JP2000304985A - Bidirectional optical module - Google Patents
Bidirectional optical moduleInfo
- Publication number
- JP2000304985A JP2000304985A JP11388599A JP11388599A JP2000304985A JP 2000304985 A JP2000304985 A JP 2000304985A JP 11388599 A JP11388599 A JP 11388599A JP 11388599 A JP11388599 A JP 11388599A JP 2000304985 A JP2000304985 A JP 2000304985A
- Authority
- JP
- Japan
- Prior art keywords
- emitting element
- light emitting
- light
- light receiving
- receiving element
- Prior art date
- Legal status (The legal status 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 status listed.)
- Granted
Links
Landscapes
- Semiconductor Lasers (AREA)
- Optical Couplings Of Light Guides (AREA)
- Light Receiving Elements (AREA)
- Photo Coupler, Interrupter, Optical-To-Optical Conversion Devices (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、双方向光通信に用
いる、送信用及び受信用の光素子が一体となった光モジ
ュールに関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical module used for two-way optical communication, in which optical elements for transmission and reception are integrated.
【０００２】[0002]
【従来の技術】双方向光通信において、特に光ファイバ
１本で送受同時通信を行う双方向光通信に用いられる双
方向光モジュールがある。双方向光モジュールとは、送
信光を発生するレーザダイオード（ＬＤ）等の発光素子
と、受信光を受信するフォトダイオード（ＰＤ）などの
受光素子を有し、光信号の送信機能と受信機能を併せ持
つ構造のものである。2. Description of the Related Art In bidirectional optical communication, there is a bidirectional optical module used for bidirectional optical communication in which simultaneous transmission / reception is performed with one optical fiber. The bidirectional optical module has a light emitting element such as a laser diode (LD) that generates transmission light and a light receiving element such as a photodiode (PD) that receives reception light, and has a function of transmitting and receiving an optical signal. It has a combined structure.
【０００３】従来の双方向光モジュールは、例えば図５
に示すように、波長λ１の送信光を放射するＬＤ等の発
光素子１１と、ＰＤ等の受光素子６１とを筐体８に固定
し、また光信号を導出、導入する光ファイバ４の一端を
フェルール４１を用いて筐体８に固定し、筐体３内には
分波フィルタ３と送信側集光レンズ２、受光側集光レン
ズ５を備えてなるものである。A conventional bidirectional optical module is, for example, shown in FIG.
As shown in (1), a light emitting element 11 such as an LD that emits transmission light of wavelength λ1 and a light receiving element 61 such as a PD are fixed to a housing 8, and one end of an optical fiber 4 for deriving and introducing an optical signal is connected. The housing 3 is fixed to the housing 8 using a ferrule 41, and the housing 3 includes the demultiplexing filter 3, the transmission-side condenser lens 2, and the light-receiving-side condenser lens 5.
【０００４】この双方向光モジュールでは、発光素子１
１から出射された波長λ１の光信号は送信側集光レンズ
２を介して分波フィルタ３を通過し、光ファイバ４から
導出される。一方、光ファイバ４を通過してきた波長λ
２の受信光に対しては、反射する成分を持つ分波フィル
タ３で反射され、受光側集光レンズ５により波長λ２に
対して感度のある受光素子６１に導かれるという構成を
持っている。In this bidirectional optical module, the light emitting element 1
The optical signal of wavelength λ1 emitted from 1 passes through the demultiplexing filter 3 via the transmission side condenser lens 2 and is led out of the optical fiber 4. On the other hand, the wavelength λ passing through the optical fiber 4
The second received light is reflected by the demultiplexing filter 3 having a reflected component, and guided by the light receiving side condenser lens 5 to the light receiving element 61 sensitive to the wavelength λ2.
【０００５】駆動の方式は、伝送方式により様々な方式
が取られるが、送信信号と受信信号を時間で区切って交
互に行う場合と、送信信号と受信信号で異なった光の波
長を用いて、同時に送受信を行う場合がある。送信信号
と受信信号を交互に行う場合送信時には発光素子１１を
駆動させる間、受光素子６１を停止させておき、逆に受
信時には受信機能を有する受光素子６１を駆動させてい
る間は、発光素子１１を停止させておく。また、送受信
を同時に行う場合には、発光素子１１と受光素子６１を
常時、同時に駆動させておく必要がある。[0005] There are various driving schemes depending on the transmission scheme. A transmission signal and a reception signal are alternately separated by time and a transmission signal and a reception signal use different light wavelengths. Transmission and reception may be performed at the same time. When the transmission signal and the reception signal are alternately performed, the light receiving element 61 is stopped while the light emitting element 11 is driven during transmission, and the light emitting element is driven while the light receiving element 61 having the receiving function is driven during reception. 11 is stopped. When transmitting and receiving are performed simultaneously, the light emitting element 11 and the light receiving element 61 need to be constantly driven at the same time.
【０００６】上記発光素子１１、受光素子６１はそれぞ
れ金属製のステム１２、６２に固定され、このステム１
２、６２と筐体８の間に、金属製のリング状スペーサ
７、９を介在させ、ＹＡＧ溶接や半田付け等の手段によ
って固定されている。組立固定作業をＹＡＧ溶接や半田
付けによって実施する都合上、これらの筐体８やスペー
サ７、９は、通常金属材により構成されている。The light emitting element 11 and the light receiving element 61 are fixed to metal stems 12 and 62, respectively.
Metal ring-shaped spacers 7 and 9 are interposed between the casings 2 and 62 and the housing 8, and are fixed by means such as YAG welding or soldering. The housing 8 and the spacers 7 and 9 are usually made of a metal material because the assembly and fixing operation is performed by YAG welding or soldering.
【０００７】また、上記発光素子１１と受光素子６１の
接地端子は、それぞれステム１２、６２を介して筐体８
に接続され、筐体８部分で共通に接地する構造となって
いた。The ground terminals of the light emitting element 11 and the light receiving element 61 are connected to the casing 8 via the stems 12 and 62, respectively.
And grounded in common at the housing 8.
【０００８】[0008]
【発明が解決しようとする課題】近年、光通信の分野に
て高速、高密度通信が求められており、このような双方
向光モジュールに求められる特性も厳しくなっている。
これに伴い、上記双方向光モジュールにおいて、特に駆
動方式として送受信素子の両方とも駆動させる場合に、
送信側の発光素子１１に与えられる電気信号が、スペー
サ７、９や筐体８を伝わり、受信側の受光素子６１に雑
音として悪影響を与えてしまうという問題点が見いださ
れた。その結果、特に受信側の最小受光感度が劣化して
しまい、十分な受信特性が得られないという問題点があ
った。In recent years, high-speed, high-density communication has been required in the field of optical communication, and the characteristics required of such a bidirectional optical module have become severe.
Along with this, in the bidirectional optical module, particularly when both the transmitting and receiving elements are driven as a driving method,
It has been found that an electric signal given to the light emitting element 11 on the transmitting side propagates through the spacers 7 and 9 and the housing 8 and adversely affects the light receiving element 61 on the receiving side as noise. As a result, there is a problem that the minimum light receiving sensitivity particularly on the receiving side deteriorates, and sufficient receiving characteristics cannot be obtained.
【０００９】本発明は、上述した双方向光モジュールの
問題点を解決し、容易かつ現実的な手段で、特性に優れ
た双方向光モジュールを提供する事を目的としている。An object of the present invention is to solve the above-mentioned problems of the bidirectional optical module and to provide a bidirectional optical module having excellent characteristics by easy and practical means.
【００１０】[0010]
【課題を解決するための手段】上記従来の問題点を解決
するため、本発明は、発光素子と受光素子を筐体に固定
し、光ファイバを通じて光信号の送受信同時通信を行う
双方向光モジュールにおいて、上記発光素子と受光素子
の間に絶縁スペーサを介在させたことを特徴とする。SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention provides a bidirectional optical module in which a light-emitting element and a light-receiving element are fixed to a housing and simultaneous transmission and reception of optical signals is performed through an optical fiber. Wherein an insulating spacer is interposed between the light emitting element and the light receiving element.
【００１１】[0011]
【発明の実施の形態】以下、本発明の実施形態を図面に
基づいて詳細に説明する。Embodiments of the present invention will be described below in detail with reference to the drawings.
【００１２】図１は、本発明による双方向光モジュール
の１実施形態を示す。金属製の筐体８に、発光素子１１
としてレーザダイオード（ＬＤ）と、受光素子６１とし
てフォトダイオード（ＰＤ）を、互いの光軸が直交する
ように配置し、送受信の光信号の分離体として分波フィ
ルタ３を、互いの光軸に対して４５度傾けた状態で備
え、発光素子１１の光軸方向に光ファイバ４を保持した
フェルール４１を配置してある。FIG. 1 shows an embodiment of a bidirectional optical module according to the present invention. The light emitting element 11 is mounted on the metal housing 8.
A laser diode (LD) and a photodiode (PD) as a light receiving element 61 are arranged so that their optical axes are orthogonal to each other. A ferrule 41 holding the optical fiber 4 in the direction of the optical axis of the light emitting element 11 is disposed in a state of being inclined at 45 degrees to the light emitting element 11.
【００１３】発光素子１１から出射された波長λ１の送
信光は送信側集光レンズ２及び分波フィルタ３を通過し
光ファイバ４により導出される。また、光ファイバ４か
ら導入された波長λ２の受信光は分波フィルタ３によっ
て反射し、この反射した受信光が受光素子６１に入射す
る事になり、これによって双方向の光通信が可能とな
る。The transmission light of wavelength λ 1 emitted from the light emitting element 11 passes through the transmission side condenser lens 2 and the demultiplexing filter 3 and is led out by the optical fiber 4. The received light of wavelength λ2 introduced from the optical fiber 4 is reflected by the demultiplexing filter 3, and the reflected received light is incident on the light receiving element 61, thereby enabling bidirectional optical communication. .
【００１４】発光素子１１、受光素子６１は、それぞれ
半田付けによってステム１２、６２に固定され、各ステ
ム１２、６２はリング状のスペーサ７、９を介して筐体
８に固定されている。ここで、発光素子１１側のスペー
サ７は金属製であるが、受光素子６１側のスペーサ９は
絶縁材で形成してある。The light emitting element 11 and the light receiving element 61 are fixed to the stems 12 and 62 by soldering, respectively, and the stems 12 and 62 are fixed to the housing 8 via ring-shaped spacers 7 and 9. Here, the spacer 7 on the light emitting element 11 side is made of metal, but the spacer 9 on the light receiving element 61 side is formed of an insulating material.
【００１５】そして、受光素子６１側のステム６２に接
地端子６３を備え、一方の発光素子１１側の接地端子は
ステム１２、スペーサ７を介して筐体８に接地端子８１
を備えている。A ground terminal 63 is provided on the stem 62 on the light receiving element 61 side, and the ground terminal 81 on the light emitting element 11 side is connected to the housing 8 via the stem 12 and the spacer 7.
It has.
【００１６】このような構造を取ることにより、絶縁材
からなるスペーサ９によって受光素子６１は発光素子１
１を含む送信光の発信部と電気的に完全に絶縁させるこ
とが可能となる。このため、発光素子１１が駆動しλ１
の信号光を送信している最中に、受信光λ２が受光素子
６１に入射された場合、送信側の発光素子１１に与えら
れる電気信号が、固定される筐体８を伝わっても、絶縁
材のスペーサ９で遮断されるため、受信側の受光素子６
１に雑音としてとして影響を及ぼすことを防止できる。
その結果、受信側の受講素子６１は雑音の影響を受けず
に良好な受光感度を持って受信特性を得ることが出来
る。By adopting such a structure, the light receiving element 61 can be connected to the light emitting element 1 by the spacer 9 made of an insulating material.
1 can be completely electrically insulated from the transmitting section of the transmitting light including the light emitting element 1. For this reason, the light emitting element 11 is driven and λ1
When the received light λ2 is incident on the light receiving element 61 during the transmission of the signal light, the electric signal given to the light emitting element 11 on the transmission side is transmitted through the fixed housing 8 even if it is insulated. The light receiving element 6 on the receiving side is blocked by the material spacer 9.
1 can be prevented from being affected as noise.
As a result, the receiving element 61 on the receiving side can obtain reception characteristics with good light receiving sensitivity without being affected by noise.
【００１７】上記の作用を成すためには、スペーサ９を
成す絶縁材として体積固有抵抗が１０12Ω・ｃｍ以上の
セラミックス、ガラス、樹脂あるいはこれらの複合材を
用いることが好ましい。In order to achieve the above-mentioned effect, it is preferable to use ceramics, glass, resin or a composite material having a volume resistivity of 10 12 Ω · cm or more as an insulating material forming the spacer 9.
【００１８】また、このスペーサ９は、受光素子６１と
レンズ５間の距離を一定に保って筐体８に固定するため
のものであることから、スペーサ９を成す絶縁材として
は、高剛性であり熱膨張係数が小さいものが好ましく、
これらの点からセラミックスが最適である。具体的に
は、剛性（ヤング率）が２００ＧＰａ以上、熱膨張係数
（４０〜４００℃）が１１×１０-6／℃以下のセラミッ
クスが好ましい。Further, since the spacer 9 is for fixing the distance between the light receiving element 61 and the lens 5 to the housing 8 while keeping the distance constant, the insulating material forming the spacer 9 has high rigidity. It is preferable that the thermal expansion coefficient is small,
From these points, ceramics are most suitable. Specifically, ceramics having a rigidity (Young's modulus) of 200 GPa or more and a thermal expansion coefficient (40 to 400 ° C.) of 11 × 10 −6 / ° C. or less are preferable.
【００１９】このようなセラミックスとしては、アルミ
ナ、ジルコニア、窒化珪素、窒化アルミニウム等を主成
分とし、それぞれ所定の焼結助剤を添加し焼成したもの
を用いる。これらの中でも、特に、ジルコニアを主成分
とし、イットリア、カルシア、マグネシア、セリアなど
の一種以上を安定化剤として含有させることによって正
方晶の結晶を主体とした部分安定化ジルコニアセラミッ
クスを用いれば、強度が高く最適である。As such a ceramic, a ceramic mainly composed of alumina, zirconia, silicon nitride, aluminum nitride or the like, each of which is added with a predetermined sintering aid and fired is used. Among these, in particular, the use of partially stabilized zirconia ceramics mainly composed of tetragonal crystals by containing zirconia as a main component and containing at least one of yttria, calcia, magnesia, ceria, etc. as a stabilizing agent, provides a high strength. Is high and optimal.
【００２０】上記セラミックスを用いてスペーサ９を構
成すれば、確実に絶縁作用を成すとともに、剛性が高い
ことから変形しにくく、熱膨張係数が小さいことから熱
変形もしにくい。その結果、受光素子６１と受光側集光
レンズ５との距離を常に一定に保つことができ、高精度
の光モジュールとすることができる。When the spacers 9 are formed using the above ceramics, the spacers 9 reliably function as insulation, and are hardly deformed due to high rigidity, and are not easily deformed due to small thermal expansion coefficients. As a result, the distance between the light receiving element 61 and the light receiving side condenser lens 5 can always be kept constant, and a highly accurate optical module can be obtained.
【００２１】また、セラミックス等の絶縁材からなるス
ペーサ９とステム６２、筐体８との間の接合はエポキシ
系等の接着剤て固定する。The joint between the spacer 9 made of an insulating material such as ceramics, the stem 62, and the housing 8 is fixed with an adhesive such as epoxy.
【００２２】次に他の実施形態を示す。Next, another embodiment will be described.
【００２３】図２は、発光素子１１を搭載するステム１
２と筐体８間に絶縁材からなるリング状のスペーサ７を
介在させ、受光素子６１側のスペーサ９は金属材で形成
したものであり、この場合も、受光素子６１への送信部
からの電気的雑音の侵入を遮断することが出来る。FIG. 2 shows a stem 1 on which a light emitting element 11 is mounted.
A ring-shaped spacer 7 made of an insulating material is interposed between the housing 2 and the housing 8, and the spacer 9 on the light receiving element 61 side is formed of a metal material. Intrusion of electrical noise can be blocked.
【００２４】さらに図３に示すように、受光素子６１側
と発光素子１１側の両方に絶縁材かなるスペーサ７、９
を介在させれば電気的雑音を遮断する効果をより高くす
ることができる。Further, as shown in FIG. 3, spacers 7, 9 made of an insulating material are provided on both the light receiving element 61 side and the light emitting element 11 side.
The effect of blocking the electrical noise can be further enhanced by interposing.
【００２５】また、図４に示すように、筐体８そのもの
を絶縁材料で構成することによっても、受光素子６１へ
の送信部からの電気的雑音の侵入を遮断することが出来
る。この場合は筐体８が絶縁スペーサを兼用することと
なる。Also, as shown in FIG. 4, the intrusion of electrical noise from the transmitting section into the light receiving element 61 can be blocked by forming the housing 8 itself from an insulating material. In this case, the housing 8 also serves as an insulating spacer.
【００２６】以上の図２〜４に示す実施形態において用
いる絶縁材としては、図１に示す実施形態と同様であ
る。また、これらの実施形態においても、発光素子１１
側と受光素子６１側とのそれぞれの接地端子を異ならせ
てある。The insulating material used in the embodiment shown in FIGS. 2 to 4 is the same as that in the embodiment shown in FIG. Also in these embodiments, the light emitting element 11
The ground terminals of the side and the light receiving element 61 are different from each other.
【００２７】[0027]
【発明の効果】以上のように本発明によれば、発光素子
と受光素子を筐体に固定し、光ファイバを通じて光信号
の送受信同時通信を行う双方向光モジュールにおいて、
上記発光素子と受光素子の間に絶縁スペーサを介在させ
たことによって、受光素子側への電気的雑音の伝達を防
止し、送受信特性に優れた双方向通信用光モジュールを
提供することが出来る。特に、受信特性に優れ最小受光
感度に優れた送受信同時駆動に適した双方向光モジュー
ルを作製することが可能となった。As described above, according to the present invention, there is provided a bidirectional optical module in which a light-emitting element and a light-receiving element are fixed to a housing and a simultaneous transmission and reception of an optical signal is performed through an optical fiber.
By interposing an insulating spacer between the light emitting element and the light receiving element, transmission of electrical noise to the light receiving element side can be prevented, and an optical module for bidirectional communication excellent in transmission / reception characteristics can be provided. In particular, it has become possible to manufacture a bidirectional optical module that is excellent in receiving characteristics and excellent in minimum light receiving sensitivity and suitable for simultaneous transmission and reception.
【図１】本発明の双方向光モジュールを示す断面図であ
る。FIG. 1 is a sectional view showing a bidirectional optical module according to the present invention.
【図２】本発明の双方向光モジュールの他の実施形態を
示す断面図である。FIG. 2 is a sectional view showing another embodiment of the bidirectional optical module of the present invention.
【図３】本発明の双方向光モジュールの他の実施形態を
示す断面図である。FIG. 3 is a sectional view showing another embodiment of the bidirectional optical module of the present invention.
【図４】本発明の双方向光モジュールの他の実施形態を
示す断面図である。FIG. 4 is a sectional view showing another embodiment of the bidirectional optical module of the present invention.
【図５】従来の双方向光モジュールを示す断面図であ
る。FIG. 5 is a sectional view showing a conventional bidirectional optical module.
１１：発光素子 １２、６２：ステム ２、５：レンズ ３：分波フィルタ ４：光ファイバ ４１：フェルール ６１：受光素子 ７、９：スペーサ ８：筐体 λ１：送信光 λ２：受信光 11: Light emitting element 12, 62: Stem 2, 5: Lens 3: Demultiplexing filter 4: Optical fiber 41: Ferrule 61: Light receiving element 7, 9: Spacer 8: Housing λ1: Transmitted light λ2: Received light
Claims (4)
ァイバを通じて光信号の送受信同時通信を行う双方向光
モジュールにおいて、上記発光素子と受光素子の間に絶
縁スペーサを介在させたことを特徴とする双方向光モジ
ュール。1. A bidirectional optical module in which a light emitting element and a light receiving element are fixed to a housing and an optical signal is transmitted and received simultaneously through an optical fiber, wherein an insulating spacer is interposed between the light emitting element and the light receiving element. A bidirectional optical module characterized by the above-mentioned.
の間に、リング状の絶縁スペーサを介在させたことを特
徴とする請求項１記載の双方向光モジュール。2. The bidirectional optical module according to claim 1, wherein a ring-shaped insulating spacer is interposed between the light emitting element and / or the light receiving element and the housing.
ことを特徴とする請求項１記載の双方向光モジュール。3. The bidirectional optical module according to claim 1, wherein said insulating spacer is made of ceramic.
る接地端子を有することを特徴とする請求項１記載の双
方向光モジュール。4. The bidirectional optical module according to claim 1, wherein said light emitting element and said light receiving element have different ground terminals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11388599A JP3898375B2 (en) | 1999-04-21 | 1999-04-21 | Bidirectional optical module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11388599A JP3898375B2 (en) | 1999-04-21 | 1999-04-21 | Bidirectional optical module |
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| Publication Number | Publication Date |
|---|---|
| JP2000304985A true JP2000304985A (en) | 2000-11-02 |
| JP3898375B2 JP3898375B2 (en) | 2007-03-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11388599A Expired - Fee Related JP3898375B2 (en) | 1999-04-21 | 1999-04-21 | Bidirectional optical module |
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| JP (1) | JP3898375B2 (en) |
Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030064517A (en) * | 2002-01-28 | 2003-08-02 | 이근우 | Bi-directional tranceiver module |
| JP2006351566A (en) * | 2005-06-13 | 2006-12-28 | Sharp Corp | Nitride-based semiconductor laser element |
| WO2007029920A1 (en) * | 2005-07-26 | 2007-03-15 | Electronics And Telecommunications Research Institute | Bi-directional optical module |
| JP2007072384A (en) * | 2005-09-09 | 2007-03-22 | Mitsubishi Electric Corp | Light transmitting and receiving device |
| JP2007286085A (en) * | 2006-04-12 | 2007-11-01 | Alps Electric Co Ltd | Optical transmission/reception module |
| JP2011150082A (en) * | 2010-01-20 | 2011-08-04 | Hitachi Cable Ltd | Optical module |
| JP2017157871A (en) * | 2012-11-28 | 2017-09-07 | 浜松ホトニクス株式会社 | Single core optical transceiver |
| JP2018197849A (en) * | 2017-03-24 | 2018-12-13 | ルマセンス テクノロジーズ ホールディングズ， インク． | Bidirectional optoelectronic sub-assembly |
| JP2021524613A (en) * | 2018-07-12 | 2021-09-13 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Bases, optical transceivers, optical modules, and communication devices |
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1999
- 1999-04-21 JP JP11388599A patent/JP3898375B2/en not_active Expired - Fee Related
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20030064517A (en) * | 2002-01-28 | 2003-08-02 | 이근우 | Bi-directional tranceiver module |
| JP2006351566A (en) * | 2005-06-13 | 2006-12-28 | Sharp Corp | Nitride-based semiconductor laser element |
| WO2007029920A1 (en) * | 2005-07-26 | 2007-03-15 | Electronics And Telecommunications Research Institute | Bi-directional optical module |
| US7974539B2 (en) | 2005-07-26 | 2011-07-05 | Electronics And Telecommunications Research Institute | Bi-directional optical module |
| JP2007072384A (en) * | 2005-09-09 | 2007-03-22 | Mitsubishi Electric Corp | Light transmitting and receiving device |
| JP2007286085A (en) * | 2006-04-12 | 2007-11-01 | Alps Electric Co Ltd | Optical transmission/reception module |
| JP2011150082A (en) * | 2010-01-20 | 2011-08-04 | Hitachi Cable Ltd | Optical module |
| JP2017157871A (en) * | 2012-11-28 | 2017-09-07 | 浜松ホトニクス株式会社 | Single core optical transceiver |
| JP2018197849A (en) * | 2017-03-24 | 2018-12-13 | ルマセンス テクノロジーズ ホールディングズ， インク． | Bidirectional optoelectronic sub-assembly |
| JP2021524613A (en) * | 2018-07-12 | 2021-09-13 | 華為技術有限公司Ｈｕａｗｅｉ Ｔｅｃｈｎｏｌｏｇｉｅｓ Ｃｏ．，Ｌｔｄ． | Bases, optical transceivers, optical modules, and communication devices |
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|---|---|
| JP3898375B2 (en) | 2007-03-28 |
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