WO2009098999A1 - Module optique, dispositif électronique et système de communication spatiale - Google Patents

Module optique, dispositif électronique et système de communication spatiale Download PDF

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Publication number
WO2009098999A1
WO2009098999A1 PCT/JP2009/051494 JP2009051494W WO2009098999A1 WO 2009098999 A1 WO2009098999 A1 WO 2009098999A1 JP 2009051494 W JP2009051494 W JP 2009051494W WO 2009098999 A1 WO2009098999 A1 WO 2009098999A1
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WO
WIPO (PCT)
Prior art keywords
quantum dot
dot laser
laser
optical module
light
Prior art date
Application number
PCT/JP2009/051494
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English (en)
Japanese (ja)
Inventor
Mitsuru Sugawara
Makoto Usami
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Qd Laser Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Qd Laser Inc. filed Critical Qd Laser Inc.
Publication of WO2009098999A1 publication Critical patent/WO2009098999A1/fr

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/06—Arrangements for controlling the laser output parameters, e.g. by operating on the active medium
    • H01S5/068—Stabilisation of laser output parameters
    • H01S5/0683—Stabilisation of laser output parameters by monitoring the optical output parameters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B82—NANOTECHNOLOGY
    • B82Y—SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES
    • B82Y20/00—Nanooptics, e.g. quantum optics or photonic crystals
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
    • H01S5/00—Semiconductor lasers
    • H01S5/30—Structure or shape of the active region; Materials used for the active region
    • H01S5/34—Structure or shape of the active region; Materials used for the active region comprising quantum well or superlattice structures, e.g. single quantum well [SQW] lasers, multiple quantum well [MQW] lasers or graded index separate confinement heterostructure [GRINSCH] lasers
    • H01S5/341—Structures having reduced dimensionality, e.g. quantum wires
    • H01S5/3412—Structures having reduced dimensionality, e.g. quantum wires quantum box or quantum dash

Definitions

  • the present invention relates to an optical module, an electronic device, and a spatial communication system, and more particularly to an optical module, an electronic device, and a spatial communication system having a quantum dot laser.
  • Optical modules that emit laser light are used in communication systems such as optical communication systems using optical fibers such as FTTH (fiber-to-the-home) and spatial communication systems using light.
  • communication systems such as optical communication systems using optical fibers such as FTTH (fiber-to-the-home) and spatial communication systems using light.
  • FTTH fiber-to-the-home
  • Patent Document 1 JP 2001-85665 A Electronics Letters 2007 Vol.43 pp670-672
  • FIG. 1 is a schematic diagram showing the optical output with respect to the driving current of a Fabry-Perot semiconductor laser using an InP-based semiconductor used at these wavelengths for each temperature.
  • the broken line is the current-light output characteristic immediately after manufacture, and the solid line is the current-light output characteristic after being used for a long time (that is, energized for a long time) and deteriorated.
  • the current-light output characteristics of the semiconductor laser are not constant depending on the temperature and energization time of the semiconductor laser.
  • the current-light output characteristics of the semiconductor laser are not constant.
  • FIG. 2 is a block diagram of a conventional optical module.
  • the optical module 100 includes a semiconductor laser 60a, a drive circuit 62a, a light detection unit 64, an APC circuit 66, and an input unit 68.
  • the input unit 68 receives a transmission data signal 78 from the outside, and outputs a transmission data signal to the drive circuit 62.
  • the drive circuit 62a controls the magnitude of the drive current 72 based on the control signal 76, and outputs the drive current 72 to the semiconductor laser 60a.
  • the drive circuit 62a modulates the drive current 72 with the transmission data signal.
  • the semiconductor laser 60 a emits a laser beam with an optical output corresponding to the drive current 72. Since the drive current 72 is modulated, the laser beam 70 is modulated.
  • the light detection unit 64 made of a photodiode detects a part of the light emitted from the semiconductor laser 60a and outputs a monitor current 74 corresponding to the light output of the semiconductor laser 60a to the APC circuit 66.
  • the APC circuit 66 compares the monitor current 74 with the reference current and outputs a control signal 76 to the drive circuit 62a.
  • the APC circuit 66 is used to keep the optical output constant.
  • the conventional optical module has a problem that it is difficult to reduce the cost because the APC circuit 66a is used.
  • the present invention has been made in view of the above problems, and an object thereof is to provide an optical module, an electronic device, and a spatial communication system that are low in cost and excellent in light stability.
  • the present invention includes a quantum dot laser having a quantum dot formed on a base layer, a cover layer covering the quantum dot, and a drive circuit for supplying a constant drive current to the quantum dot laser.
  • This is an optical module.
  • the quantum dot laser since the quantum dot laser is used, the light output can be made constant without using the APC circuit. Therefore, it is possible to provide an optical module that is low in cost and excellent in light stability.
  • the driving circuit may be configured not to feed back the light output of the quantum dot laser. According to this configuration, an inexpensive optical module can be provided.
  • the base layer may be made of GaAs
  • the cover layer may be made of InGaAs
  • the quantum dots may be made of InAs.
  • the quantum dot laser can emit light for spatial communication.
  • Light used for spatial communication is required to maintain a constant light output from the viewpoint of safety.
  • safety can be ensured.
  • the output wavelength of the quantum dot laser may be 1.2 ⁇ m to 1.6 ⁇ m. In this configuration, damage to the eyes can be suppressed.
  • the present invention includes a quantum dot laser having a quantum dot formed on a base layer and a cover layer covering the quantum dot, and emitting light having a wavelength of 1.2 ⁇ m to 1.6 ⁇ m in a space, and constant driving
  • a spatial communication transmitter having a drive circuit for supplying current to the quantum dot laser, and a spatial communication receiver having a light receiving element that receives light having a wavelength of 1.2 ⁇ m to 1.6 ⁇ m from the space.
  • An electronic device is provided. According to the present invention, since light having a wavelength of 1.2 ⁇ m to 1.6 ⁇ m is used as the light emitted to the space, damage to the eyes can be suppressed. Further, since the quantum dot laser is used, the output can be maintained at a constant value, and further safety can be ensured. In addition, since it is not necessary to use an APC circuit, manufacturing cost can be reduced.
  • the present invention includes a quantum dot laser having a quantum dot formed on a base layer and a cover layer covering the quantum dot and emitting light having a wavelength of 1.2 ⁇ m to 1.6 ⁇ m in a space;
  • a first device having a drive circuit for supplying a drive current to the quantum dot laser, and a second device having a light receiving element that receives light emitted from the quantum dot laser of the transmission device from space.
  • the present invention includes a first quantum dot laser having a quantum dot formed on a base layer and a cover layer covering the quantum dot and emitting light having a wavelength of 1.2 ⁇ m to 1.6 ⁇ m in a space.
  • a spatial communication system comprising: a device; and a second device having a light receiving element that receives light emitted from the space by the quantum dot laser of the transmission device. According to the present invention, it is possible to provide a spatial communication system that is excellent in safety and low in cost.
  • the quantum dot laser since the quantum dot laser is used, the light output can be made constant without using the APC circuit. Therefore, it is possible to provide an optical module, an electronic device, and a spatial communication system that are low in cost and excellent in light stability.
  • FIG. 1 is a schematic diagram showing current-light output characteristics of a conventional semiconductor laser.
  • FIG. 2 is a block diagram showing a conventional optical module.
  • FIG. 3 is a block diagram of the optical module according to the first embodiment.
  • FIG. 4 is a cross-sectional view of the quantum dot laser of Example 1.
  • FIG. 5 is an enlarged cross-sectional view of the vicinity of the quantum dots of the quantum dot laser of Example 1.
  • FIG. 6 is a diagram showing temperature dependence of current-light output characteristics in a quantum dot laser.
  • FIGS. 7A and 7B are diagrams showing the results of investigating the deterioration with respect to the energization time in the quantum dot laser.
  • FIG. 8 is a block diagram of a spatial communication system according to the second embodiment.
  • FIG. 3 is a block diagram of the optical module according to the first embodiment.
  • the optical module 100 according to the first embodiment does not include a light receiving element and an APC circuit.
  • a quantum dot laser is used as the semiconductor laser 60a.
  • FIG. 4 is a schematic sectional view of the quantum dot Fabry-Perot laser 50.
  • five GaAs base layers 12 and five quantum dot active layers are stacked on a p-type AlGaAs cladding layer 10.
  • An n-type AlGaAs cladding layer 14 is formed on the base layer 12.
  • the n-type AlGaAs cladding layer 14 is isolated, and the quantum dot laser 50 has a ridge structure.
  • An n-electrode 16 is formed on the n-type AlGaAs cladding layer 14, and a p-electrode 18 is formed below the p-type AlGaAs cladding layer 10.
  • the n-type AlGaAs cladding layer 14 has a width of 1.8 ⁇ m and a length of 0.25 mm.
  • FIG. 5 is an enlarged view of the quantum dot active layer and the base layer 12.
  • a first InGaAs layer 22 having a thickness of about 2 nm is formed on the GaAs base layer 12 having a thickness of about 50 nm.
  • a plurality of quantum dots 30 made of InAs are formed on the first InGaAs layer 22.
  • a second InGaAs layer 24 having a thickness of 6 nm is formed so as to cover the quantum dots 30.
  • the first InGaAs layer 22 and the second InGaAs layer 24 constitute the cover layer 20, and the respective In composition ratios are 0.15 and 0.2.
  • a GaAs base layer 12 is formed on the second InGaAs layer 24.
  • FIG. 6 is a diagram showing current-light output characteristics at each temperature of the quantum dot laser 50. As shown in FIG. 6, the temperature dependency of the current-light output characteristics of the quantum dot laser 50 is small.
  • the base layer 12 is made of GaAs
  • the cover layer 20 is made of InGaAs
  • the quantum dots 30 are made of InAs. Thereby, the temperature dependence of light output can be suppressed.
  • FIG. 7A is a diagram showing deterioration of optical output due to energization of the quantum dot laser 50.
  • the quantum dot laser 50 is used as the semiconductor laser 60a of the optical module in FIG. On the other hand, it is illustrated.
  • FIG. 7B is a diagram showing a ratio between the change amount (I-I start ) from the drive current I start at the start of energization of the drive current I and I start .
  • the drive current is controlled by the APC circuit 66 so that an optical output of 2 mW can be obtained at an environmental temperature of 90 ° C.
  • the plurality of lines in FIGS. 7A and 7B indicate the drive currents I of the plurality of quantum dot lasers 50, respectively. From FIG. 7A and FIG.
  • the driving current I of the quantum dot laser 50 is substantially constant even when the energization test is performed. In other words, the light output is almost constant even when the driving current I of the quantum dot laser 50 is kept constant. As described above, the quantum dot laser 50 has substantially constant current-light output characteristics with respect to temperature and energization time.
  • the optical module 100 includes a quantum dot laser 50 and a drive circuit 62 that supplies a constant drive current 72 to the quantum dot laser 60 as shown in FIG.
  • the quantum dot laser 50 outputs laser light with a constant light output even when the driving circuit 62 that supplies the constant driving current 72 to the quantum dot laser 50 is used. can do. Therefore, the APC circuit as shown in FIG. 2 is not necessary. That is, the drive circuit 62 does not feed back the light output of the quantum dot laser 60. For this reason, the light output is constant and the cost can be reduced.
  • Example 2 is an example of a spatial communication system using Example 1.
  • FIG. 8 is a block diagram of a spatial communication system according to the second embodiment.
  • the spatial communication system 120 includes a first device 80a and a second device 80b.
  • the first device 80a and the second device 80b have transmission units 82a and 82b, reception units 84a and 84b, and control units 86a and 86b, respectively.
  • the transmitters 82a and 82b are the optical modules of the first embodiment, convert the transmission data signal from the controller 86a into light, and have a wavelength in the space of 1.2 ⁇ m to 1.6 ⁇ m, preferably 1.25 ⁇ m to 1.
  • Laser light 88a and 88b of 35 ⁇ m, for example 1.31 ⁇ m, are emitted.
  • the receivers 84a and 84b include a light receiving element 90 that is a photodiode, and an amplifier 92 that amplifies the current output from the light receiving element 90.
  • the receivers 84a and 84b receive light 88b and 88a having wavelengths of 1.2 ⁇ m to 1.6 ⁇ m, for example 1.31 ⁇ m, emitted from the transmitters 82b and 82a from the space, respectively, and control units 86a and 86b as received data signals. Output to.
  • the data transfer rate when the quantum dot laser is a laser for 10 Gbps optical communication is calculated. Since the image data compressed by the MPEG4-AVC method of 1 hour DVD is 1 Mbps, the data for 3600 seconds is 3.6 Gbit. That is, if the spatial communication system 120 is used, it is possible to transfer this data in one second or less.
  • the wavelength of light used is 1.2 ⁇ m to 1.6 ⁇ m, and it is difficult to damage the eyes, so safety can be ensured.
  • the light output is required to be a certain standard or less from the viewpoint of further safety.
  • a quantum dot laser is used for the transmitters 82a and 82b, a stable light output can be obtained without using an APC circuit. Therefore, it is possible to reduce the optical output to a certain standard or less that can ensure safety and to reduce the cost.
  • the first device 80a and the second device 80b have the same transmission units 82a and 82b and the reception units 84a and 84b has been described, but the first device 80a has the transmission unit 82a.
  • the second device 80b does not have to include the receiving unit 84a, and may include the receiving unit 84b and not include the transmitting unit 82b.
  • the first device 80a and the second device 80b can each be a personal computer. This enables high-speed data communication between personal computers.
  • the first device 80a can be an electronic device such as a mobile phone, a digital camera, and a video camera
  • the second device 80b can be an electronic device such as a personal computer.
  • the image data can be transferred from the first device 80a to the second device 80b in a short time.
  • the first device 80a may be a personal computer and the second device 80b may be a projector. Thereby, image data can be transferred from the personal computer to the projector at high speed.
  • the first device 80a may be mounted on a vehicle, and the second device 80b may be installed on the road or on the ground.
  • image data captured by the vehicle monitoring camera can be temporarily stored in the storage device of the vehicle, and the image data can be periodically transmitted to a device on the road or on the ground.

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  • Physics & Mathematics (AREA)
  • Nanotechnology (AREA)
  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (AREA)
  • Biophysics (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Electromagnetism (AREA)
  • General Physics & Mathematics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Condensed Matter Physics & Semiconductors (AREA)
  • Semiconductor Lasers (AREA)
  • Optical Communication System (AREA)

Abstract

La présente invention a trait à un module optique équipé d'un laser à point quantique (60), sur lequel est formé un point quantique sur une couche de base et une couche de fermeture recouvrant le point quantique ; et d'un circuit d'attaque (62) qui fournit au laser à point quantique un courant d'attaque constant. Lorsque le laser à point quantique est utilisé, la sortie optique peut être fixée sans utiliser de circuit APC.
PCT/JP2009/051494 2008-02-06 2009-01-29 Module optique, dispositif électronique et système de communication spatiale WO2009098999A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2008-027098 2008-02-06
JP2008027098A JP2009188216A (ja) 2008-02-06 2008-02-06 光モジュール、電子機器および空間通信システム

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WO2009098999A1 true WO2009098999A1 (fr) 2009-08-13

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011046004A1 (fr) * 2009-10-13 2011-04-21 株式会社Ｑｄレーザ Dispositif optique d'emission/de reception

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
"Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006, 2006.03", article YAMABANA T. ET AL.: "Temperature independent transmission for 10 Gbps 300m-MMF using low driving-current quantum dot laser" *
OTSUBO K. ET AL.: "Temperature-Insensitive Eye- Opening under 10-Gb/s Modulation of 1.3-pm P- Doped Quantum-Dot Lasers without Current Adjustments", JAPANESE JOURNAL OF APPLIED PHYSICS, vol. 43, no. 8B, 2004, pages L1124 - L1126 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011046004A1 (fr) * 2009-10-13 2011-04-21 株式会社Ｑｄレーザ Dispositif optique d'emission/de reception

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