the phase shifter 31c calculates the phase difference between the optical signal transmitted through the first optical waveguide 32c and the optical signal transmitted through the second optical waveguide 32d in accordance with the value of the control signal S22 output from the control circuit 4. change.
- the interference optical switch 23 includes a phase shifter 41a, optical waveguides 42a and 42b, an optical coupler 43ab, and output ports 44a and 44b.
- the optical waveguide 42a corresponds to the first optical waveguide. One end of the first optical waveguide 42a is input with an optical signal output from the first output port 34a of the interference optical switch 21, and the other end is connected to the optical coupler 43ab.
- the optical waveguide 42b corresponds to a second optical waveguide. In the second optical waveguide 42b, an optical signal output from the first output port 34c of the interference optical switch 22 is input to one end, and the other end is connected to the optical coupler 43ab.
- the optical coupler 43ab bundles the optical waveguide 42a and the optical waveguide 42b, and couples or branches the optical signal according to the phase difference of the optical signal transmitted through the two optical waveguides, and the first output port 44a. Output to the second output port 44b.
- a phase shifter 41a is disposed on the first optical waveguide 42a. Further, the phase shifter 41a determines the phase difference between the optical signal transmitted through the first optical waveguide 42a and the optical signal transmitted through the second optical waveguide 42b in accordance with the value of the control signal S23 output from the control circuit 4. change.
- the interference optical switch 24 includes a phase shifter 41d, optical waveguides 42c and 42d, an optical coupler 43cd, and output ports 44c and 44d.
- the optical waveguide 42c corresponds to a first optical waveguide. In the first optical waveguide 42c, an optical signal output from the second output port 34b of the interference optical switch 21 is input to one end, and the other end is connected to the optical coupler 43cd.
- the optical waveguide 42d corresponds to a second optical waveguide. One end of the second optical waveguide 42d receives an optical signal output from the second output port 34d of the interference optical switch 22, and the other end is connected to the optical coupler 43cd.
- the optical coupler 43cd bundles the optical waveguide 42c and the optical waveguide 42d, and couples or branches the optical signal according to the phase difference between the optical signals transmitted through the two optical waveguides, and the first output port 44c. Output to the second output port 44d.
- a phase shifter 41d is disposed on the second optical waveguide 42d. Further, the phase shifter 41d determines the phase difference between the optical signal transmitted through the first optical waveguide 42c and the optical signal transmitted through the second optical waveguide 42d in accordance with the value of the control signal S24 output from the control circuit 4. change.
- the interference type optical switches 21 to 24 form a two-stage multistage circuit. More specifically, in the optical circuit 3, an optical signal output from the first output port 34 a of the interference optical switch 21 is given to one end of the first optical waveguide 42 a of the interference optical switch 23. In the optical circuit 3, an optical signal output from the first output port 34 c of the interference optical switch 22 is given to one end of the second optical waveguide 42 b of the interference optical switch 23. In the optical circuit 3, an optical signal output from the second output port 34 b of the interference optical switch 21 is applied to one end of the first optical waveguide 42 c of the interference optical switch 24.
- an optical signal output from the second output port 34 d of the interference optical switch 22 is applied to one end of the second optical waveguide 42 d of the interference optical switch 24. That is, in the optical circuit 3 according to the first embodiment, the second optical waveguide 42b of the interference type optical switch 23 arranged in the second stage intersects with the first optical waveguide 42c of the interference type optical switch 24. It is one of the features that it arrange
- the waveguides of the respective interference switches have the same optical path length. That is, the optical path lengths of the first optical waveguide 32a and the second optical waveguide 32b are equal, the optical path lengths of the first optical waveguide 32c and the second optical waveguide 32d are equal, and the first optical waveguide 42a and the first optical waveguide 42a The optical path lengths of the two optical waveguides 42b are equal, and the optical path lengths of the first optical waveguide 42c and the second optical waveguide 42d are equal.
- the first optical waveguide 32a, the first optical waveguide 32c, the first optical waveguide 42a, and the second optical waveguide 42d each have a phase shifter having a phase adjustment function.
- Phase adjustment methods include using a thermo-optic effect by placing a heater in the waveguide, using an electro-optic effect using an electro-optic material, and using a carrier plasma effect by doping impurity carriers, etc. Can be used as long as it has other phase adjustment functions.
- the optical couplers 33ab, 33cd, 43ab, and 43cd are two-input and two-output (hereinafter referred to as 2x2 type) optical couplers, which are directional couplers, Any of a mode interferometer type may be used.
- FIG. 2 shows a graph showing output characteristics of the interference optical switch used in the integrated light source 1 according to the first embodiment.
- the graph shown in FIG. 2 shows the output characteristics of the interference optical switch 21, but the other interference optical switches have similar characteristics.
- the interference optical switch 21 when the phase difference between the two optical signals is zero, the interference optical switch 21 outputs an optical signal having the same intensity to the first output port 34a and the second output port 34b.
- the interference optical switch 21 When the phase shifter 31a gives ⁇ / 2 to the optical signal transmitted by the phase shifter 31a to the first optical waveguide 32a, the interference optical switch 21 has twice the intensity of the optical signal input to the first output port 34a. And the optical signal of the second output port 34b is made substantially zero.
- the interference optical switch 21 When the phase shifter 31a gives - ⁇ / 2 to the optical signal transmitted to the first optical waveguide 32a, the interference optical switch 21 has twice the intensity of the optical signal input to the second output port 34b. An optical signal with an intensity is output, and the optical signal at the first output port 34a is substantially zero.
- FIG. 3 shows a graph showing the output characteristics of all the channels of the laser diode array 2 of the integrated light source 1 according to the first embodiment.
- the laser diode array 2 increases the intensity of the optical signal according to the magnitude of the drive current Is.
- FIG. 4 shows the relationship between input and output in one interference type optical switch (for example, interference type optical switch 21).
- interference type optical switch 21 both the first output port and the second output port are simply referred to as output ports, and the difference in channel is indicated by the symbols a to d in the symbols.
- phase difference applied to the phase shifter 31 when the phase difference applied to the phase shifter 31 is zero, optical signals having the same intensity as the optical signals input from the channels CHa and CHb are output from the output ports 34a and 34b.
- phase difference given to the phase shifter 31 is ⁇ / 2
- an optical signal having twice the intensity of the optical signal input from the channels CHa and CHb is output from the output port 34a, and the light output from the port 34b Cut off the signal.
- the phase difference applied to the phase shifter 31 is ⁇ / 2
- an optical signal having twice the intensity of the optical signal input from the channels CHa and CHb is output from the output port 34b and output from the port 34a. Block the optical signal.
- FIG. 5 shows a phase shifter when optical signals having the same intensity are output from four output ports (for example, output ports 44a to 44d) using four interference type optical switches (for example, interference type optical switches 21 to 24). Shows the condition of the phase difference given to.
- the phase difference applied to the phase shifters 31a and 31c and the phase shifters 41a and 41d are all zero, so that the same intensity as the input optical signal Are output to the output ports 44a to 44d. Further, the optical signals output to the output ports 44a to 44d have the same intensity.
- FIG. 6 shows an optical signal having twice the intensity of the optical signal input from two output ports using four interference optical switches (for example, interference optical switches 21 to 24). This shows the condition of the phase difference given to the phase shifter when the optical signal output from the output port is cut off.
- the phase difference given to the phase shifters 31a and 31c of the interference optical switches 21 and 22 arranged in the preceding stage is ⁇ / 2 or ⁇ / 2.
- an optical signal having twice the intensity of the optical signal input from the two output ports of the interference optical switches 21 and 22 arranged in the preceding stage is output.
- the phase difference applied to the phase shifters 41a and 41d of the interference type optical switches 23 and 24 arranged in the subsequent stage is set to zero so that the signals are output from the output ports of the interference type optical switches 21 and 22 in the previous stage.
- the optical signal is output from any two of the output ports 44a to 44d while maintaining the intensity of the optical signal.
- the phase difference given to the phase shifters 31a and 31c of the interference optical switches 21 and 22 arranged in the previous stage is set to zero, so that The optical signals having the same intensity as the optical signals input from the four output ports of the interference type optical switches 21 and 22 arranged at the same position are output.
- the phase difference given to the phase shifters 41a and 41d of the interferometric optical switches 23 and 24 arranged in the subsequent stage is set to ⁇ / 2 or ⁇ / 2, so that one of the output ports 44a to 44d An optical signal having twice the intensity of the optical signal input from the two is output.
- the integrated light source 1 according to the first embodiment gives a phase difference of ⁇ / 2 or ⁇ / 2 to the phase shifters 31a and 31c of the interference optical switches 21 and 22 arranged in the preceding stage.
- a phase difference of ⁇ / 2 or ⁇ / 2 is given to one of the phase shifters 41a and 41d of the interference type optical switches 23 and 24 arranged in the subsequent stage, and the other phase difference of the phase shifters 41a and 41d is set to zero.
- the integrated light source 1 according to the first embodiment outputs an optical signal having an intensity four times that of the optical signal input from any one of the output ports 44a to 44d. Output.
- the integrated light source 1 controls the phase difference applied to the phase shifter, thereby allowing an optical signal having an intensity higher than the intensity of the optical signal output from the laser diode array 2 to be included in some ports. Can be output from.
- the integrated light source 1 according to the first embodiment can reduce the power of the input optical signal to 1 ⁇ 4, for example, when the optical signal is output from one output port. it can.
- the intensity of the optical signal output from the optical circuit 3 can be reduced from 4P0 to P0 by reducing the current value from I4 to I1 (see FIG. 3).
- the current value is decreased from I2 to I1 in order to halve the power of the optical signal output from the optical circuit 3 from 2P0 to P0. (See FIG. 3).
- the drive current Is is increased or decreased according to the number of output ports that output optical signals according to the control signal that the control circuit 4 gives to the phase shifter.
- the power consumption Is is reduced by reducing the drive current Is according to the number of output ports that output the optical signal while keeping the intensity of the optical signal to be output constant. Electric power can be reduced.
- the semiconductor laser functioning as the light emitting unit needs to output an optical signal that secures the signal intensity for at least one channel.
- the power cannot be reduced below this.
- the laser diode array 2 may have a maximum optical signal intensity required for one channel, and the number of output ports that output optical signals is reduced. In this case, the intensity of the optical signal given to the optical circuit 3 can be made equal to or less than the signal intensity for one channel.
- the integrated light source 1 since the integrated light source 1 according to the first embodiment uses multi-channel laser diodes that are output in the same phase, the path can be switched without causing a confluence loss in the optical coupler, and a compact optical circuit can be realized. Can be formed. And when outputting optical signals only to the necessary ports, the current of the multi-channel laser diode can be lowered according to the number of output ports, so even if the multi-channel laser diode is operating in all channels, the power consumption is reduced. It becomes possible.
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Abstract
Description
以下では、図面を参照して本発明の実施の形態について説明する。図1は、本実施形態における集積光源1を示すブロック図である。図1に示すように、集積光源1は、発光部(例えば、レーザーダイオードアレイ2)、光回路3、制御回路4を有する。
2 レーザーダイオードアレイ
3 光回路
4 制御回路
11 電極
21~24 干渉型光スイッチ
31a、31c 位相シフタ
32a~32d 光導波路
33ab、33cd 光カプラ
34a~34d 出力ポート
41a、41d 位相シフタ
42a~42d 光導波路
43ab、43cd 光カプラ
44a~44d 出力ポート
CHa~CHd チャンネル
Claims (9)
- 複数の入力端から入力される光信号に基づき少なくとも1つの出力ポートから前記光信号を出力する干渉型光スイッチを少なくとも1つ有する光回路と、
前記複数の入力端に対して同位相の光信号を出力する発光部と、を有し、
前記干渉型光スイッチは、
複数の光導波路を介して入力される前記光信号を結合又は分岐させて第1、第2の出力ポートに出力する光カプラと、
一端から前記光信号が入力され、他端が前記光カプラに接続される第1の光導波路と、
一端から前記光信号が入力され、他端が前記光カプラに接続され、前記第1の光導波路と同じ光路長を有する第2の光導波路と、
前記第1の光導波路上に設けられ、制御信号に応じて前記第1の光導波路を伝達する前記光信号の位相差を切り替える位相シフタと、
を有する集積光源。 - 前記発光部は、同位相の前記光信号を出力する多チャンネルレーザーダイオードを有し、前記多チャンネルレーザーダイオードは、活性層がマルチモード導波路又はマルチモード干渉導波路を有する請求項1に記載の集積光源。
- 前記光回路は、複数の前記干渉型光スイッチを有し、
前記発光部から前記光信号を受信する第1、第2の干渉型光スイッチと、
前記第1の干渉型光スイッチの第1の出力ポート及び前記第2の干渉型光スイッチの第1の出力ポートから前記光信号を受信して後段回路に前記光信号を出力する第3の干渉型光スイッチと、
前記第1の干渉型光スイッチの第2の出力ポート及び前記第2の干渉型光スイッチの第2の出力ポートから前記光信号を受信して後段回路に前記光信号を出力する第4の干渉型光スイッチと、
を有する請求項1又は2に記載の集積光源。 - 前記制御信号を出力する制御回路を有し、
前記制御回路は、前記干渉型光スイッチの前記複数の出力ポートから等しい強さの前記光信号を出力することを指示する場合、前記第1の光導波路を伝達する前記光信号の位相差をゼロとする前記制御信号を前記位相シフタに対して出力する請求項1乃至3のいずれか1項に記載の集積光源。 - 前記制御信号を出力する制御回路を有し、
前記制御回路は、前記干渉型光スイッチの前記複数の出力ポートの1つから前記第1、第2の光導波路の一端に入力される光信号の強度の2倍の強さの前記光信号を出力することを指示する場合、前記第1の光導波路を伝達する前記光信号の位相差をπ/2又は-π/2とする前記制御信号を前記位相シフタに対して出力する請求項1乃至3のいずれか1項に記載の集積光源。 - 前記制御回路は、
前記光信号を出力する前記出力ポートの数が減少した場合、前記発光部において前記光信号を出力するレーザーダイオードに与える電流を減少させる請求項5に記載の集積光源。 - 複数の入力端から入力される光信号に基づき少なくとも1つの出力ポートから前記光信号を出力する干渉型光スイッチを少なくとも1つ有する光回路と、
前記複数の入力端に対して同位相の光信号を出力する発光部と、を有し、
前記干渉型光スイッチが、
複数の光導波路を介して入力される前記光信号を結合又は分岐させて第1、第2の出力ポートに出力する光カプラと、
一端から前記光信号が入力され、他端が前記光カプラに接続される第1の光導波路と、
一端から前記光信号が入力され、他端が前記光カプラに接続され、前記第1の光導波路と同じ光路長を有する第2の光導波路と、
前記第1の光導波路上に設けられ、制御信号に応じて前記第1の光導波路を伝達する前記光信号の位相差を切り替える位相シフタと、を有する集積光源における光出力制御方法であって、
前記位相シフタが前記光信号に位相差を与えることで、前記複数の出力ポートの一部から前記光信号を出力する場合に、前記光信号を出力する前記出力ポートの数が減少したことに応じて前記発光部における前記光信号の出力を低下させる光出力制御方法。 - 前記干渉型光スイッチの前記複数の出力ポートの1つから前記第1、第2の光導波路の一端に入力される光信号の強度の2倍の強さの前記光信号を出力する場合、前記第1の光導波路を伝達する前記光信号の位相差をπ/2又は-π/2とする前記制御信号を前記位相シフタに対して与える請求項7に記載の光出力制御方法。
- 前記光信号を出力する前記出力ポートの数が減少した場合、前記発光部において前記光信号を出力するレーザーダイオードに与える電流を減少させる請求項7又は8に記載の光出力制御方法。
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