JPH05289120A - Optical waveguide device - Google Patents
Optical waveguide deviceInfo
- Publication number
- JPH05289120A JPH05289120A JP8740192A JP8740192A JPH05289120A JP H05289120 A JPH05289120 A JP H05289120A JP 8740192 A JP8740192 A JP 8740192A JP 8740192 A JP8740192 A JP 8740192A JP H05289120 A JPH05289120 A JP H05289120A
- Authority
- JP
- Japan
- Prior art keywords
- optical
- optical waveguide
- conversion element
- waveguide
- wavelength band
- 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.)
- Pending
Links
Landscapes
- Optical Integrated Circuits (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、短波長帯と長波長帯と
を送受する光通信システムの光導波路デバイスに関す
る。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical waveguide device of an optical communication system for transmitting and receiving a short wavelength band and a long wavelength band.
【０００２】光デバイスの進歩に伴い、短波長帯の一般
通話路と、ビデオ等の長波長帯の伝送路とを、一本の光
ファイバ線路で共用する図４に図示したような光ファイ
バ通信システムが使用されつつある。With the progress of optical devices, an optical fiber communication as shown in FIG. 4 in which a general communication path of a short wavelength band and a transmission path of a long wavelength band such as video are shared by one optical fiber line The system is being used.
【０００３】図４において、５は、局側光モジュール１
と加入者側光モジュール２とを接続する光ファイバであ
る。1-1 は、加入者からの短波長帯λ1 の光を受光し、
電気信号に変換する局側光モジュール１側に設置する光
電変換素子である。In FIG. 4, reference numeral 5 is a station side optical module 1.
And an optical fiber for connecting the optical module 2 on the subscriber side. 1-1 receives the light of the short wavelength band λ 1 from the subscriber,
It is a photoelectric conversion element installed on the side of the station side optical module 1 for converting into an electric signal.
【０００４】1-2 は、短波長帯λ1 の光を加入者に送信
する、局側第１の電光変換素子である。1-3 は、長波長
帯λ2 の光を加入者に送信する、局側第２の電光変換素
子である。Reference numeral 1-2 is a first station-side electro-optical conversion element that transmits light in the short wavelength band λ 1 to the subscriber. 1-3 are second station-side electro-optical conversion elements that transmit light in the long wavelength band λ 2 to the subscriber.
【０００５】11は、一方の面に、局側光電変換素子1-1
に光結合する局側第１の光導波路15-1に通ずるポート
と、局側第１の電光変換素子1-2 に光結合する局側第２
の光導波路15-2に通ずるポートとの２つのポートと、他
方の面に局側第３の光導波路15-3に通ずるポートを有す
る光カプラである。Numeral 11 indicates a photoelectric conversion element 1-1 on the station side on one side.
To the station-side first optical waveguide 15-1 which is optically coupled to the station-side first optical-optical conversion element 1-2 and to the station-side second optical waveguide 15-1.
The optical coupler has two ports, a port communicating with the optical waveguide 15-2, and a port communicating with the third optical waveguide 15-3 on the station side on the other surface.
【０００６】12は、一方の面に、局側第３の光導波路15
-3に通ずるポートと、局側第２の電光変換素子1-3 に光
結合する局側第４の光導波路15-4に通ずるポートとの２
つのポートと、他方の面に光ファイバ５に光結合する導
波路にに通ずるポートを有する光合分波器である。Numeral 12 denotes a third optical waveguide 15 on the station side on one surface.
-3 and a port leading to the station-side fourth optical waveguide 15-4 optically coupled to the station-side second electro-optical conversion element 1-3.
An optical multiplexer / demultiplexer having one port and a port communicating with a waveguide optically coupled to the optical fiber 5 on the other surface.
【０００７】上述の局側光電変換素子1-1 ，局側第１の
電光変換素子1-2 ，局側第２の電光変換素子1-3 ，光カ
プラ11, 光合分波器12, 局側第１の光導波路15-1, 局側
第２の光導波路15-2，局側第３の光導波路15-3，及び局
側第４の光導波路15-4とで、局側光モジュール１が構成
されている。The above-mentioned station side photoelectric conversion element 1-1, station side first electro-optical conversion element 1-2, station side second electro-optical conversion element 1-3, optical coupler 11, optical multiplexer / demultiplexer 12, station side The first optical waveguide 15-1, the second optical waveguide 15-2 on the station side, the third optical waveguide 15-3 on the station side, and the fourth optical waveguide 15-4 on the station side, Is configured.
【０００８】一方、2-1 は、短波長帯λ1 の光を局側に
送信する、加入者側光モジュール２側に設置する電光変
換素子である。2-2 は、局からの短波長帯λ1 の光を受
光し、電気信号に変換する第１の光電変換素子である。On the other hand, 2-1 is an electro-optical conversion element installed on the subscriber side optical module 2 side for transmitting light in the short wavelength band λ 1 to the station side. Reference numeral 2-2 is a first photoelectric conversion element that receives light in the short wavelength band λ 1 from the station and converts it into an electric signal.
【０００９】2-3 は、局からの長波長帯λ2 の光を受光
し、電気信号に変換する第２の光電変換素子である。21
は、一方の面に、電光変換素子2-1 に光結合する光導波
路25-1に通ずるポートと、第１の光電変換素子2-2 に光
結合する第２の光導波路25-2に通ずるポートとの２つの
ポートと、他方の面に第３の光導波路25-3に通ずるポー
トを有する光カプラである。Reference numeral 2-3 is a second photoelectric conversion element for receiving light in the long wavelength band λ 2 from the station and converting it into an electric signal. twenty one
On one side communicates with the port that leads to the optical waveguide 25-1 that optically couples to the electro-optical conversion element 2-1 and to the second optical waveguide 25-2 that optically couples to the first photoelectric conversion element 2-2. The optical coupler has two ports, a port and a port communicating with the third optical waveguide 25-3 on the other surface.
【００１０】22は、一方の面に、第３の光導波路25-3に
通ずるポートと、第２の光電変換素子2-3 に光結合する
第４の光導波路25-4に通ずるポートとの２つのポート
と、他方の面に光ファイバ５に光結合する導波路に通ず
るポートを有する光合分波器である。Reference numeral 22 designates, on one surface, a port communicating with the third optical waveguide 25-3 and a port communicating with the fourth optical waveguide 25-4 optically coupled to the second photoelectric conversion element 2-3. It is an optical multiplexer / demultiplexer having two ports and a port communicating with a waveguide optically coupled to the optical fiber 5 on the other surface.
【００１１】上述の電光変換素子2-1 ，第１の光電変換
素子2-2 ，第２の光電変換素子2-3，光カプラ21, 光合
分波器22, 第１の光導波路25-1, 第２の光導波路25-2，
第３の光導波路25-3，及び第４の光導波路25-4で、加入
者側光モジュール２が構成されている。The electro-optical conversion element 2-1, the first photoelectric conversion element 2-2, the second photoelectric conversion element 2-3, the optical coupler 21, the optical multiplexer / demultiplexer 22, and the first optical waveguide 25-1 described above. , The second optical waveguide 25-2,
The subscriber-side optical module 2 is composed of the third optical waveguide 25-3 and the fourth optical waveguide 25-4.
【００１２】したがって、局側第１の電光変換素子1-2
から発信される短波長帯λ1 の光は、局側第２の光導波
路15-2, 光カプラ11, 局側第３の光導波路15-3, 光合分
波器12を経て光ファイバ５に投入され、光ファイバ５か
ら出射して加入者側光モジュール２の光合分波器22に入
り、第３の光導波路25-3に進み、光カプラ21, 第２の光
導波路25-2を経て、第１の光電変換素子2-2 に入射す
る。Therefore, the station-side first electro-optical conversion element 1-2
The light in the short wavelength band λ 1 emitted from the optical fiber 5 passes through the second optical waveguide 15-2 on the station side, the optical coupler 11, the third optical waveguide 15-3 on the station side, and the optical multiplexer / demultiplexer 12 to the optical fiber 5. It is input, emitted from the optical fiber 5, enters the optical multiplexer / demultiplexer 22 of the optical module 2 on the subscriber side, proceeds to the third optical waveguide 25-3, and passes through the optical coupler 21 and the second optical waveguide 25-2. , Is incident on the first photoelectric conversion element 2-2.
【００１３】また、局側第２の電光変換素子1-3 から発
信される長波長帯λ2 の光は、局側第４の光導波路15-
4, 光合分波器12を経て光ファイバ５に投入され、光フ
ァイバ５から出射して加入者側光モジュール２の光合分
波器22に入り、第４の光導波路25-4に進み、第２の光電
変換素子2-3 に入射する。The light in the long wavelength band λ 2 emitted from the second electro-optical conversion element 1-3 on the station side is the fourth optical waveguide 15- on the station side.
4, it is input into the optical fiber 5 via the optical multiplexer / demultiplexer 12, is emitted from the optical fiber 5, enters the optical multiplexer / demultiplexer 22 of the subscriber side optical module 2, and proceeds to the fourth optical waveguide 25-4, The light enters the second photoelectric conversion element 2-3.
【００１４】一方、加入者側光モジュール２の電光変換
素子2-1 から発信される、短波長帯λ1 の光は、第１の
光導波路25-1, 光カプラ21, 第３の光導波路25-3, 光合
分波器22を経て光ファイバ５に投入され、光ファイバ５
から出射して局側光モジュール１の光合分波器12に入
り、局側第３の光導波路15-3に進み、光カプラ11, 局側
第１の光導波路15-1を経て、局側光電変換素子1-1 に入
射する。On the other hand, the light of the short wavelength band λ 1 emitted from the electro-optical conversion element 2-1 of the subscriber side optical module 2 is the first optical waveguide 25-1, the optical coupler 21 and the third optical waveguide. 25-3, input to the optical fiber 5 via the optical multiplexer / demultiplexer 22,
Exits from the optical path and enters the optical multiplexer / demultiplexer 12 of the optical module 1 on the station side, proceeds to the third optical waveguide 15-3 on the station side, passes through the optical coupler 11, the first optical waveguide 15-1 on the station side, and then to the station side. It is incident on the photoelectric conversion element 1-1.
【００１５】このように構成された局側光モジュール,
及び加入者側光モジュールは小型化, 低コスト化が要求
されている。A station side optical module configured as described above,
Moreover, the optical module on the subscriber side is required to be compact and low in cost.
【００１６】[0016]
【従来の技術】図５は、従来の加入者側光モジュールの
構成図である。図５において、2-1 は、短波長帯λ1 の
光信号を局側に送信する、加入者側光モジュール２側に
設置する電光変換素子である。2. Description of the Related Art FIG. 5 is a block diagram of a conventional subscriber side optical module. In FIG. 5, 2-1 is an electro-optical conversion element installed on the subscriber side optical module 2 side for transmitting an optical signal in the short wavelength band λ 1 to the station side.
【００１７】2-2 は、局からの短波長帯λ1 の光を受光
し、電気信号に変換する第１の光電変換素子である。2-
3 は、局からの長波長帯λ2 の光を受光し、電気信号に
変換する第２の光電変換素子である。Reference numeral 2-2 is a first photoelectric conversion element for receiving light in the short wavelength band λ 1 from the station and converting it into an electric signal. 2-
Reference numeral 3 is a second photoelectric conversion element that receives light in the long wavelength band λ 2 from the station and converts it into an electric signal.
【００１８】20は、シリコン基板等よりなる光回路基板
である。このような光回路基板20は、石英導波路を形成
することで、所望の導波路，及び導波路型の光カプラ，
光合分波器等を形成することができる。Reference numeral 20 is an optical circuit board made of a silicon substrate or the like. Such an optical circuit board 20 has a desired waveguide and a waveguide type optical coupler by forming a quartz waveguide.
An optical multiplexer / demultiplexer or the like can be formed.
【００１９】光回路基板20の一方の側面寄りの表面に、
電光変換素子2-1 に光結合する第１の光導波路25-1、第
１の光電変換素子2-2 に光結合する第２の光導波路25-
2、及び第２の光電変換素子2-3 に光結合する第４の光
導波路25-4が、並列して形成されている。On the surface of one side of the optical circuit board 20,
A first optical waveguide 25-1 optically coupled to the electro-optical conversion element 2-1 and a second optical waveguide 25-optically coupled to the first photoelectric conversion element 2-2.
2, and a fourth optical waveguide 25-4 optically coupled to the second photoelectric conversion element 2-3 is formed in parallel.
【００２０】光回路基板20の他方の側面寄りの表面に、
光ファイバ５に光結合する基幹光導波路25-0が形成され
ている。そして、基幹光導波路25-0を分岐して、一方に
第３の光導波路25-3を、他方に前述の第４の光導波路25
-4を設けている。On the other side surface of the optical circuit board 20,
A basic optical waveguide 25-0 that is optically coupled to the optical fiber 5 is formed. Then, the backbone optical waveguide 25-0 is branched so that the third optical waveguide 25-3 is provided on one side and the fourth optical waveguide 25-3 is provided on the other side.
-4 is provided.
【００２１】また、第３の光導波路25-3を分岐して、一
方に前述の第１の光導波路25-1を、他方に前述の第２の
光導波路25-2を設けている。そして、基幹光導波路25-
0, 第３の光導波路25-3, 第４の光導波路25-4が構成す
る三叉路部分に、光合分波器（導波路型の方向性結合器
又はマッハツェンダ型合分波器）を設けている。Further, the third optical waveguide 25-3 is branched, and the above-mentioned first optical waveguide 25-1 is provided on one side and the above-mentioned second optical waveguide 25-2 is provided on the other side. And the core optical waveguide 25-
0, an optical multiplexer / demultiplexer (a waveguide type directional coupler or a Mach-Zehnder type multiplexer / demultiplexer) is provided at the three-way portion formed by the third optical waveguide 25-3 and the fourth optical waveguide 25-4. There is.
【００２２】また、第３の光導波路25-3，第２の光導波
路25-2，第１の光導波路25-1が構成する三叉路部分は、
単に第３の光導波路25-3を第２の光導波路25-2と第１の
光導波路25-1とに分岐することで光カプラ21としてい
る。Further, the three-way portion formed by the third optical waveguide 25-3, the second optical waveguide 25-2, and the first optical waveguide 25-1 is
The optical coupler 21 is formed by simply branching the third optical waveguide 25-3 into the second optical waveguide 25-2 and the first optical waveguide 25-1.
【００２３】上述のように光合分波器22と光カプラ21と
を同一光回路基板20にモノリシックに設けた光導波路デ
バイスは、低コストである。ところで、上述の光合分波
器22は、短波長帯λ1 と長波長帯λ2 とに分波する波長
特性により、図５の点線で示すように長波長帯λ2 が第
３の光導波路25-3側に漏れて、光カプラ21, 第２の光導
波路25-2を経て第１の光電変換素子2-2 に入射する雑音
成分が存在する。The optical waveguide device in which the optical multiplexer / demultiplexer 22 and the optical coupler 21 are monolithically provided on the same optical circuit board 20 as described above is low in cost. By the way, the above-mentioned optical multiplexer / demultiplexer 22 uses the wavelength characteristic of demultiplexing into the short wavelength band λ 1 and the long wavelength band λ 2 so that the long wavelength band λ 2 is the third optical waveguide as shown by the dotted line in FIG. There is a noise component that leaks to the 25-3 side and is incident on the first photoelectric conversion element 2-2 via the optical coupler 21 and the second optical waveguide 25-2.
【００２４】このことを除去するために従来は、第３の
光導波路25-3の出射端側に、誘電体多層膜よりなる光フ
ィルタ30を配置して、長波長帯λ2 の通過を阻止し、短
波長帯λ1 のみを第１の光電変換素子2-2 に入射させて
いる。In order to eliminate this, conventionally, an optical filter 30 made of a dielectric multilayer film is arranged on the emission end side of the third optical waveguide 25-3 to prevent passage of the long wavelength band λ 2. However, only the short wavelength band λ 1 is made incident on the first photoelectric conversion element 2-2.
【００２５】[0025]
【発明が解決しようとする課題】しかしながら、光フィ
ルタは光学ガラスの表面に誘電体多層膜を設けたもので
あるから、光導波路の断面形状（例えば一辺が10μm の
角形) よりも非常に大きい。However, since the optical filter is one in which a dielectric multilayer film is provided on the surface of optical glass, it is much larger than the cross-sectional shape of the optical waveguide (for example, a square having a side of 10 μm).
【００２６】したがって、第１の光導波路25-1と第２の
光導波路25-2間、第２の光導波路25-2と第４の光導波路
25-4間のそれぞれの間隔を大きくすることになり、光導
波路デバイスが大形になるという問題点があった。Therefore, between the first optical waveguide 25-1 and the second optical waveguide 25-2, and between the second optical waveguide 25-2 and the fourth optical waveguide.
There has been a problem that the optical waveguide device becomes large in size because the interval between 25-4 is increased.
【００２７】また、光フィルタ30の透過光をレンズ（図
示省略) で集束して第１の光電変換素子2-2 に入射する
場合には、レンズを装着する領域だけ加入者側光モジュ
ールが大形になり、且つコスト高になるという問題点が
あった。When the transmitted light of the optical filter 30 is focused by a lens (not shown) and is incident on the first photoelectric conversion element 2-2, the optical module on the subscriber side is large only in the area where the lens is mounted. There was a problem that it became a shape and the cost was high.
【００２８】本発明はこのような点に鑑みて創作された
もので、長波長帯が漏れて第１の光電変換素子に入射す
る恐れがなく、且つ小型・低コストの光導波路デバイス
を提供することを目的としている。The present invention was made in view of the above points, and provides a small-sized and low-cost optical waveguide device in which there is no risk that a long wavelength band will leak and enter the first photoelectric conversion element. The purpose is to
【００２９】[0029]
【課題を解決するための手段】上記の目的を達成するた
めに本発明は、図１に図示したように、短波長帯λ1を
発振する電光変換素子2-1 、短波長帯λ1 を受光する第
１の光電変換素子2-2及び長波長帯λ2 を受光する第２
の光電変換素子2-3 とを有する加入者と、局との間に、
光ファイバ５を配線し光ファイバ５を介して、短波長帯
λ1 と長波長帯λ2 とを送受する光通信システムにおい
て、光ファイバ５に光結合する基幹光導波路25-0と、基
幹光導波路25-0が分岐してなる、一方の第３の光導波路
25-3及び光電変換素子2-3 に結合する他方の第４の光導
波路25-4と、第３の光導波路25-3が分岐してなる、電光
変換素子2-1 に結合する一方の第１の光導波路25-1、及
び第１の光電変換素子2-2 に結合する他方の第２の光導
波路25-2とを光回路基板20に設ける。The present invention in order to achieve the above object In order to achieve the above, as shown in FIG. 1, electro-optic conversion elements 2-1 to oscillate short wavelength band lambda 1, the short-wavelength band lambda 1 second for receiving the first photoelectric conversion elements 2-2 and long wavelength lambda 2 for receiving
Between the subscriber having the photoelectric conversion element 2-3 and the station,
In an optical communication system in which an optical fiber 5 is wired and a short wavelength band λ 1 and a long wavelength band λ 2 are transmitted and received via the optical fiber 5, a backbone optical waveguide 25-0 optically coupled to the optical fiber 5 and a backbone optical waveguide One of the third optical waveguides, in which the waveguide 25-0 is branched
25-3 and the photoelectric conversion element 2-3, the other fourth optical waveguide 25-4 and the third optical waveguide 25-3 are branched, and one of them is coupled to the electro-optical conversion element 2-1. The optical circuit board 20 is provided with the first optical waveguide 25-1 and the other second optical waveguide 25-2 that is coupled to the first photoelectric conversion element 2-2.
【００３０】そして、前者の３つの光導波路25-0,25-3,
25-4が構成する三叉路部に、光ファイバ５から伝送され
る光の短波長帯λ1 を第３の光導波路25-3に、長波長帯
λ2を第４の光導波路25-4に分波伝送する光合分波器22
を設ける。The former three optical waveguides 25-0, 25-3,
The short wavelength band λ 1 of the light transmitted from the optical fiber 5 is supplied to the third optical waveguide 25-3 and the long wavelength band λ 2 is supplied to the fourth optical waveguide 25-4 on the three-way path formed by 25-4. Optical multiplexer / demultiplexer 22 for demultiplexing transmission
To provide.
【００３１】また、後者の３つの光導波路25-3,25-2,25
-1が構成する三叉路部に、第２の光導波路25-2に対し
て、長波長帯λ2 では結合損失が大きい光方向性結合器
形カプラ40を設けた構成とする。The latter three optical waveguides 25-3, 25-2, 25
The optical directional coupler coupler 40 having a large coupling loss in the long wavelength band λ 2 is provided in the three-way portion formed by -1 with respect to the second optical waveguide 25-2.
【００３２】[0032]
【作用】本発明の光導波路デバイスは、長波長帯λ2 と
短波長帯λ1 に分波する光合分波器と、長波長帯λ2 で
は結合損失が大きい光方向性結合器形カプラとを同一の
光回路基板にモノリシックに形成したものである。The optical waveguide device of the present invention comprises an optical multiplexer / demultiplexer for demultiplexing into the long wavelength band λ 2 and the short wavelength band λ 1 , and an optical directional coupler type coupler having a large coupling loss in the long wavelength band λ 2. Are monolithically formed on the same optical circuit board.
【００３３】即ち、長波長帯λ2 と短波長帯λ1 とを伝
送する光ファイバと、第１の光電変換素子に光結合する
第２の光導波路との間には、長波長帯λ2 の通過を阻止
する２段の阻止手段が設けられているので、不要な長波
長帯λ2 の光が第１の光電変換素子に入射する雑音成分
が減少する。[0033] That is, an optical fiber for transmitting a long wavelength lambda 2 and the short wavelength band lambda 1, between the second optical waveguide optically coupled to the first photoelectric conversion element, long wavelength lambda 2 Since the two-stage blocking means for blocking the passage of light is provided, the noise component in which unnecessary light in the long wavelength band λ 2 enters the first photoelectric conversion element is reduced.
【００３４】よって、従来のように光回路基板の外に光
フィルタを設置する必要がない。Therefore, it is not necessary to install an optical filter outside the optical circuit board as in the conventional case.
【００３５】[0035]
【実施例】以下図を参照しながら、本発明を具体的に説
明する。なお、全図を通じて同一符号は同一対象物を示
す。The present invention will be described in detail with reference to the drawings. The same reference numerals denote the same objects throughout the drawings.
【００３６】図１は、本発明の構成図、図２は本発明の
実施例の要所詳細図で、(A) は平面図、(B) は断面図、
図３は本発明の光方向性結合器の波長特性図である。図
１において、光回路基板20の一方の側面寄りの表面に、
電光変換素子2-1 に光結合する第１の光導波路25-1、第
１の光電変換素子2-2 に光結合する第２の光導波路25-
2、及び第２の光電変換素子2-3 に光結合する第４の光
導波路25-4を、並列して設けている。FIG. 1 is a block diagram of the present invention, FIG. 2 is a detailed view of essential parts of an embodiment of the present invention, (A) is a plan view, (B) is a sectional view,
FIG. 3 is a wavelength characteristic diagram of the optical directional coupler according to the present invention. In FIG. 1, on the surface of one side of the optical circuit board 20,
A first optical waveguide 25-1 optically coupled to the electro-optical conversion element 2-1 and a second optical waveguide 25-optically coupled to the first photoelectric conversion element 2-2.
2, and a fourth optical waveguide 25-4 optically coupled to the second photoelectric conversion element 2-3 is provided in parallel.
【００３７】一方、光回路基板20の他方の側面寄りの表
面に、光ファイバ５に光結合する基幹光導波路25-0を設
けている。この基幹光導波路25-0を分岐して、一方に第
３の光導波路25-3を、他方に前述の第４の光導波路25-4
を形成している。On the other hand, a backbone optical waveguide 25-0 which is optically coupled to the optical fiber 5 is provided on the other side surface of the optical circuit board 20. This basic optical waveguide 25-0 is branched into one, the third optical waveguide 25-3, and the other the fourth optical waveguide 25-4.
Is formed.
【００３８】また、第３の光導波路25-3を分岐して、一
方に前述の第１の光導波路25-1を、他方に前述の第２の
光導波路25-2を形成している。そして、基幹光導波路25
-0, 第３の光導波路25-3, 第４の光導波路25-4が構成す
る三叉路部分に、光合分波器（導波路型の方向性結合器
又はマッハツェンダ型合分波器）22を設けて、光ファイ
バ５から入射する光の短波長帯λ1 を第３の光導波路25
-3に、長波長帯λ2 を第４の光導波路25-4に、それぞれ
分波伝送している。The third optical waveguide 25-3 is branched to form the above-mentioned first optical waveguide 25-1 on one side and the above-mentioned second optical waveguide 25-2 on the other side. And the core optical waveguide 25
-0, an optical multiplexer / demultiplexer (waveguide-type directional coupler or Mach-Zehnder-type multiplexer / demultiplexer) 22 is provided at the three-way portion formed by the third optical waveguide 25-3 and the fourth optical waveguide 25-4. By providing the short wavelength band λ 1 of the light incident from the optical fiber 5, the third optical waveguide 25
-3, the long wavelength band λ 2 is demultiplexed and transmitted to the fourth optical waveguide 25-4.
【００３９】さらにまた、第３の光導波路25-3，第２の
光導波路25-2，第１の光導波路25-1が構成する三叉路部
分に、第２の光導波路25-2に対して、長波長帯λ2 で結
合損失が大きい光方向性結合器形カプラ40を設けて、第
３の光導波路25-3に漏れ進行した長波長帯λ2 が第１の
光電変換素子2-2 に入射するのを阻止している。Furthermore, the third optical waveguide 25-3, the second optical waveguide 25-2, and the first optical waveguide 25-1 form a three-forked portion, which is different from the second optical waveguide 25-2. The optical directional coupler type coupler 40 having a large coupling loss in the long wavelength band λ 2 is provided, and the long wavelength band λ 2 that has progressed to the third optical waveguide 25-3 is the first photoelectric conversion element 2-2. Is blocked from entering.
【００４０】そして、第１の光導波路25-1の入射端（即
ち光回路基板20の端面に）に、電光変換素子2-1 を設置
し、第２の光導波路25-2の出射端、即ち光回路基板20の
端面に第１の光電変換素子2-2 の受光面を対向配置し、
第４の光導波路25-4の出射端、即ち光回路基板20の端面
に第２の光電変換素子2-3 の受光面を対向配置してい
る。Then, the electro-optical conversion element 2-1 is installed at the incident end of the first optical waveguide 25-1 (that is, at the end face of the optical circuit board 20), and the emitting end of the second optical waveguide 25-2 is That is, the light receiving surface of the first photoelectric conversion element 2-2 is arranged to face the end surface of the optical circuit board 20,
The light receiving surface of the second photoelectric conversion element 2-3 is arranged opposite to the emission end of the fourth optical waveguide 25-4, that is, the end surface of the optical circuit board 20.
【００４１】なお、それぞれの光導波路と電光変換素子
2-1 ，第１の光電変換素子2-2 ，第２の光電変換素子2-
3 を、直接光結合することなく光ファイバを介して光結
合させても良い。Each optical waveguide and electro-optical conversion element
2-1, first photoelectric conversion element 2-2, second photoelectric conversion element 2-
3 may be optically coupled via an optical fiber without being directly optically coupled.
【００４２】以下、本発明に係わる光方向性結合器形カ
プラ40を、図２，図３を参照しながら詳述する。図２に
図示したように、第３の光導波路25-3と第１の光導波路
25-1との接続部を逆台形に折り曲げて、コア線路41を設
けるとともに、第２の光導波路25-2の入射端側を台形に
折り曲げて、コア線路41に近接して平行するコア線路42
を設けることで、光方向性結合器形カプラとしている。The optical directional coupler 40 according to the present invention will be described in detail below with reference to FIGS. As shown in FIG. 2, the third optical waveguide 25-3 and the first optical waveguide 25-3
A core line 41 is formed by bending the connection part with 25-1 into an inverted trapezoid to provide a core line 41 and bending the incident end side of the second optical waveguide 25-2 into a trapezoid. 42
Is provided to form an optical directional coupler type coupler.
【００４３】このコア線路41,42 の構成の一例は、幅ｂ
が６μm 、高さａが６μm の角形で、長さＬが1.81mmで
あり、コア線路41とコア線路42との間隔ｄは、3.6 μm
である。An example of the structure of the core lines 41, 42 has a width b
Is 6 μm, the height a is 6 μm, the length L is 1.81 mm, and the distance d between the core line 41 and the core line 42 is 3.6 μm.
Is.
【００４４】なお、コア線路の屈折率は1.468 、クラッ
ド45の屈折率は1.457 である。このような光方向性結合
器形カプラ40の波長特性を図３に示す。図３の点線Ｐ-1
は、第３の光導波路25-3と第１の光導波路25-1との間の
結合損失と波長との関係を示し、実線Ｐ-2は第３の光導
波路25-3と第２の光導波路25-2との間の結合損失と波長
との関係を示す。The core line has a refractive index of 1.468, and the clad 45 has a refractive index of 1.457. The wavelength characteristics of such an optical directional coupler 40 are shown in FIG. Dotted line P-1 in FIG.
Indicates the relationship between the coupling loss between the third optical waveguide 25-3 and the first optical waveguide 25-1 and the wavelength, and the solid line P-2 indicates the third optical waveguide 25-3 and the second optical waveguide 25-3. The relationship between the coupling loss with the optical waveguide 25-2 and the wavelength is shown.
【００４５】光方向性結合器形カプラ40は図３のような
波長特性を有しているので、短波長帯λ1 を1.31μm を
中心とした波長帯を選択し、長波長帯λ2 を1.55μm を
中心とした波長帯を選択することで、第２の光導波路25
-2即ち第１の光電変換素子2-2 に、長波長帯λ2 の光の
侵入が阻止される。Since the optical directional coupler 40 has the wavelength characteristics as shown in FIG. 3, the short wavelength band λ 1 is selected as the wavelength band centered at 1.31 μm and the long wavelength band λ 2 is selected. By selecting the wavelength band centered around 1.55 μm, the second optical waveguide 25
-2, that is, the first photoelectric conversion element 2-2 is prevented from entering light in the long wavelength band λ 2 .
【００４６】本発明を光導波路デバイスを備えた加入者
側光モジュールは、上述のように構成されているので、
光ファイバ５から出射した短波長帯λ1,長波長帯λ2 の
光は、基幹光導波路25-0を経て光合分波器22に入り、短
波長帯λ1 と長波長帯λ2 とに分波される。Since the subscriber side optical module including the optical waveguide device of the present invention is constructed as described above,
Short wavelength band lambda 1 emitted from the optical fiber 5, the light of long wavelength lambda 2 enters the optical coupler 22 via the trunk optical waveguide 25-0, the short wavelength band lambda 1 and the long wavelength lambda 2 It is split.
【００４７】その結果、長波長帯λ2 の光は、第４の光
導波路25-4を進行して第２の光電変換素子2-3 に入射す
る。一方、短波長帯λ1 の光及び光合分波器22で漏れた
長波長帯λ2 の光は、第３の光導波路25-3に進み、光方
向性結合器形カプラ40を経て、短波長帯λ1 の光のみ
が、第２の光導波路25-2に進み第１の光電変換素子2-2
に入射する。As a result, the light in the long wavelength band λ 2 travels through the fourth optical waveguide 25-4 and enters the second photoelectric conversion element 2-3. On the other hand, the light in the short wavelength band λ 1 and the light in the long wavelength band λ 2 leaked by the optical multiplexer / demultiplexer 22 proceed to the third optical waveguide 25-3, pass through the optical directional coupler type coupler 40, and Only the light in the wavelength band λ 1 goes to the second optical waveguide 25-2 and the first photoelectric conversion element 2-2.
Incident on.
【００４８】なお、電光変換素子2-1 から発信された短
波長帯λ1 の光は、第１の光導波路25-1, 光方向性結合
器40, 第３の光導波路25-3, 光合分波器22, 基幹光導波
路25-0を経て、光ファイバ５に伝送される。The light in the short wavelength band λ 1 emitted from the electro-optical conversion element 2-1 is the light of the first optical waveguide 25-1, the optical directional coupler 40, the third optical waveguide 25-3, and the optical coupler. It is transmitted to the optical fiber 5 via the demultiplexer 22 and the backbone optical waveguide 25-0.
【００４９】本発明は上述のように構成されているの
で、第２の光導波路25-2の出射端、即ち光回路基板20の
端面に第１の光電変換素子2-2 の受光面を対向配置して
も、第１の光電変換素子2-2 に侵入する雑音成分が小さ
くなる。Since the present invention is configured as described above, the light receiving surface of the first photoelectric conversion element 2-2 is opposed to the emitting end of the second optical waveguide 25-2, that is, the end surface of the optical circuit board 20. Even with the arrangement, the noise component that enters the first photoelectric conversion element 2-2 becomes small.
【００５０】また、第１の光電変換素子2-2 でなくて、
光ファイバの端面を当接することもできる。なお、第１
の光導波路25-1の出射端に電光変換素子2-1 を、第４の
光導波路25-4の出射端に第２の光電変換素子2-3 をそれ
ぞれ直接配置することもできる。Further, instead of the first photoelectric conversion element 2-2,
It is also possible to abut the end faces of the optical fibers. The first
It is also possible to directly arrange the electro-optical conversion element 2-1 at the emission end of the optical waveguide 25-1 and the second photoelectric conversion element 2-3 at the emission end of the fourth optical waveguide 25-4.
【００５１】したがって、第１の光導波路25-1と第２の
光導波路25-2との間隔、及び第２の光導波路25-2と第４
の光導波路25-4との間隔を小さく（例えば300 μm ) し
て何ら支障がない。Therefore, the distance between the first optical waveguide 25-1 and the second optical waveguide 25-2, and the distance between the second optical waveguide 25-2 and the fourth optical waveguide 25-2.
The distance between the optical waveguide 25-4 and the optical waveguide 25-4 is made small (for example, 300 μm) without any trouble.
【００５２】即ち、光導波路デバイスが小型化されるば
かりでなく、低コストになる。That is, not only the optical waveguide device is downsized, but also the cost is reduced.
【００５３】[0053]
【発明の効果】以上説明したように、本発明は、長波長
帯と短波長帯に分波する光合分波器と、長波長帯では結
合損失が大きい光方向性結合器形カプラとを、光回路基
板にモノリシックに形成し、選択した所定の光電変換素
子に長波長帯の光が入射することを阻止した光導波路デ
バイスであって、光導波路デバイスの小型化, 低コスト
化が促進されるという、実用上で優れた効果を有する。As described above, the present invention provides an optical multiplexer / demultiplexer for demultiplexing into a long wavelength band and a short wavelength band, and an optical directional coupler type coupler having a large coupling loss in the long wavelength band, An optical waveguide device that is monolithically formed on an optical circuit board and blocks long-wavelength light from entering a selected photoelectric conversion element, facilitating downsizing and cost reduction of the optical waveguide device. That is, it has an excellent effect in practical use.
【図１】 本発明の構成図FIG. 1 is a block diagram of the present invention
【図２】 本発明の実施例の要所詳細図 (A)は平面図 (B)は断面図FIG. 2 is a detailed view of essential parts of an embodiment of the present invention (A) is a plan view (B) is a sectional view
【図３】 本発明の光方向性結合器の波長特性図FIG. 3 is a wavelength characteristic diagram of the optical directional coupler according to the present invention.
【図４】 光通信システムの構成図FIG. 4 is a block diagram of an optical communication system.
【図５】 従来例の構成図FIG. 5 is a block diagram of a conventional example
１ 局側光モジュール ２ 加入者側光モジュール 1-1 局側光電変換素子 1-2 局側第１の電光変換素子 1-3 局側第２の電光変換素子 2-1 電光変換素子 2-2 第１の光電変換素子 2-3 第２の光電変換素子 ５ 光ファイバ 11 光カプラ 12 光合分波器 20 光回路基板 21 光カプラ 22 光合分波器 25-0 基幹光導波路 25-1 第１の光導波路 25-2 第２の光導波路 25-3 第３の光導波路 25-4 第４の光導波路 30 光フィルタ30 40 光方向性結合器形カプラ 1 Station side optical module 2 Subscriber side optical module 1-1 Station side photoelectric conversion element 1-2 Station side first electro-optical conversion element 1-3 Station side second electro-optical conversion element 2-1 Electro-optical conversion element 2-2 First photoelectric conversion element 2-3 Second photoelectric conversion element 5 Optical fiber 11 Optical coupler 12 Optical multiplexer / demultiplexer 20 Optical circuit board 21 Optical coupler 22 Optical multiplexer / demultiplexer 25-0 Core optical waveguide 25-1 First Optical waveguide 25-2 Second optical waveguide 25-3 Third optical waveguide 25-4 Fourth optical waveguide 30 Optical filter 30 40 Optical directional coupler coupler
Claims (1)
子(2-1) 、短波長帯（λ1)を受光する第１の光電変換素
子(2-2) 及び長波長帯（λ2)を受光する第２の光電変換
素子(2-3) とを有する加入者と、局との間に、光ファイ
バ(5) を配線し該光ファイバ(5) を介して、短波長帯
（λ1)と長波長帯（λ2)とを送受する光通信システムに
おいて、 該光ファイバ(5) に光結合する基幹光導波路(25-0)と、 該基幹光導波路(25-0)が分岐してなる、一方の第３の光
導波路(25-3)及び該光電変換素子(2-3) に結合する他方
の第４の光導波路(25-4)と、 該第３の光導波路(25-3)が分岐してなる、該電光変換素
子(2-1) に結合する一方の第１の光導波路(25-1)、及び
該第１の光電変換素子(2-2) に結合する他方の第２の光
導波路(25-2)と、 前者の３つの光導波路(25-0,25-3,25-4)が構成する三叉
路部に形成され、該光ファイバ(5) からの伝送される光
の短波長帯（λ1)を該第３の光導波路(25-3)に、該光の
長波長帯（λ2)を該第４の光導波路(25-4)に分波伝送す
る光合分波器(22)と、 後者の３つの該光導波路(25-3,25-2,25-1)が構成する三
叉路部に形成され、該第２の光導波路(25-2)に対して長
波長帯（λ2)で結合損失が大きい光方向性結合器形カプ
ラ(40)とが、 光回路基板(20)にモノリシックに形成されてなることを
特徴とする光導波路デバイス。1. A short wavelength band (lambda 1) electro-optic conversion element that transmits (2-1), a first photoelectric conversion element for receiving the short wavelength band (lambda 1) (2-2) and long wavelength ( λ 2 ) A subscriber having a second photoelectric conversion element (2-3) for receiving λ 2 ) and an optical fiber (5) between the station and the short wavelength through the optical fiber (5). In an optical communication system for transmitting and receiving a band (λ 1 ) and a long wavelength band (λ 2 ), a backbone optical waveguide (25-0) optically coupled to the optical fiber (5) and a backbone optical waveguide (25-0 ) Is branched, and the other fourth optical waveguide (25-4) coupled to the one third optical waveguide (25-3) and the photoelectric conversion element (2-3), and the third optical waveguide (25-3), The first optical waveguide (25-1), which is formed by branching the optical waveguide (25-3) and is coupled to the electro-optical conversion element (2-1), and the first photoelectric conversion element (2-2 ) To the other second optical waveguide (25-2) and the former three optical waveguides (25-0,25-3,25-4) Is formed, said short-wavelength band of the light transmitted from the optical fiber (5) to (lambda 1) to the third optical waveguide (25-3), the light of long wavelength bands (lambda 2) Optical multiplexer / demultiplexer (22) for demultiplexing and transmission to the optical waveguide (25-4) of No. 4 and the latter three optical waveguides (25-3, 25-2, 25-1) The optical directional coupler coupler (40) having a large coupling loss in the long wavelength band (λ 2 ) with respect to the second optical waveguide (25-2) is monolithically provided on the optical circuit board (20). An optical waveguide device characterized by being formed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8740192A JPH05289120A (en) | 1992-04-09 | 1992-04-09 | Optical waveguide device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8740192A JPH05289120A (en) | 1992-04-09 | 1992-04-09 | Optical waveguide device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH05289120A true JPH05289120A (en) | 1993-11-05 |
Family
ID=13913857
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8740192A Pending JPH05289120A (en) | 1992-04-09 | 1992-04-09 | Optical waveguide device |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH05289120A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6718098B2 (en) | 2001-07-03 | 2004-04-06 | Nec Corporation | Two-way optical communication module and method for manufacturing the same |
| US6731881B2 (en) | 1999-12-01 | 2004-05-04 | Nec Corporation | Device for transmitting and receiving optical signals |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63287125A (en) * | 1987-05-20 | 1988-11-24 | Hitachi Ltd | Wavelength multiplex bidirectional transmission method |
| JPH02151140A (en) * | 1988-12-02 | 1990-06-11 | Fujitsu Ltd | Same wavelength/two-way data transmission system using optical fiber |
-
1992
- 1992-04-09 JP JP8740192A patent/JPH05289120A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63287125A (en) * | 1987-05-20 | 1988-11-24 | Hitachi Ltd | Wavelength multiplex bidirectional transmission method |
| JPH02151140A (en) * | 1988-12-02 | 1990-06-11 | Fujitsu Ltd | Same wavelength/two-way data transmission system using optical fiber |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6731881B2 (en) | 1999-12-01 | 2004-05-04 | Nec Corporation | Device for transmitting and receiving optical signals |
| US6718098B2 (en) | 2001-07-03 | 2004-04-06 | Nec Corporation | Two-way optical communication module and method for manufacturing the same |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR100389837B1 (en) | Packaging device for waveguide element | |
| US6744945B2 (en) | Wavelength multiplexer and optical unit | |
| US6870991B2 (en) | Fiber-type optical coupler with slanting Bragg diffraction gratings and optical parts and apparatuses using the same | |
| JP3092499B2 (en) | Waveguide type optical multiplexing / demultiplexing module | |
| KR101639602B1 (en) | Optical coupling/splitting device, two-way optical propagation device, and optical transmit-receive system | |
| US10892845B2 (en) | Method and system for a free space CWDM MUX/DEMUX for integration with a grating coupler based silicon photonics platform | |
| CA2225135A1 (en) | Optoelectronic circuit | |
| US20190052362A1 (en) | Method And System For A Free Space CWDM MUX/DEMUX For Integration With A Grating Coupler Based Silicon Photonics Platform | |
| US7142740B2 (en) | Planar lightwave circuit type optical transceiver module | |
| JP3490745B2 (en) | Composite optical waveguide type optical device | |
| JPH08304664A (en) | Wavelength demultiplexing element | |
| US6438291B1 (en) | Coupling of light into a monolithic waveguide device | |
| JPH11352341A (en) | Waveguide type wavelength multiplex light transmission and reception module | |
| JPH10293219A (en) | Structure of optical waveguide coupler | |
| US20030185501A1 (en) | Dual wavelength division multiplexing/demultiplexing device using one planar lightguide circuit | |
| JPH05289120A (en) | Optical waveguide device | |
| JPH10282350A (en) | Optical splitter | |
| CN110941048B (en) | High extinction ratio coarse wavelength division multiplexer/demultiplexer based on multi-mode interference principle | |
| JPH05203830A (en) | Optical multiplexer demultiplexer | |
| US5276746A (en) | Polarization independent optical tap | |
| JP6379258B1 (en) | Optical two-way communication module | |
| JP2865789B2 (en) | Optical transmission module | |
| JP3120777B2 (en) | Optical waveguide type signal light monitor device | |
| KR101501140B1 (en) | Planar Lightwave Circuit Module Having an Improved Structure of an Optical Power Monitor | |
| KR100416983B1 (en) | Alignment element for planar lightguide circuit module |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
Free format text: JAPANESE INTERMEDIATE CODE: A02 Effective date: 19980203 |