WO2022269805A1 - 多チャネル光モジュール - Google Patents
多チャネル光モジュール Download PDFInfo
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- WO2022269805A1 WO2022269805A1 PCT/JP2021/023794 JP2021023794W WO2022269805A1 WO 2022269805 A1 WO2022269805 A1 WO 2022269805A1 JP 2021023794 W JP2021023794 W JP 2021023794W WO 2022269805 A1 WO2022269805 A1 WO 2022269805A1
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- beam splitter
- optical
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- wavelength
- channel
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- 230000003287 optical effect Effects 0.000 title claims abstract description 80
- 238000012544 monitoring process Methods 0.000 claims description 7
- 239000010409 thin film Substances 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 description 7
- 239000000758 substrate Substances 0.000 description 6
- 238000004891 communication Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 239000013307 optical fiber Substances 0.000 description 5
- 238000005259 measurement Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/03—WDM arrangements
- H04J14/0305—WDM arrangements in end terminals
-
- 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
Definitions
- the present invention relates to a multi-channel optical module, and more particularly to a multi-channel optical module that serves as an optical transmitter in an optical communication system using a wavelength division multiplexing optical transmission system.
- wavelength division multiplexing optical transmission systems have been used to increase transmission capacity in optical communication systems.
- a light source is prepared for each wavelength channel, and the output lights from the plurality of light sources are multiplexed by an optical multiplexer 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 system, it is also necessary to keep the light intensity of each wavelength channel constant. Therefore, 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 is constant.
- FIG. 1 shows an example of a conventional multi-channel optical module, an optical transmitter that multiplexes four wavelengths.
- Output lights from the light source chips 11a to 11d mounted on the light source for each wavelength channel are input to the optical multiplexer 20 via the collimator lenses 31a to 31d, and multiplexed.
- the output of the optical multiplexer 20 passes through the condensing lens 32 as wavelength-multiplexed light, in which all wavelength channels are multiplexed and coupled to the optical fiber 41 .
- Fig. 2 shows an example of a light source of a conventional multi-channel optical module.
- a light source chip 11 including a modulated light source section 16 and an optical amplifier section 15 is mounted on a subcarrier 12, and a monitor for monitoring part of the output light from the modulated light source section 16 is provided at the rear end of the light source chip 11.
- PD13 is installed.
- 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 always constant (see Non-Patent Documents 2 and 3, for example).
- 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-channel optical module.
- FIG. 3(a) shows the structure of the multiplexer viewed from the plane of the substrate
- FIG. 3(b) shows the structure of the multiplexer viewed from the side of the substrate.
- Output lights from the light source chips 11a to 11d mounted on the light source for each wavelength channel are input to the optical combiner 20 via the collimator lenses 31a to 31d and the beam splitter 51, and combined.
- the output of the optical multiplexer 20 passes through the condenser lens 32 as wavelength-multiplexed light, in which all wavelength channels are multiplexed and coupled to the optical fiber 41 (see Non-Patent Document 1, for example).
- a part of the output light from the light source chips 11a-11d is split by the beam splitter 51 and monitored by the monitor PDs 53a-53d.
- the outputs of the monitor PDs 53a-53d are input to the control circuit 14 of the light source, and the amount of current supplied to the light source chip 11 is adjusted so that the detected current value becomes constant.
- the configuration in which the monitor PD 53 is arranged on the output side of the light source chip 11 can accurately monitor the output from the light amplification section 15 of the light source, but the light loss is caused by the passage loss of the beam splitter 51. Occur.
- the spread of the output beam from the light source chip 11 is large, and as indicated by the thin line in FIG. , and stray light components that do not contribute to the collimated light are output.
- the stray light component exceeding the effective diameter of the collimator lens 31 is coupled with the monitor PD 13 of the adjacent channel, causing crosstalk.
- An object of the present invention is to provide a multi-channel optical module that suppresses crosstalk between adjacent channels when monitoring optical output power.
- one embodiment of the present invention provides a multi-channel optical module for multiplexing and outputting a plurality of wavelength channels, comprising a plurality of light sources each having a different wavelength; a plurality of collimator lenses coupled to the output of each of the light sources, a beam splitter coupled to the output of each of the plurality of collimator lenses, and a plurality of monitor PDs for monitoring optical power split from the beam splitters; characterized by comprising a plurality of wavelength filters inserted between the beam splitter and each of the plurality of monitor PDs, the wavelength filters transmitting only the wavelengths of the light sources coupled by the beam splitter.
- FIG. 1 is a diagram showing an example of a conventional multi-channel optical module
- FIG. 2 is a diagram showing an example of a light source of a conventional multi-channel optical module
- FIG. 3 is a diagram showing another example of a conventional multi-channel optical module
- FIG. 4 is a diagram showing a multi-channel optical module according to a first embodiment of the present invention
- FIG. 5 is a diagram showing a multi-channel optical module according to Example 2 of the present invention.
- FIG. 4 shows an example of a multi-channel optical module according to the first embodiment of the present invention, which is an optical transmitter that multiplexes four different wavelengths.
- FIG. 4(a) shows the structure of the multiplexer viewed from the plane of the substrate
- FIG. 4(b) shows the structure of the multiplexer viewed from the side of the substrate.
- Output lights from the light source chips 111a to 111d mounted on the light source for each wavelength channel are input to the optical multiplexer 120 via the collimator lenses 131a to 131d and the beam splitter 151, and multiplexed.
- the output of the optical multiplexer 120 passes through the condensing lens 132 as wavelength-multiplexed light, in which all wavelength channels are multiplexed and coupled to the optical fiber 141 .
- a part of the output light from the light source chips 111a-111d is split by the beam splitter 151, and the optical power of each output light is monitored by the monitor PDs 153a-153d via the wavelength filters 152a-152d.
- the outputs of the monitor PDs 153a-153d are input to the control circuit of the light source, and the amount of current supplied to the light source chip 111 is adjusted so that the detected current value becomes constant, that is, the optical power of each output light becomes constant. to adjust.
- the beam splitter 151 can be, for example, a cube type in which the slopes of two rectangular prisms are combined with an optical thin film interposed therebetween.
- Embodiment 1 has an integrated structure capable of branching four channels collectively.
- Wavelength filters 152a-152d made of optical thin films are inserted between the beam splitter 151 and the monitor PDs 153a-153d, respectively.
- Each of the wavelength filters 152a-152d is an optical filter that transmits only the wavelengths of the light sources 111a-111d combined by the beam splitter 151, and transmits light in a specific wavelength band for each wavelength channel.
- the output light from the light source chip 111a is transmitted through the collimator lens 131a to become collimated light, and is input to the optical multiplexer 120 via the beam splitter 151, as indicated by the thin line in FIG. 4(a).
- a stray light component exceeding the effective diameter of the collimator lens 131a reaches the adjacent channel via the beam splitter 151, as indicated by the dashed line.
- this stray light component cannot pass through the adjacent channel wavelength filter 152b, it is not coupled to the adjacent channel monitor PD 153b. Therefore, crosstalk between adjacent channels can be suppressed when monitoring the optical output power.
- the output of the light source chip 111 for each wavelength channel was set to be +4 dBm, and when only a single wavelength channel was operated, the monitor PD 153 was The detected current value was measured.
- the current values for each wavelength channel 1 to 4 were 104, 101, 101 and 100 ⁇ A, respectively.
- the current values detected by the monitor PD 153 when four channels were operated simultaneously were measured, and 104, 101, 101 and 100 ⁇ A were obtained, respectively.
- the current value is higher when four channels are operated simultaneously than when a single wavelength channel is operated, and it can be seen that it is affected by crosstalk.
- Example 1 there is no change in the current value when a single wavelength channel is operated and when four channels are operated simultaneously, indicating that crosstalk between adjacent channels is suppressed. .
- FIG. 5 shows an example of a multi-channel optical module according to the second embodiment of the present invention, which is an optical transmitter that multiplexes four different wavelengths.
- FIG. 5(a) shows the structure of the multiplexer viewed from the plane of the substrate
- FIG. 5(b) shows the structure of the multiplexer viewed from the side of the substrate.
- Output lights from the light source chips 111a to 111d mounted on the light source for each wavelength channel are input to the optical multiplexer 120 via the collimator lenses 131a to 131d and the beam splitter 251, and multiplexed.
- the output of the optical multiplexer 120 passes through the condensing lens 132 as wavelength-multiplexed light, in which all wavelength channels are multiplexed and coupled to the optical fiber 141 .
- a part of the output light from the light source chips 111a-111d is split by the beam splitter 251, and the optical power of each output light is monitored by the monitor PDs 253a-253d.
- the outputs of the monitor PDs 253a-253d are input to the control circuit of the light source, and the amount of current supplied to the light source chip 111 is adjusted so that the detected current value becomes constant, that is, the optical power of each output light becomes constant. to adjust.
- the beam splitter 251 can be, for example, a cube type in which the slopes of two rectangular prisms are combined with an optical thin film interposed therebetween.
- the difference from the beam splitter 151 of Example 1 is that the optical thin film 252 formed on the slope is designed to split only the wavelengths of the light sources 111a-111d coupled via the collimator lenses 131a-131d. It is in. That is, the two rectangular prisms have a four-channel integrated structure, but different optical thin films 252 are formed for each wavelength channel.
- the stray light component from the light source chip 111a is not branched by the optical thin film 252 of the adjacent channel, so it is not coupled to the monitor PD 253b of the adjacent channel. Therefore, crosstalk between adjacent channels can be suppressed when monitoring the optical output power.
- the output of the light source chip 111 for each wavelength channel is set to +5 dBm, and when only a single wavelength channel is operated, the monitor PD 253 is The detected current value was measured.
- the current values for each wavelength channel 1 to 4 were 124, 121, 121 and 121 ⁇ A, respectively.
- the current values detected by the monitor PD 253 when four channels were operated simultaneously were measured, and 124, 122, 122 and 121 ⁇ A were obtained, respectively.
- the current value is higher when four channels are operated simultaneously than when a single wavelength channel is operated, and it can be seen that it is affected by crosstalk.
- Example 2 there is no change in the current value when a single wavelength channel is operated and when four channels are operated simultaneously, indicating that crosstalk between adjacent channels is suppressed. .
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Abstract
Description
Claims (2)
- 複数の波長チャネルを多重化して出力する多チャネル光モジュールであって、
各々が異なる波長の複数の光源と、
前記複数の光源の各々の出力に結合された複数のコリメータレンズと、
前記複数のコリメータレンズの各々の出力に結合されたビームスプリッタと、
前記ビームスプリッタから分岐された光パワーをモニタする複数のモニタPDと、
前記ビームスプリッタと前記複数のモニタPDの各々との間に挿入された波長フィルタであって、前記ビームスプリッタにより結合される光源の波長のみをそれぞれ透過する複数の波長フィルタと
を備えたことを特徴とする多チャネル光モジュール。 - 複数の波長チャネルを多重化して出力する多チャネル光モジュールであって、
各々が異なる波長の複数の光源と、
前記複数の光源の各々の出力に結合された複数のコリメータレンズと、
前記複数のコリメータレンズの各々の出力に結合されたビームスプリッタであって、各コリメータレンズを介して結合される光源の波長のみをそれぞれ分岐する複数の光学薄膜を含むビームスプリッタと、
前記ビームスプリッタから分岐された光パワーをモニタする複数のモニタPDと
を備えたことを特徴とする多チャネル光モジュール。
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JP2023529320A JPWO2022269805A1 (ja) | 2021-06-23 | 2021-06-23 | |
US18/566,003 US20240248319A1 (en) | 2021-06-23 | 2021-06-23 | Multi-Channel Optical Module |
PCT/JP2021/023794 WO2022269805A1 (ja) | 2021-06-23 | 2021-06-23 | 多チャネル光モジュール |
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PCT/JP2021/023794 WO2022269805A1 (ja) | 2021-06-23 | 2021-06-23 | 多チャネル光モジュール |
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Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2016178218A (ja) * | 2015-03-20 | 2016-10-06 | 日本オクラロ株式会社 | 光送信モジュール |
JP2017034310A (ja) * | 2015-07-28 | 2017-02-09 | 富士通オプティカルコンポーネンツ株式会社 | 光送信器および制御方法 |
JP2017098505A (ja) * | 2015-11-27 | 2017-06-01 | 富士通オプティカルコンポーネンツ株式会社 | 光モジュール |
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2021
- 2021-06-23 WO PCT/JP2021/023794 patent/WO2022269805A1/ja active Application Filing
- 2021-06-23 JP JP2023529320A patent/JPWO2022269805A1/ja active Pending
- 2021-06-23 US US18/566,003 patent/US20240248319A1/en active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2016178218A (ja) * | 2015-03-20 | 2016-10-06 | 日本オクラロ株式会社 | 光送信モジュール |
JP2017034310A (ja) * | 2015-07-28 | 2017-02-09 | 富士通オプティカルコンポーネンツ株式会社 | 光送信器および制御方法 |
JP2017098505A (ja) * | 2015-11-27 | 2017-06-01 | 富士通オプティカルコンポーネンツ株式会社 | 光モジュール |
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US20240248319A1 (en) | 2024-07-25 |
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