JP2778236B2 - Waveguide-type optical multiplexer / demultiplexer and optical transmission module using the same - Google Patents
Waveguide-type optical multiplexer / demultiplexer and optical transmission module using the sameInfo
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- JP2778236B2 JP2778236B2 JP2251736A JP25173690A JP2778236B2 JP 2778236 B2 JP2778236 B2 JP 2778236B2 JP 2251736 A JP2251736 A JP 2251736A JP 25173690 A JP25173690 A JP 25173690A JP 2778236 B2 JP2778236 B2 JP 2778236B2
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- demultiplexer
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Description
【発明の詳細な説明】 ［産業上の利用分野］ 本発明は、小型で低損失な導波路型光合分波器及びそ
れを用いた光伝送用モジュールに関するものである。Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a small-sized and low-loss waveguide type optical multiplexer / demultiplexer and an optical transmission module using the same.
［従来の技術］ 光ファイバ通信の発展に伴い、１本の光ファイバを用
い、双方向伝送，異種信号の同時伝送等、経済的で拡張
性に富んだシステムの構築が可能な波長分割多重伝送が
注目されるようになってきた。このシステムでは、波長
の異なる光信号を合波あるいは分波する役目を担う光合
分波器が不可欠である。[Prior Art] With the development of optical fiber communication, wavelength division multiplexing transmission that can construct an economical and scalable system, such as bidirectional transmission and simultaneous transmission of heterogeneous signals, using a single optical fiber. Is getting attention. In this system, an optical multiplexer / demultiplexer that plays a role of multiplexing or demultiplexing optical signals having different wavelengths is indispensable.
従来、光合分波器としては、（１）第５図の如くプリ
ズムａやレンズb,誘電体多層膜フィルタｃ等の個別部品
を組み合わせた個別部品組合せ型光合分波器ｄや、
（２）第６図の如く２本の光ファイバｅを所望の長さだ
け融着結合させて方向性結合器ｆを作り、この方向性結
合器の波長依存性を利用した光合分波器が用いられてい
た。Conventionally, as an optical multiplexer / demultiplexer, (1) an individual component combination type optical multiplexer / demultiplexer d combining individual components such as a prism a, a lens b, and a dielectric multilayer filter c as shown in FIG.
(2) As shown in FIG. 6, two optical fibers e are fusion-bonded by a desired length to form a directional coupler f, and an optical multiplexer / demultiplexer utilizing the wavelength dependence of the directional coupler is provided. Was used.
また最近になって本発明者は、第４図（ａ）及び
（ｂ）に示すようなガラス導波路構造で方向性結合器ｇ
を構成し、その方向性結合器ｇを３個用いることによ
り、波長間のアイソレーションを大きく取れる実用的な
導波路型光合分波器を提案している。Recently, the present inventor has proposed a directional coupler g with a glass waveguide structure as shown in FIGS. 4 (a) and 4 (b).
And use of three directional couplers g to propose a practical waveguide-type optical multiplexer / demultiplexer capable of obtaining large isolation between wavelengths.
［発明が解決しようとする課題］ しかし、従来の個別部品組合せ型光合分波器（第５
図）は、部品間の光軸ずれやフレネル反射による損失，
各部品の吸収及び散乱損失等による損失が大きいという
問題点と、組立及び加工費が高くつくといった問題点が
ある。[Problems to be Solved by the Invention] However, the conventional individual component combination type optical multiplexer / demultiplexer (No. 5)
Figure) shows the loss of optical axis between components and the loss due to Fresnel reflection.
There is a problem that the loss due to absorption and scattering loss of each part is large and a problem that assembly and processing costs are high.
一方、光ファイバを用いた方向性結合器型光合分波器
（第６図）は、分波すべき中心波長を所望値に再現性良
く合わせて作成することが難しいことと、波長間のアイ
ソレーションを大きく取ろうとすると、方向性結合器を
縦続接続して用いる必要があり、サイズが大きくなると
いう問題点がある。On the other hand, a directional coupler type optical multiplexer / demultiplexer using an optical fiber (FIG. 6) has difficulty in making a center wavelength to be demultiplexed to a desired value with good reproducibility, and has a problem of isolating between wavelengths. In order to increase the ratio, it is necessary to use directional couplers connected in cascade, and there is a problem that the size is increased.
一方、第４図の導波路型光合分波器は、光ファイバを
用いた方向性結合器型光合分波器に比べ、小型でアイソ
レーションを大きく取れるという特長があるが、損失は
光ファイバ型に比べて大きいという問題点がある。ま
た、サイズもかなり小さくなっているが、個別部品組合
せ型光合分波器に比べ若干大きいという問題点があっ
た。On the other hand, the waveguide type optical multiplexer / demultiplexer shown in FIG. 4 has a feature that it is smaller and can obtain a larger isolation than a directional coupler type optical multiplexer / demultiplexer using an optical fiber. There is a problem that it is larger than that. Although the size is considerably small, there is a problem that the size is slightly larger than that of the optical multiplexer / demultiplexer combined with individual components.
特に、第４図（ｂ）の導波路型光合分波器の２つの出
力導波路の一側に発光素子を、他側に受光素子を結合さ
せて光伝送用モジュールを構成する場合には、発光素子
（あるいは受光素子）のサイズを考慮して、２つの出力
導波路間隔Ｇを２〜5mmにしなければならない。このよ
うに出力導波路間隔Ｇを大きくした場合に、曲げ部によ
る損失（放射損失）をできる限り低く抑えるためには、
第５図に示すように、初段の第１の方向性結合器51と次
段の第2,第３の方向性結合器52,53の間を、大きな曲げ
半径Ｒ（40〜50mm）の曲線導波路54,55及び56,57でつな
ぎ、全体としてそれぞれＳ曲線の形（Ｓ曲線部60,61）
に構成する。In particular, when a light-emitting element is coupled to one side of the two output waveguides of the waveguide type optical multiplexer / demultiplexer of FIG. 4B and a light-receiving element is coupled to the other side, an optical transmission module is constructed. In consideration of the size of the light emitting element (or light receiving element), the distance G between the two output waveguides must be 2 to 5 mm. In order to keep the loss (radiation loss) due to the bent portion as low as possible when the output waveguide interval G is increased as described above,
As shown in FIG. 5, a curve having a large bending radius R (40 to 50 mm) is provided between the first directional coupler 51 in the first stage and the second and third directional couplers 52 and 53 in the next stage. Connected by waveguides 54, 55 and 56, 57, as a whole in the form of an S curve (S curves 60, 61)
To be configured.
しかし、この曲線導波路54と55又は56と57を接続した
形態では、長いＳ曲線部60,61を光が伝搬するにつれて
光は次第に片方向のみに曲げられ、接続部58,59を過ぎ
ると今度は逆に反対方向に曲げられて伝搬しなければな
らず、この部分で伝搬モード分布のミスマッチによる放
射損失が発生し、結果的に光ファイバ型に比べ、損失が
大きくなるという問題点があった。However, in the form in which the curved waveguides 54 and 55 or 56 and 57 are connected, the light gradually bends only in one direction as the light propagates through the long S-curved portions 60 and 61, and passes through the connection portions 58 and 59. This time, propagation must be made in the opposite direction, and radiation loss due to mismatch of the propagation mode distribution occurs in this part, and as a result, there is a problem that the loss is larger than that of the optical fiber type. Was.
これを解決するためには、できる限り直線に近い導波
路、つまり大きな曲げ半径Ｒで構成すればよいが、逆に
光合分波器の寸法が大きくなり過ぎるという問題点と、
長さが増したことによる吸収損失による損失増加という
問題点がある。In order to solve this, it is sufficient to configure the waveguide as close to a straight line as possible, that is, with a large bending radius R, but on the contrary, the size of the optical multiplexer / demultiplexer becomes too large,
There is a problem that the loss increases due to absorption loss due to the increase in length.
尚、曲線の半径Ｒの値は、導波路のコアとクラッドと
の間の屈折率差Δの値によって決められる。即ち、Δが
大きい場合には導波路内へのと閉じ込めが良くなるため
にＲは小さくでき、逆にΔが小さい場合には導波路内へ
の光の閉じ込めが悪くなるので、Ｒを大きくして放射損
失をできる限り小さく抑えなければならない。例えばΔ
が0.25％の場合にはＲは50mm程度にしなければならず、
Δが0.75％程度でもＲは10mm程度が限界である。Note that the value of the radius R of the curve is determined by the value of the refractive index difference Δ between the core and the clad of the waveguide. That is, when Δ is large, R can be reduced because the confinement in the waveguide is improved, and conversely, when Δ is small, the confinement of light in the waveguide becomes poor. Radiation loss must be kept as low as possible. For example, Δ
Is 0.25%, R must be about 50mm,
Even if Δ is about 0.75%, R is limited to about 10 mm.
このように、出力導波路間隔Ｇの値が大きくなると、
Ｓ曲線部での伝搬モード分布のミスマッチによる放射損
失の増大と、導波路長が長くなることによって吸収損失
による損失増加が問題になってくることが分った。Thus, when the value of the output waveguide interval G increases,
It has been found that an increase in radiation loss due to a mismatch in the propagation mode distribution in the S-curve portion and an increase in loss due to absorption loss due to an increase in the waveguide length become problems.
本発明の目的は、前記した従来の欠点を解消し、小型
で低損失な導波路型光合分波器と、それに発光素子，受
光素子などを実装した光伝送用モジュールを提供するこ
とにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a compact and low-loss waveguide type optical multiplexer / demultiplexer which solves the above-mentioned conventional disadvantages, and an optical transmission module in which a light emitting element, a light receiving element and the like are mounted.
［課題を解決するための手段］ 本発明の導波路型光合分波器は、２つの略矩形状コア
導波路を接近させて第１の方向性結合器を構成し、その
２つの出力導波路を所望角度で折れ線状に外側方向に曲
げることにより出力導波路間隔を拡げた後、該曲り部か
らそれぞれ直線状に延在する直線状導波路部分にそれぞ
れ別のコア導波路を接近させて第2,第３の方向性結合器
を構成したものである。Means for Solving the Problems In a waveguide type optical multiplexer / demultiplexer according to the present invention, a first directional coupler is formed by bringing two substantially rectangular core waveguides close to each other, and the two output waveguides are provided. Is bent outward at a desired angle to extend the output waveguide interval, and then another core waveguide is approached to each of the linear waveguide portions extending linearly from the bent portion. 2, which constitutes a third directional coupler.
上記第1,第２及び第３の方向性結合器の導波路は基板
上に形成された低屈折率層内に埋め込まれていること、
また、上記第1,第２及び第３の方向性結合器の構造パラ
メータは略等しいこと、更には上記第１の方向性結合器
の入力導波路と第2,第３の方向性結合器の出力導波路と
が略平行に配置されていることが好ましい。The waveguides of the first, second and third directional couplers are embedded in a low-refractive-index layer formed on a substrate;
Further, the structural parameters of the first, second and third directional couplers are substantially equal, and furthermore, the input waveguide of the first directional coupler and the second and third directional couplers It is preferable that the output waveguide and the output waveguide are arranged substantially in parallel.
また、本発明の光伝送用モジュールは、上記の導波路
型光合分波器における第2,第３の方向性結合器の出力導
波路の一方に発光素子を、他方に発光素子若しくは受光
素子を接続することで構成できる。In the optical transmission module of the present invention, a light emitting element is provided on one of the output waveguides of the second and third directional couplers in the above-described waveguide type optical multiplexer / demultiplexer, and a light emitting element or a light receiving element is provided on the other. It can be configured by connecting.
［作用］ 本発明の導波路型光合分波器は、初段の方向性結合器
の２つの出力導波路を所望角度で折れ線状に外側方向に
曲げた後に直線状に延ばし、これにより出力導波路間隔
を拡げ、その２つの直線状導波路部分にそれぞれ次段の
方向性結合器を設け、好ましくは更にこの次段の方向性
結合器の出力導波路を再び前記所望角度で曲げて、該初
段の方向性結合器の入力導波路と平行になるようにした
構成とすることにより、小型化を図ったものである。[Operation] In the waveguide type optical multiplexer / demultiplexer of the present invention, the two output waveguides of the first-stage directional coupler are bent in a bent manner at a desired angle in the outward direction, and then linearly extended. The interval is increased, and the two-stage linear waveguide portions are provided with the next-stage directional couplers, respectively. Preferably, the output waveguide of the next-stage directional coupler is bent again at the desired angle, and The structure is designed to be parallel to the input waveguide of the directional coupler, thereby reducing the size.
そして小型化により、導波路伝搬損失の低減化が可能
となり、また初段と次段の方向性結合器との間に曲線部
あるいは複数箇所の不連続部がないので低損失化を期待
できるものである。The miniaturization makes it possible to reduce the propagation loss of the waveguide, and since there is no curved part or multiple discontinuous parts between the first-stage and the next-stage directional coupler, low loss can be expected. is there.
［実施例］ 第１図に本発明の導波路型光合分波器の実施例を示
す。Embodiment FIG. 1 shows an embodiment of a waveguide type optical multiplexer / demultiplexer according to the present invention.
この導波路型光合分波器10は、略同一の構造の３つの
方向性結合器、即ち初段の第１の方向性結合器11と次段
の第2,第３の方向性結合器12,13とを有する。The waveguide type optical multiplexer / demultiplexer 10 has three directional couplers having substantially the same structure, that is, a first directional coupler 11 in a first stage and second and third directional couplers 12 in a next stage. 13 and.
第１の方向性結合器11は２つの略矩形状コア導波路1,
2を接近させて構成してあり、その２つの出力コア導波
路は、所望角度θ/2で折れ線状に外側方向に曲げた後、
該曲り部３から直線的に延在させて出力コア導波路間隔
Ｇを直線的に拡げている。第2,第３の方向性結合器12,1
3は、この２つの直線状導波路部分4,5にそれぞれ別の略
矩形状コア導波路６又は７を接近させて構成してあり、
それらの各２つの出力導波路のうちの一方（4,7）は、
再び上記所望角度θ/2で折れ線状に内側方向に曲げ、該
曲り部8,9から直線的に延ばし、これにより形成される
上記初段の方向性結合器11の入力導波路１と平行な直線
状導波路部分を光合分波器10の出力導波路14,15として
いる。The first directional coupler 11 includes two substantially rectangular core waveguides 1,
The two output core waveguides are bent outward at a desired angle θ / 2 in a polygonal line,
The output core waveguide interval G is linearly extended from the bent portion 3 to extend linearly. Second and third directional couplers 12,1
3 is configured such that another substantially rectangular core waveguide 6 or 7 is approached to the two linear waveguide portions 4 and 5, respectively.
One (4,7) of each of those two output waveguides is
Again, it is bent inward at the desired angle θ / 2 in the form of a polygonal line, linearly extended from the bent portions 8 and 9, and formed by the straight line parallel to the input waveguide 1 of the first-stage directional coupler 11. The waveguide portions are output waveguides 14 and 15 of the optical multiplexer / demultiplexer 10.
上記３つの方向性結合器11,12及び13は略同一構造で
あり、これらの方向性結合器は、波長λ１の光信号はそ
のまま通し、波長λ２の光信号を選択的に分波するよう
に、結合長L,導波路幅W,導波路と導波路の間隔S,クラッ
ドに対するコアの比屈折率差Δの値が最適化されてい
る。The three directional couplers 11, 12, and 13 have substantially the same structure. These directional couplers pass the optical signal of the wavelength λ1 as it is and selectively separate the optical signal of the wavelength λ2. The values of the coupling length L, the waveguide width W, the distance S between the waveguides and the relative refractive index difference Δ of the core with respect to the cladding are optimized.
入力導波路１へ矢印16の如く入射した波長λ1,λ２の
光信号は、初段の方向性結合器11において波長λ１の光
信号は矢印17方向へ、波長λ２の光信号は矢印18方向へ
それぞれ分けられる。矢印17の如く伝搬した波長λ１の
光信号は、方向性結合器12で更に純度よく濾過（フィル
タリング）され、出力導波路14より矢印19の如く取り出
される。他方、矢印18の如く伝搬した波長λ２の光信号
は、方向性結合器13で更に分波されて出力導波路15より
矢印20の如く取り出される。The optical signals of the wavelengths λ1 and λ2 incident on the input waveguide 1 as indicated by the arrow 16 are, in the first stage directional coupler 11, the optical signal of the wavelength λ1 in the direction of the arrow 17 and the optical signal of the wavelength λ2 in the direction of the arrow 18, respectively. Divided. The optical signal of wavelength λ1 propagated as indicated by the arrow 17 is further filtered (filtered) by the directional coupler 12 with higher purity, and extracted from the output waveguide 14 as indicated by the arrow 19. On the other hand, the optical signal of the wavelength λ2 propagated as indicated by the arrow 18 is further demultiplexed by the directional coupler 13 and extracted from the output waveguide 15 as indicated by the arrow 20.
この構成の特徴は、方向性結合器11の２つの出力導波
路を、それぞれθ/2の角度で傾斜させた直線導波路部4,
5とし、大きな曲げ半径Ｒによる長いＳ曲線部60,61（第
３図）より短くしたことである。従って、これら直線導
波路部４及び５に対して、方向性結合器12及び13を設け
ることにより、光合分波器10の全長も短くなり、小型化
を図ることができる。そして、この小型化により、導波
路伝搬損失の低減化が可能となり、また初段の方向性結
合器11と次段の方向性結合器12,13との間に、第４図
（ｂ）に示したようなＳ曲線部や、第４図（ａ）に示し
たような複数箇所の不連続部がないので低損失化を期待
できるものとなる。The feature of this configuration is that the two output waveguides of the directional coupler 11 are linear waveguide sections 4, 4 inclining at an angle of θ / 2.
5, which is shorter than the long S curve portions 60 and 61 (FIG. 3) due to the large bending radius R. Therefore, by providing the directional couplers 12 and 13 for these linear waveguide sections 4 and 5, the total length of the optical multiplexer / demultiplexer 10 is shortened, and the size can be reduced. This miniaturization makes it possible to reduce the propagation loss of the waveguide, and furthermore, as shown in FIG. 4B, between the directional coupler 11 of the first stage and the directional couplers 12 and 13 of the next stage. Since there is no such S-curved portion or a plurality of discontinuous portions as shown in FIG. 4 (a), a reduction in loss can be expected.
ここで、本発明の場合と先に本発明者が提案した第４
図の場合とで、光合分波器の有効長を比較してみると、
次のようによる。Here, the case of the present invention and the fourth proposed by the inventor earlier.
When comparing the effective length of the optical multiplexer / demultiplexer with the case of the figure,
According to the following.
本発明の光合分波器10の有効長P1は、第１図に示すよ
うに、初段の方向性結合器11の入力部の長さＣ、結合部
の長さＬ、直線状導波路部分4,5の長さの和である。但
し、長さは基板入出力方向の長さを意味する。As shown in FIG. 1, the effective length P1 of the optical multiplexer / demultiplexer 10 according to the present invention is the length C of the input part, the length L of the coupling part, and the length of the linear waveguide part 4 of the directional coupler 11 in the first stage. , 5 is the sum of the lengths. However, the length means the length in the substrate input / output direction.
即ち、第１図から有効長P1は、 で表される。That is, the effective length P1 from FIG. It is represented by
第４図の場合の有効長P2は、Ｓ曲線部の基板方向長さ
を2T、次段の方向性結合器12,13の出力部の長さをＣと
すると、第４図から、 で表される。Assuming that the effective length P2 in the case of FIG. 4 is 2T for the length of the S-curve portion in the substrate direction and C is the length of the output portion of the directional couplers 12 and 13 at the next stage, FIG. It is represented by
ここで、例えばＧ＝2.5mm,R＝50mm,W＝11.4μm,S＝2.
0μm,L＝6.7mm,θ＝８゜,C＝1mmとすると、本発明者が
先に提案した第４図の構成では有効長がP2＝31.08mmと
なるのに対し、本発明による第１図の構成ではP1＝25,4
8mmとなり、本発明の構成にすると20％近く長さを短く
することができる。即ち、小型化することができる。ま
た導波路長が短くなった結果として、導波路伝搬損失が
小さくなる。Here, for example, G = 2.5 mm, R = 50 mm, W = 11.4 μm, S = 2.
If 0 μm, L = 6.7 mm, θ = 8 °, and C = 1 mm, the effective length P2 = 31.08 mm in the configuration of FIG. In the configuration shown, P1 = 25,4
This is 8 mm, and the length of the present invention can be reduced by nearly 20%. That is, the size can be reduced. Also, as a result of the shortened waveguide length, the waveguide propagation loss is reduced.
更に、従来の場合には、曲線部54,56と55,57との接続
部58,59の僅かなずれによる損失増加という問題がある
が、本発明の場合には、直線部で構成されているので、
このような問題点はない。Further, in the conventional case, there is a problem that the loss increases due to a slight displacement of the connection portions 58, 59 between the curved portions 54, 56 and 55, 57, but in the case of the present invention, the loss is increased by the linear portions. Because
There is no such problem.
上記第１図の実施例において、直線状導波路部分４及
び５には方向性結合器をそれぞれ２つ以上設けて、波長
分離度を更に良くしても良い。また方向性結合器の構造
パラメータは、少しずつ異なっていても良い。In the embodiment of FIG. 1, two or more directional couplers may be provided in the linear waveguide portions 4 and 5, respectively, to further improve the wavelength separation. Further, the structural parameters of the directional coupler may be slightly different.
また、第１図において導波路を折れ線状に１つの曲線
で曲げる角度θ/2は、0.5゜〜４゜の範囲から選ぶこと
ができる。更に、それら曲り部3,8,9の曲げは、連続的
な曲線で曲げるように構成することもでき、それにより
この曲げ部分での不要な散乱損失を低減することができ
る。In FIG. 1, the angle θ / 2 at which the waveguide is bent in a polygonal line with one curve can be selected from the range of 0.5 ° to 4 °. Further, the bent portions 3, 8, and 9 may be configured to be bent in a continuous curve, so that unnecessary scattering loss at the bent portion can be reduced.
第２図に上記導波路型光合分波器10を用いた双方向性
伝送用光モジュールの実施例を示す。FIG. 2 shows an embodiment of an optical module for bidirectional transmission using the waveguide type optical multiplexer / demultiplexer 10.
これは、出力導波路14の端面に、レンズ（少なくとも
１個の球，あるいは集束性のロッドレンズ、例えば球レ
ンズと集束性ロッドレンズの組み合わせ）付きの発光素
子（半導体レーザ，発光ダイオード等）22を設け、矢印
24の如く波長λ１の光信号を送出させ、方向性結合器12
及び11を通って光ファイバ21内を矢印26の如く伝搬させ
る。他方、光ファイバ21内を矢印27の如く伝搬してきた
波長λ２の光信号は、方向性結合器11及び13でそれぞれ
分波されて、出力導波路15から矢印25の如くレンズ付き
受光素子23内へ入射する構成の光モジュールである。This is because a light emitting element (semiconductor laser, light emitting diode, etc.) 22 having a lens (at least one sphere or a converging rod lens, for example, a combination of a sphere lens and a converging rod lens) is provided on the end face of the output waveguide 14. The arrow
24, an optical signal of wavelength λ1 is transmitted, and the directional coupler 12
And 11 through the optical fiber 21 as indicated by the arrow 26. On the other hand, the optical signal of the wavelength λ2 that has propagated in the optical fiber 21 as shown by the arrow 27 is demultiplexed by the directional couplers 11 and 13, respectively, and is output from the output waveguide 15 into the lensed light receiving element 23 as shown by the arrow 25. This is an optical module configured to be incident on the optical module.
尚、レンズ付き発光素子22の代わりにレンズ付き受光
素子を用い、光ファイバ21内を伝搬してきたλ１及びλ
２の信号を導波路型光合分波器10でそれぞれ分波させ、
それぞれの受光素子で受信させるいわゆる光受信モジュ
ールであっても良い。またレンズ付き受光素子23の代わ
りに、波長λ２の光信号を送出するレンズ付き半導体レ
ーザを用いた光送信モジュールであっても良い。Note that a light receiving element with a lens is used in place of the light emitting element with a lens 22, and λ1 and λ
2 is demultiplexed by the waveguide type optical multiplexer / demultiplexer 10, respectively.
A so-called light receiving module for receiving light by each light receiving element may be used. Further, instead of the light receiving element 23 with a lens, an optical transmission module using a semiconductor laser with a lens for transmitting an optical signal of wavelength λ2 may be used.
［発明の効果］ 以上述べたように、本発明の導波路型光合分波器は、
次のような効果がある。[Effects of the Invention] As described above, the waveguide type optical multiplexer / demultiplexer of the present invention is
The following effects are obtained.
（１）第１の方向性結合器の２つの出力導波路を所望角
度で曲げて間隔を拡げた本発明によれば、先に本発明者
が提案した導波路型光合分波器に比べ、その有効長を約
40％短くすることができ、小型になる。その結果とし
て、導波路伝搬損失による損失分を小さくすることがで
きる。また、曲線部を２つの組み合わせたＳ曲線を用い
ないで、直線部で構成しているので、光損失を小さくす
ることができる。(1) According to the present invention in which the two output waveguides of the first directional coupler are bent at a desired angle to widen the interval, compared with the waveguide type optical multiplexer / demultiplexer previously proposed by the present inventor, About its effective length
Can be 40% shorter and smaller. As a result, the loss due to the waveguide propagation loss can be reduced. Further, since the curved portion is constituted by a straight portion without using an S curve obtained by combining two curved portions, light loss can be reduced.
第１図は本発明の実施例に係る導波路型光合分波器の構
成図、第２図はその導波路型光合分波器を用いて構成し
た双方向伝送用光モジュールの概略図、第３図は本発明
者が先に提案した導波路型光合分波器の構成図、第４図
は本発明者が先に提案した導波路型光合分波器の概略
図、第５図及び第６図は従来の光合分波器の概略図であ
る。 図中、１は入力導波路、３は曲り部、4,5は直線状導波
路部分、8,9は曲り部、10は導波路型光合分波器、11は
第１の方向性結合器、12は第２の方向性結合器、13は第
３の方向性結合器、14,15は出力導波路、21は光ファイ
バ、22はレンズ付き発光素子、23はレンズ付き受光素子
を示す。FIG. 1 is a configuration diagram of a waveguide type optical multiplexer / demultiplexer according to an embodiment of the present invention. FIG. 2 is a schematic diagram of a bidirectional transmission optical module configured using the waveguide type optical multiplexer / demultiplexer. 3 is a block diagram of the waveguide type optical multiplexer / demultiplexer previously proposed by the present inventors, FIG. 4 is a schematic diagram of the waveguide type optical multiplexer / demultiplexer previously proposed by the present inventors, FIGS. FIG. 6 is a schematic diagram of a conventional optical multiplexer / demultiplexer. In the figure, 1 is an input waveguide, 3 is a bent portion, 4 and 5 are linear waveguide portions, 8 and 9 are bent portions, 10 is a waveguide type optical multiplexer / demultiplexer, and 11 is a first directional coupler. , 12 is a second directional coupler, 13 is a third directional coupler, 14 and 15 are output waveguides, 21 is an optical fiber, 22 is a light emitting element with a lens, and 23 is a light receiving element with a lens.
Claims (5)
１の方向性結合器を構成し、その２つの出力導波路を所
望角度で折れ線状に外側方向に曲げることにより出力導
波路間隔を拡げた後、該曲り部からそれぞれ直線状に延
在する直線状導波路部分にそれぞれ別のコア導波路を接
近させて第2,第３の方向性結合器を構成したことを特徴
とする導波路型光合分波器。A first directional coupler is formed by bringing two substantially rectangular core waveguides close to each other, and the two output waveguides are bent outward at a desired angle in a polygonal manner. After extending the interval, the second and third directional couplers are configured by bringing different core waveguides closer to the linear waveguide portions respectively extending linearly from the bent portion. Waveguide type optical multiplexer / demultiplexer.
波路は基板上に形成された低屈折率層内に埋め込まれて
いることを特徴する請求項１記載の導波路型光合分波
器。2. The waveguide according to claim 1, wherein the waveguides of the first, second and third directional couplers are embedded in a low refractive index layer formed on a substrate. Type optical multiplexer / demultiplexer.
造パラメータは略等しいことを特徴とする請求項１又は
２記載の導波路型光合分波器。3. A waveguide type optical multiplexer / demultiplexer according to claim 1, wherein said first, second and third directional couplers have substantially the same structural parameters.
2,第３の方向性結合器の出力導波路とが略平行に配置さ
れていることを特徴とする請求項1,2又は３記載の導波
路型光合分波器。4. An input waveguide of the first directional coupler and a second directional coupler.
4. The waveguide type optical multiplexer / demultiplexer according to claim 1, wherein the output waveguide of the third directional coupler is arranged substantially in parallel with the output waveguide.
器における上記第2,第３の方向性結合器の出力導波路の
一方に発光素子を、他方に発光素子若しくは受光素子を
接続したことを特徴とする光伝送用モジュール。5. A light emitting device in one of the output waveguides of the second and third directional couplers in the waveguide type optical multiplexer / demultiplexer according to claim 1, 2 or 3, and a light emitting device or a light receiving device in the other. An optical transmission module characterized by connecting elements.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2251736A JP2778236B2 (en) | 1990-09-25 | 1990-09-25 | Waveguide-type optical multiplexer / demultiplexer and optical transmission module using the same |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2251736A JP2778236B2 (en) | 1990-09-25 | 1990-09-25 | Waveguide-type optical multiplexer / demultiplexer and optical transmission module using the same |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04131808A JPH04131808A (en) | 1992-05-06 |
| JP2778236B2 true JP2778236B2 (en) | 1998-07-23 |
Family
ID=17227179
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2251736A Expired - Lifetime JP2778236B2 (en) | 1990-09-25 | 1990-09-25 | Waveguide-type optical multiplexer / demultiplexer and optical transmission module using the same |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2778236B2 (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2012016087A2 (en) | 2010-07-29 | 2012-02-02 | Skyworks Solutions, Inc. | Reducing coupling coefficient variation in couplers |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0731331B2 (en) * | 1984-12-28 | 1995-04-10 | 日本電気株式会社 | Optical hybrid integrated circuit |
| JP2557455B2 (en) * | 1988-03-11 | 1996-11-27 | 日本電信電話株式会社 | Optical multiplexer / demultiplexer |
| JP2580741B2 (en) * | 1988-10-24 | 1997-02-12 | 日立電線株式会社 | Waveguide type optical module |
-
1990
- 1990-09-25 JP JP2251736A patent/JP2778236B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH04131808A (en) | 1992-05-06 |
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