JPS6388821U

JPS6388821U -

Info

Publication number: JPS6388821U
Application number: JP12553386U
Authority: JP
Priority date: 1986-08-19
Filing date: 1986-08-19
Publication date: 1988-06-09

Description

[Brief explanation of drawings]

第１図は本考案の２段構成光アイソレータの一
実施例を示す断面図、第２図は本考案による２段
構成光アイソレータの動作の詳細を示した説明図
、第３図は本考案による２段構成光アイソレータ
の特性（アイソレーシヨンの温度特性）と従来の
１段構成光アイソレータの特性とを比較したグラ
フ、第４図は従来の１段構成光アイソレータの構
造を示す断面図、第５図は従来の他の２段構成光
アイソレータの構造を示す斜視図である。１……複屈折偏光板、２……複屈折偏光板、３
……複屈折偏光板、４……複屈折偏光板、５……
４５度フアラデー回転子、６……４５度フアラデ
ー回転子、７……磁石、８……複屈折偏光板の光
軸、９……複屈折偏光板、１０……複屈折偏光板
、１１……複屈折偏光板、１２……複屈折偏光板
、１３……４５度フアラデー回転子、１４……４
５度フアラデー回転子、１５……入射光、１６…
…出射光、１７……逆方向に進む光、１８……複
屈折偏光板の光軸、１９……磁界の方向、２０，
２０′……常光線、２１，２１′……異常光線、
２２……従来の１段構成の光アイソレータの特性
、２３……本考案による２段構成光アイソレータ
の特性、２４……複屈折偏光板、２５……複屈折
偏光板、２６……４５度フアラデー回転子、２７
……磁石、２８……複屈折偏光板の光軸、２９…
…楔形複屈折偏光板、３０……楔形複屈折偏光板
、３１……楔形複屈折偏光板、３２……楔形複屈
折偏光板、３３……４５度フアラデー回転子、３
４……４５度フアラデー回転子、３５……順方向
に進む光、３６……逆方向に進む光、３７……磁
界の方向。 FIG. 1 is a sectional view showing an embodiment of the two-stage optical isolator of the present invention, FIG. 2 is an explanatory diagram showing details of the operation of the two-stage optical isolator of the present invention, and FIG. 3 is a cross-sectional view of the two-stage optical isolator of the present invention. Figure 4 is a graph comparing the characteristics of a two-stage optical isolator (temperature characteristics of isolation) with the characteristics of a conventional single-stage optical isolator. FIG. 5 is a perspective view showing the structure of another conventional two-stage optical isolator. 1... Birefringent polarizing plate, 2... Birefringent polarizing plate, 3
...Birefringent polarizing plate, 4... Birefringent polarizing plate, 5...
45 degree Faraday rotator, 6... 45 degree Faraday rotator, 7... Magnet, 8... Optical axis of birefringent polarizing plate, 9... Birefringent polarizing plate, 10... Birefringent polarizing plate, 11... Birefringent polarizing plate, 12...Birefringent polarizing plate, 13...45 degree Faraday rotator, 14...4
5 degree Faraday rotator, 15...Incoming light, 16...
... Outgoing light, 17... Light traveling in the opposite direction, 18... Optical axis of birefringent polarizing plate, 19... Direction of magnetic field, 20,
20'... Ordinary ray, 21, 21'... Extraordinary ray,
22... Characteristics of conventional one-stage optical isolator, 23... Characteristics of two-stage optical isolator according to the present invention, 24... Birefringent polarizing plate, 25... Birefringent polarizing plate, 26... 45 degree faraday rotor, 27
... Magnet, 28 ... Optical axis of birefringent polarizing plate, 29 ...
... wedge-shaped birefringent polarizing plate, 30... wedge-shaped birefringent polarizing plate, 31... wedge-shaped birefringent polarizing plate, 32... wedge-shaped birefringent polarizing plate, 33... 45 degree Faraday rotator, 3
4... 45 degree Faraday rotator, 35... Light traveling in the forward direction, 36... Light traveling in the reverse direction, 37... Direction of magnetic field.

補正昭６２．１０．２７図面の簡単な説明を次のように補正する。明細書の第１３頁第１８行に「２０，２０′…
…常光線、２１，２１′……異常光線、」とある
を「２０……複屈折偏光板９において常光となる
光、２０′……複屈折偏光板１２において常光と
なる光、２１……複屈折偏光板９において異常光
となる光、２１′……複屈折偏光板１２において
異常光となる光、」に訂正する。Amendment October 27, 1982 The brief description of the drawing is amended as follows. On page 13, line 18 of the specification, "20, 20'...
...ordinary ray, 21, 21'...extraordinary ray," is replaced with "20...light that becomes ordinary light in the birefringent polarizing plate 9, 20'...light that becomes ordinary light in the birefringent polarizing plate 12, 21... The light that becomes extraordinary light in the birefringent polarizing plate 9, 21'...the light that becomes extraordinary light in the birefringent polarizing plate 12.''

Claims

[Scope of utility model registration request]

In a two-stage optical isolator having a birefringent polarizing plate formed into a parallel flat plate, a Faraday rotator, and a magnet that applies a magnetic field to the Faraday rotator, a first birefringent polarizing plate and a second birefringent polarizing plate are provided. an optical isolator unit having a first Faraday rotator disposed between the third birefringent polarizing plate and the fourth optical isolator unit;
an optical isolator unit in which a second Faraday rotator is disposed between a birefringent polarizing plate and an optical isolator unit arranged in series in the direction in which light travels, and the optical axis direction of the second birefringent polarizing plate is A two-stage optical isolator characterized in that only the optical axis direction of the third birefringent polarizing plate coincides with that of the third birefringent polarizing plate.