JPH01129213A - Optical tuner - Google Patents

Optical tuner

Info

Publication number
JPH01129213A
JPH01129213A JP28783387A JP28783387A JPH01129213A JP H01129213 A JPH01129213 A JP H01129213A JP 28783387 A JP28783387 A JP 28783387A JP 28783387 A JP28783387 A JP 28783387A JP H01129213 A JPH01129213 A JP H01129213A
Authority
JP
Japan
Prior art keywords
optical
optical fiber
diffraction grating
receiving element
light
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
Application number
JP28783387A
Other languages
Japanese (ja)
Inventor
Kiyokazu Hagiwara
萩原 清和
Hiroyuki Asakura
宏之 朝倉
Masanori Iida
正憲 飯田
Minoru Nishioka
稔 西岡
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Panasonic Holdings Corp
Original Assignee
Matsushita Electric Industrial Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Matsushita Electric Industrial Co Ltd filed Critical Matsushita Electric Industrial Co Ltd
Priority to JP28783387A priority Critical patent/JPH01129213A/en
Publication of JPH01129213A publication Critical patent/JPH01129213A/en
Pending legal-status Critical Current

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Abstract

PURPOSE:To constitute an optical tuner having a simple structure by providing a piece of input optical fiber, a piece of rectangular photodetecting element and a rotating mechanism to a plane linear diffraction grating. CONSTITUTION:A piece of the input optical fiber 3, a lens 2 disposed in the front face of the rectangular photodetecting element 4, and the diffraction grating 1 disposed diagonally with the optical axis of the input optical fiber 3 and the rectangular photodetecting element 4 in the front face of the lens 2 are provided and the rotating mechanism 5 is provided to the diffraction grating 1. The optical tuner having the simple structure which is capable of receiving only the light of a required wavelength from plural wavelengths with a piece of the rectangular photodetecting element 4 is thus constituted by providing the rotating mechanism 5 to the plane linear diffraction grating 1.

Description

【発明の詳細な説明】 産業上の利用分野 本発明は、光フアイバ通信において、光波長多重伝送の
受信側に用いる光チューナに関するものである。
DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention relates to an optical tuner used on the receiving side of optical wavelength division multiplexing transmission in optical fiber communications.

従来の技術 近年、光波長多重伝送技術は、光フアイバ伝送において
、−本の光ファイバを有効に活用して、複数の信号を異
なった波長にのせて送り、信号の伝送容量の増大を図る
手段として注目され、利用されている。
Conventional technology In recent years, optical wavelength division multiplexing transmission technology has become a means of increasing signal transmission capacity by effectively utilizing two optical fibers and transmitting multiple signals on different wavelengths in optical fiber transmission. It is attracting attention and being used as such.

従来、上述の光波長多重伝送においては、受信側では、
光を波長分割するものとして光分波器が用いられていた
Conventionally, in the above-mentioned optical wavelength division multiplexing transmission, on the receiving side,
Optical demultiplexers were used to split light into wavelengths.

以下、図面を参照しながら、この光分波器の一例につい
て説明する。
An example of this optical demultiplexer will be described below with reference to the drawings.

第3図は従来の光分波器を示すものである。第3図にお
いて、31は平面直線回折格子、32はレンズ、33は
入力光ファイバ、34.35゜36.37.38は出力
光ファイバ、39.40゜41.42.43は光−電気
変換器を示し、前記レンズ32は前記平面直線回折格子
31と、前記入力光ファイバ33および前記出力光ファ
イバ34,35.36,37.38の間に配置されてい
る。
FIG. 3 shows a conventional optical demultiplexer. In Fig. 3, 31 is a planar linear diffraction grating, 32 is a lens, 33 is an input optical fiber, 34.35° 36.37.38 is an output optical fiber, and 39.40° 41.42.43 is an optical-to-electrical converter. The lens 32 is arranged between the planar linear diffraction grating 31, the input optical fiber 33 and the output optical fibers 34, 35, 36, 37, 38.

以上のように構成された光分波器について以下その動作
について説明する。
The operation of the optical demultiplexer configured as described above will be explained below.

前記入力光ファイバ33から、5つの異なる波長からな
る光を、前記レンズ32を介して平面直線回折格子に入
射することによって、前記光は波長分散を受け、波長ご
とに異なる角度で反射されるとともに前記レンズで収束
され、各々波長の異なる光は出力光ファイバ34.35
,36,37゜38で受光され光−電気変換器39,4
0.41゜42.43でそれぞれ電気信号に変換される
By inputting light having five different wavelengths from the input optical fiber 33 to the plane linear diffraction grating through the lens 32, the light undergoes wavelength dispersion and is reflected at different angles for each wavelength. The lights converged by the lens and having different wavelengths are output to optical fibers 34 and 35.
, 36, 37° 38 and the photoelectric converter 39, 4
They are converted into electrical signals at angles of 0.41° and 42.43°, respectively.

(例えば、r1978年度電子通信学会技術研究報告・
C378−166,37ページ〜42ページ」) 発明が解決しようとする問題点 しかしながら上記のような構成では、−度に複数の広帯
域の信号を受信するのには適しているが、何チャンネル
ものテレビ信号を一本の光ファイバで伝送する放送型の
光波長多重伝送のように、−度には一つの信号すなわち
一つの波長しか必要としない場合には、光ファイバおよ
び光−電気変換器は一組あればよ(、光−電気変換器の
コストが高いことから、新しい機能の部品がのぞまれて
いた。
(For example, r1978 Institute of Electronics and Communication Engineers Technical Research Report
C378-166, pages 37 to 42) Problems to be Solved by the Invention However, although the above configuration is suitable for receiving multiple broadband signals at once, it is not suitable for receiving multiple channels of television. When only one signal, or one wavelength, is required at a time, such as broadcast-type optical wavelength division multiplexing, in which the signal is transmitted over a single optical fiber, the optical fiber and optical-to-electrical converter are Because the cost of optical-to-electrical converters is high, parts with new functions were needed.

本発明は上記問題点を考慮し、放送型の光波長多重伝送
に最も適した光受信側の装置となる光チューナを提供す
るものである。
The present invention takes the above-mentioned problems into consideration and provides an optical tuner that is an optical receiving side device most suitable for broadcast-type optical wavelength division multiplexing transmission.

問題点を解決するための手段 上記問題点を解決するために本発明の光チューナは、−
本の入力光ファイバと、一個の矩形の受光素子と、前記
入力光ファイバと前記矩形の受光素子の前方空間に配置
されたレンズと、前記レンズの前方空間に、前記入力光
ファイバおよび前記矩形の受光素子の光軸に対して斜に
配置された回折格子を有し、前記回折格子は回転機構を
備えたものである。
Means for Solving the Problems In order to solve the above problems, the optical tuner of the present invention has the following features:
an input optical fiber, a rectangular light-receiving element, a lens disposed in a space in front of the input optical fiber and the rectangular light-receiving element, and a lens disposed in a space in front of the lens; It has a diffraction grating arranged obliquely with respect to the optical axis of the light receiving element, and the diffraction grating is equipped with a rotation mechanism.

作用 本発明は上記した構成によって、平面直線回折格子に回
転機構を持たせることによって、複数の波長の中から必
要とする波長の光だけを、一個の矩形の受光素子で受光
することのできる、簡単な構造を持った光チューナを作
成することができる。
According to the present invention, with the above-described configuration, by providing a rotation mechanism to the planar linear diffraction grating, only the light of the required wavelength out of a plurality of wavelengths can be received by a single rectangular light receiving element. An optical tuner with a simple structure can be created.

実施例 以下本発明の一実施例の光チューナについて図面を参照
しながら説明する。
EXAMPLE Hereinafter, an optical tuner according to an example of the present invention will be described with reference to the drawings.

第1図は本発明における光チューナを示すものである。FIG. 1 shows an optical tuner according to the present invention.

第1図において1は平面直線回折格子を示す。2はレン
ズを示す。
In FIG. 1, numeral 1 indicates a planar linear diffraction grating. 2 indicates a lens.

前述の構成において、前記入力光ファイバ3から5つの
異なる信号を、5つの異なる波長からなる光にのせて、
前に己レンズ2を介して平面直線回折格子lに斜に入射
することによって、前記5つの異なる波長からなる光は
波長分散を受けて波長ごとに異なる角度で反射されると
ともに、レンズ2で集光され、各々波長の異なる光の中
の一つの波長Nの光だけが一個の矩形の受光素子4の素
子面上で焦点を結び、他の波長の光は矩形の受光素子に
は入射されない。
In the above-mentioned configuration, five different signals from the input optical fiber 3 are put on light consisting of five different wavelengths,
By first obliquely entering the planar linear diffraction grating l through the self-lens 2, the light consisting of the five different wavelengths undergoes wavelength dispersion and is reflected at different angles for each wavelength, and is condensed by the lens 2. Among the lights of different wavelengths, only one light of wavelength N is focused on the element surface of one rectangular light-receiving element 4, and light of other wavelengths is not incident on the rectangular light-receiving element.

従って、他の波長の光を受光する時は、回転機構5を用
いて前記平面直線回折格子を回転させ、所用の波長の光
を矩形の受光素子出力光ファイバに入射し、電気信号に
変換すればよい。
Therefore, when receiving light of another wavelength, the rotation mechanism 5 is used to rotate the planar linear diffraction grating, and the light of the desired wavelength is incident on the rectangular photodetector output optical fiber and converted into an electrical signal. Bye.

第2図は受光素子の形状と波長特性の関係を示す図で、
第2図(al、 (C1は受光素子の形状と結像光との
関係を示し、第2図(bl、 (d+は波長と人力光量
との関係を示す波長特性を示す図である。
Figure 2 is a diagram showing the relationship between the shape of the light receiving element and the wavelength characteristics.
Figure 2 (al, (C1) shows the relationship between the shape of the light receiving element and the imaging light, and Figure 2 (bl, (d+) shows the wavelength characteristic that shows the relationship between the wavelength and the amount of human light.

第2図(alで21は円形の受光素子を示し、22は結
像光を示し波長が変わると結像光が22” と異動し、
中心波長では円形の受光素子21に重なる。この場合の
波長特性は、第2図(b)に示すように通過域の波長と
して入力光量との関係を示す波長特性は単峰特性になる
In Figure 2 (al), 21 indicates a circular light-receiving element, 22 indicates imaging light, and as the wavelength changes, the imaging light changes to 22''.
At the center wavelength, it overlaps with the circular light receiving element 21. In this case, as shown in FIG. 2(b), the wavelength characteristic showing the relationship with the amount of input light as the wavelength of the passband becomes a single peak characteristic.

これに対して、第2図fc)に示す本願では、矩形の受
光素子23と結像光22および22゛ との関係は円形
の受光素子の時に比べて、通過域の特性がフラットな第
2図(d)のような良好な波長特性を示す。
On the other hand, in the present application shown in FIG. It exhibits good wavelength characteristics as shown in Figure (d).

以上のように本実施例によれば平面直線回折格子に、回
転機構を付けることによって、従来の光分波器に波長選
択効果を持たせることができ、また、矩形の受光素子で
良好な波長特性で直接電気信号に変換することができ、
小型で高性能な光波長多重伝送の新しい機能の部品を堤
供するものである。
As described above, according to this embodiment, by attaching a rotation mechanism to a plane linear diffraction grating, a conventional optical demultiplexer can have a wavelength selection effect, and a rectangular photodetector can select a good wavelength. The characteristics can be directly converted into electrical signals,
The project provides components with new functions for compact, high-performance optical wavelength division multiplexing transmission.

なお、本実施例では受光素子の一辺の寸法が光ファイバ
のコア径と同じ時を示したが、−辺の寸法が光ファイバ
のコア径よりも大きくなった方が位置ぎめ等の点で有利
である。
Although this example shows the case where the dimension of one side of the light receiving element is the same as the core diameter of the optical fiber, it is advantageous in terms of positioning etc. if the dimension of the - side is larger than the core diameter of the optical fiber. It is.

発明の効果 以上のように本発明は、−本の入力光ファイバと、一個
の矩形の受光素子と、平面直線回折格子に回転機構を設
けることによって、非常に単純な形状を有する光学部材
で光チューナを構成することができ、また、矩形の受光
素子で良好な波長特性で直接電気信号に変換することが
でき、放送型光波長多重伝送に適した新しい光部品を作
成することができる。
Effects of the Invention As described above, the present invention provides a rotation mechanism for input optical fibers, one rectangular light-receiving element, and a flat linear diffraction grating. A tuner can be constructed, and a rectangular light-receiving element can be used to directly convert into an electrical signal with good wavelength characteristics, making it possible to create a new optical component suitable for broadcast-type optical wavelength division multiplexing transmission.

【図面の簡単な説明】[Brief explanation of the drawing]

第1図は本発明の一実施例における光チューナの斜視図
、第2図fa)〜fd)は受光素子の形状を示す説明図
と波長特性を示すグラフ、第3図は従来の光分波器の斜
視図である。 1・・・・・・平面直線回折格子、2・・・・・・レン
ズ、3・・・・・・人力光ファイバ、4・・・・・・矩
形の受光素子、5・・・・・・回転機構、21・・・・
・・円形の受光素子、22・・・・・・結像光、23・
・・・・・矩形の受光素子。 代理人の氏名 弁理士 中尾敏男 はか1名/ −一一
子面回jfT称子 ?−−−ンシヌパ 3−一一人力光ファイバ゛ 4−m−矩形及光素子 、ff −−−D軟濾購 /2 ((1)       (b) (C2(d) 課長
Fig. 1 is a perspective view of an optical tuner according to an embodiment of the present invention, Fig. 2 fa) to fd) are explanatory diagrams showing the shape of the light receiving element and graphs showing wavelength characteristics, and Fig. 3 is a conventional optical demultiplexer. It is a perspective view of a container. 1... Planar linear diffraction grating, 2... Lens, 3... Human powered optical fiber, 4... Rectangular light receiving element, 5...・Rotation mechanism, 21...
...Circular light-receiving element, 22...Imaging light, 23.
...Rectangular light-receiving element. Name of agent: Patent attorney Toshio Nakao, 1 person/-Ichiko MenkijfT Seiko? ---Insinupa 3-Individual power optical fiber゛4-m-Rectangular optical element, ff ---D soft filter purchase/2 ((1) (b) (C2 (d) Manager

Claims (3)

【特許請求の範囲】[Claims] (1)一本の入力光ファイバと、一個の矩形の受光素子
と、前記入力光ファイバと前記矩形の受光素子の前方空
間に配置されたレンズと、前記レンズの前方空間に、前
記入力光ファイバおよび前記矩形の受光素子の光軸に対
して斜に配置された回折格子とを有し、前記回折格子は
回転機構を具備して成ることを特徴とする光チューナ。
(1) One input optical fiber, one rectangular light-receiving element, a lens disposed in a space in front of the input optical fiber and the rectangular light-receiving element, and one input optical fiber in the space in front of the lens. and a diffraction grating arranged obliquely with respect to the optical axis of the rectangular light-receiving element, the diffraction grating comprising a rotation mechanism.
(2)矩形の受光素子の一辺の寸法が、光ファイバのコ
ア径と同じか、それよりも大であることを特徴とする特
許請求の範囲第(1)項記載の光チューナ。
(2) The optical tuner according to claim (1), wherein the dimension of one side of the rectangular light receiving element is equal to or larger than the core diameter of the optical fiber.
(3)矩形の受光素子の受光面には、反射防止膜が付設
されていることを特徴とする特許請求の範囲第(1)項
記載の光チューナ。
(3) The optical tuner according to claim (1), wherein an antireflection film is attached to the light receiving surface of the rectangular light receiving element.
JP28783387A 1987-11-13 1987-11-13 Optical tuner Pending JPH01129213A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP28783387A JPH01129213A (en) 1987-11-13 1987-11-13 Optical tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP28783387A JPH01129213A (en) 1987-11-13 1987-11-13 Optical tuner

Publications (1)

Publication Number Publication Date
JPH01129213A true JPH01129213A (en) 1989-05-22

Family

ID=17722353

Family Applications (1)

Application Number Title Priority Date Filing Date
JP28783387A Pending JPH01129213A (en) 1987-11-13 1987-11-13 Optical tuner

Country Status (1)

Country Link
JP (1) JPH01129213A (en)

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