WO2022130512A1 - 光送信器 - Google Patents
光送信器 Download PDFInfo
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- WO2022130512A1 WO2022130512A1 PCT/JP2020/046820 JP2020046820W WO2022130512A1 WO 2022130512 A1 WO2022130512 A1 WO 2022130512A1 JP 2020046820 W JP2020046820 W JP 2020046820W WO 2022130512 A1 WO2022130512 A1 WO 2022130512A1
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- light
- light source
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- wavelength
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- 230000003287 optical effect Effects 0.000 title claims abstract description 110
- 230000005540 biological transmission Effects 0.000 claims description 8
- 239000011521 glass Substances 0.000 description 12
- 239000013307 optical fiber Substances 0.000 description 9
- 238000002834 transmittance Methods 0.000 description 6
- 238000004891 communication Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000003321 amplification Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
-
- 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
- H04B10/50—Transmitters
- H04B10/564—Power control
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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
-
- 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
- H04B10/50—Transmitters
- H04B10/501—Structural aspects
- H04B10/506—Multiwavelength transmitters
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
Definitions
- the present invention relates to an optical transmitter, and more particularly to a multi-wavelength channel optical transmitter in which a wavelength division multiplexing optical transmission method is used.
- a wavelength division multiplexing optical transmission method has been used to increase the transmission capacity in an optical communication system with the increase in communication traffic.
- a light source is prepared for each wavelength channel, and output light from a plurality of light sources is combined by an optical combiner and output to an optical fiber.
- it is required to keep the light intensity of an optical transmission signal constant, and in a wavelength division multiplexing optical transmission method, it is also necessary to keep the light intensity of each wavelength channel constant. Therefore, a part of the optical transmission signal is branched to monitor the light intensity, and the light source is controlled so that the monitored light intensity becomes constant.
- FIG. 1 shows an example of a conventional multi-wavelength channel optical transmitter that multiplexes four wavelengths.
- the output light from the light sources 10a-10d for each wavelength channel is input to the optical combiner 20 via the collimator lenses 31a-31d and is combined.
- the optical combiner 20 In the output of the optical combiner 20, all wavelength channels are multiplexed and coupled to the optical fiber 41 as wavelength division light through the condenser lens 32.
- FIG. 2 shows an example of a light source.
- the light source 10 has a light source chip 11 including a modulation light source unit 16 and an optical amplification unit 15 mounted on the subcarrier 12, and monitors a part of the output light from the modulation light source unit 16 at the rear end of the light source chip 11.
- the monitor PD13 is mounted.
- the monitor PD 13 detects the optical output power of each wavelength channel as a current value, and the control circuit 14 adjusts the amount of current supplied to the light source chip 11 so that the detected current value becomes constant.
- Such an optical output control (APC) circuit makes it possible to keep the optical output power from each light source chip 11 constant (see, for example, Non-Patent Document 2).
- the optical combiner 20 includes a glass block 21, and an antireflection film 22 that transmits the output light from the first light source 10a is formed on the end face on the light source side.
- a reflecting mirror 24 is formed on the end surface of the glass block 21 on the output side, and the output light from the first light source 10a is reflected on the light source side.
- a wavelength filter 23b-23d that transmits the output light from the second light source 10b-10d and reflects the light reflected by the reflector 24 is formed on the end surface on the light source side.
- the optical signal of each wavelength channel reciprocates between the reflecting mirror 24 and the wavelength filter 23b, is multiplexed in order, passes through the antireflection film 25 formed on the end face on the output side, and is wavelength-multiplexed light. Is output as.
- the configuration in which the monitor PD 13 is arranged at the rear end of the light source chip 11 can monitor the optical output power proportional to the output light from the light source chip 11.
- FIG. 3 shows another example of a conventional multi-wavelength channel optical transmitter.
- the output light from the light source 50a-50d for each wavelength channel is input to the optical combiner 20 via the collimator lens 31a-31d and the beam splitter 53a-53d, and is combined.
- all wavelength channels are multiplexed as wavelength division light through the condenser lens 32 and coupled to the optical fiber 41 (see, for example, Non-Patent Document 1).
- the output light from the light source chip 51 is partially branched by the beam splitter 53a-53d and monitored by the monitor PD54a-54d.
- the output of the monitor PD54a-d is input to the control circuit of the light source 50, and the amount of current supplied to the light source chip 51 is adjusted so that the detected current value becomes constant.
- the output from the optical amplification unit of the light source 50 can be accurately monitored, but the light loss is increased by the passing loss of the beam splitter 53. Occur. Further, the output light from the first light source 50a has a problem that the optical path length transmitted through the optical combiner 20 is long as compared with the optical path lengths of other wavelength channels, so that the loss is large.
- One embodiment of the present invention is an optical transmitter that multiplexes and outputs a plurality of wavelength channels, and has one or more different wavelengths from the first light source and the first light source, each having a different wavelength.
- the second light source and the output light from the first light source are transmitted from the first end face to the opposite second end face and reflected by the reflecting mirror formed on the second end face, and the second end face is used.
- the output light from the light source is transmitted through the wavelength filter formed on the first end face, reflected by the reflecting mirror, and the output light of each wavelength channel is reciprocated between the reflecting mirror and the wavelength filter in order.
- An optical combiner to be multiplexed a first monitor PD that monitors optical power by using a part of the output light from the first light source as reflected light or transmitted light from the optical combiner, and the second light source.
- One or more second beam splitters inserted between each of the first beam splitters and one or more second beam splitters that monitor the optical power branched from each of the second beam splitters. Equipped with a monitor PD.
- the output light of the first light source having the longest optical path length transmitted through the optical combiner is monitored as the reflected light or the transmitted light from the optical combiner, so that the light loss can be suppressed.
- FIG. 1 is a diagram showing an example of a conventional multi-wavelength channel optical transmitter.
- FIG. 2 is a diagram showing an example of a light source of a conventional multi-wavelength channel optical transmitter.
- FIG. 3 shows another example of a conventional multi-wavelength channel optical transmitter,
- FIG. 4 is a diagram showing a multi-wavelength channel optical transmitter according to the first embodiment of the present invention.
- FIG. 5 is a diagram showing a multi-wavelength channel optical transmitter according to a second embodiment of the present invention.
- FIG. 4 shows an example of a multi-wavelength channel optical transmitter according to the first embodiment of the present invention, each of which multiplexes four different wavelengths.
- the output light from the light sources 110a-110d for each wavelength channel is input to the optical combiner 120 via the collimator lens 131a-131d and is combined.
- the optical combiner 120 At the output of the optical combiner 120, all wavelength channels are multiplexed and coupled to the optical fiber 141 as wavelength division light through the condenser lens 132.
- the optical combiner 120 includes a glass block 121, and a beam splitter 122 that transmits the output light from the first light source 110a and branches a part to the monitor PD154a is formed on the end surface on the light source side. That is, a part of the output light from the first light source 110a is input to the monitor PD154a as the reflected light from the optical combiner 120, and the optical power of the output light of the first light source 110a is monitored.
- a reflecting mirror 124 is formed on the end surface of the glass block 121 on the output side, and the output light from the first light source 110a is reflected on the light source side.
- the output light from the second light source 110b-110d is partially branched by the beam splitter 153b-153d, and the optical power of each output light is monitored by the monitor PD154b-154d.
- a wavelength filter 123b-123d that transmits the output light from the second light source 110b-110d and reflects the light reflected by the reflector 124 is formed on the end surface on the light source side.
- the optical signal of each wavelength channel reciprocates between the reflector 124 and the wavelength filter 123b-d, is multiplexed in order, passes through the antireflection film 125 formed on the end face on the output side, and is wavelength-multiplexed light. Is output as.
- the output of the monitor PD154a-d is input to the control circuit of the light source 150, and a current is supplied to the light source chip 151 so that the detected current value becomes constant, that is, the optical power of each output light becomes constant. Adjust the amount.
- the output light from the first light source passes through the beam splitter 53a and the antireflection film 22 of the optical combiner 20 and propagates through the glass block 21.
- the optical transmitter of the first embodiment only the beam splitter 122 of the optical combiner 120 is transmitted and propagates through the glass block 121.
- the antireflection film is a unidirectional transmissive film and can suppress reflection on the end face of the glass block, but a slight reflection component is generated on the incident surface of the antireflection film. Therefore, according to the optical transmitter of the first embodiment, the optical loss corresponding to this reflection component can be suppressed.
- the output light from the first light source 150a has a large loss because the optical path length transmitted through the optical combiner 120 is the longest as compared with the optical path lengths of other wavelength channels, but the light corresponds to the above-mentioned reflection component. The loss can be suppressed.
- the beam splitter 122 integrated in the optical combiner 120 has a reflectance of 4% and a transmittance of 96%. Further, the beam splitter 153bd arranged on the optical path from the second light source 110bd also has a reflectance of 4% and a transmittance of 96%. The transmittance of the antireflection film 22 of the conventional optical transmitter shown in FIG. 3 is 99%. Further, the glass block 121 has a light loss of 1% in propagation between the beam splitter 122 and the wavelength filter 123b-d and the reflector 124. The lens coupling efficiency from the output of the optical combiner 120 to the optical fiber 141 is 63%.
- the output of the light source chip 111 of each wavelength channel was set to + 4 dBm, and the optical output coupled to the optical fiber 141 was measured.
- the light outputs of the light sources 110ad from each wavelength channel 1 to 4 were +1.12, +1.25, +1.47, and +1.69 dBm, respectively.
- the optical outputs of the light sources 10ad from each wavelength channel 1 to 4 were +1.07, +1.25, +1.47, +1.69 dBm.
- the light output of the light source 110a in the wavelength channel 1 can be improved by 0.05 dB.
- FIG. 5 shows an example of a multi-wavelength channel optical transmitter according to a second embodiment of the present invention, each of which multiplexes four different wavelengths.
- the output light from the light source 210a-210d for each wavelength channel is input to the optical combiner 220 via the collimator lens 231a-231d and is combined.
- the optical combiner 220 At the output of the optical combiner 220, all wavelength channels are multiplexed and coupled to the optical fiber 241 as wavelength division light through the condenser lens 232.
- the optical combiner 220 includes a glass block 221 and has an antireflection film 222 that transmits the output light from the first light source 210a on the end surface on the light source side.
- a reflecting mirror 224 is formed on the output side end surface of the glass block 221 to reflect the output light from the first light source 210a to the light source side.
- the reflecting mirror 224 is a total reflection film, a slight amount of a transparent component is generated. That is, a part of the output light from the first light source 210a is input to the monitor PD254a as transmitted light from the optical combiner 220, and the optical power of the output light of the first light source 210a is monitored.
- the output light from the second light source 210b-210d is partially branched by the beam splitter 253b-253d and monitored by the monitor PD254b-254d.
- a wavelength filter 223b-223d that transmits the output light from the second light source 210b-210d and reflects the light reflected by the reflector 224 is formed on the end surface on the light source side.
- the optical signal of each wavelength channel reciprocates between the reflector 224 and the wavelength filter 223bad, is multiplexed in order, and is transmitted through the antireflection film 225 formed on the end face on the output side to perform wavelength division multiplexing light. Is output as.
- the output of the monitor PD254a-d is input to the control circuit of the light source 250, and a current is supplied to the light source chip 251 so that the detected current value becomes constant, that is, the optical power of each output light becomes constant. Adjust the amount.
- the optical transmitter of the second embodiment only the antireflection film 222 of the optical combiner 220 is transmitted and propagates through the glass block 221. Therefore, as compared with the conventional optical transmitter shown in FIG. 3, the optical loss can be suppressed by the passing loss of the beam splitter.
- the antireflection film 222 integrated in the optical combiner 220 has a transmittance of 99%. Further, the beam splitter 253bd arranged on the optical path from the second light source 210bd has a reflectance of 2% and a transmittance of 98%. The beam splitter 53a of the conventional optical transmitter shown in FIG. 3 also has a reflectance of 2% and a transmittance of 98%. Further, the glass block 221 has a light loss of 1% in propagation between the antireflection film 222 and the wavelength filter 223bad and the reflecting mirror 224. The lens coupling efficiency from the output of the optical combiner 220 to the optical fiber 241 is 63%.
- the output of the light source chip 211 of each wavelength channel was set to + 5 dBm, and the optical output coupled to the optical fiber 241 was measured.
- the light outputs of the light sources 210ad from each wavelength channel 1 to 4 were +2.12, +2.26, and +2.52, +2.78 dBm, respectively.
- the optical outputs of the light sources 10ad from each wavelength channel 1 to 4 were +2.04, +2.26, +2.52, +2.78 dBm.
- the light output of the light source 210a in the wavelength channel 1 can be improved by 0.08 dB.
- the present embodiment is a multi-wavelength channel optical transmitter that multiplexes four wavelengths, the first light source of the wavelength channel having the longest optical path length transmitted through the optical combiner, and the third second light source of the other wavelength channels.
- the light source has been described as an example.
- the present embodiment can be applied as long as the number of the second light sources is one or more.
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Abstract
Description
Claims (3)
- 複数の波長チャネルを多重化して出力する光送信器であって、
第1の光源と、
前記第1の光源と波長が異なり、各々が異なる波長の1つ以上の第2の光源と、
前記第1の光源からの出力光を第1の端面から対向する第2の端面に透過させ、前記第2の端面に形成された反射鏡により反射させ、前記第2の光源からの出力光を前記第1の端面に形成された波長フィルタを透過させ、前記反射鏡により反射させ、各波長チャネルの出力光を前記反射鏡と前記波長フィルタとの間を往復させて順に多重化する光合波器と、
前記第1の光源からの出力光の一部を前記光合波器からの反射光または透過光として光パワーをモニタする第1のモニタPDと、
前記第2の光源の各々と前記第1の端面との間に挿入された1つ以上の第2のビームスプリッタと、
前記第2のビームスプリッタの各々から分岐された光パワーをモニタする1つ以上の第2のモニタPDと
を備えたことを特徴とする光送信器。 - 前記第1の端面に形成され、前記第1の光源からの出力光の一部を、前記第1のモニタPDに分岐する第1のビームスプリッタを備えたことを特徴とする請求項1に記載の光送信器。
- 前記第1の光源からの出力光が前記第2の端面に達し、前記反射鏡を透過した一部が前記第1のモニタPDに入力されることを特徴とする請求項1に記載の光送信器。
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PCT/JP2020/046820 WO2022130512A1 (ja) | 2020-12-15 | 2020-12-15 | 光送信器 |
US18/255,819 US20240031034A1 (en) | 2020-12-15 | 2020-12-15 | Optical Transmitter |
JP2022569376A JPWO2022130512A1 (ja) | 2020-12-15 | 2020-12-15 |
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PCT/JP2020/046820 WO2022130512A1 (ja) | 2020-12-15 | 2020-12-15 | 光送信器 |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2014149494A (ja) * | 2013-02-04 | 2014-08-21 | Sumitomo Electric Ind Ltd | 光送信モジュールの製造方法 |
JP2019186472A (ja) * | 2018-04-16 | 2019-10-24 | 三菱電機株式会社 | 光学装置の製造装置および光学装置の製造方法 |
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2020
- 2020-12-15 WO PCT/JP2020/046820 patent/WO2022130512A1/ja active Application Filing
- 2020-12-15 US US18/255,819 patent/US20240031034A1/en active Pending
- 2020-12-15 JP JP2022569376A patent/JPWO2022130512A1/ja active Pending
Patent Citations (2)
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JP2014149494A (ja) * | 2013-02-04 | 2014-08-21 | Sumitomo Electric Ind Ltd | 光送信モジュールの製造方法 |
JP2019186472A (ja) * | 2018-04-16 | 2019-10-24 | 三菱電機株式会社 | 光学装置の製造装置および光学装置の製造方法 |
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JPWO2022130512A1 (ja) | 2022-06-23 |
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