G - Physics – 02 – B
Patent
G - Physics
02
B
G02B 6/26 (2006.01) G02B 27/10 (2006.01) G02F 1/313 (2006.01)
Patent
CA 2058777
ABSTRACT OF THE DISCLOSURE Provided is a directional coupler type optical function element with high extinction ratio, in which a junction of a 2-input/2-output directional coupler or 1-input/2-output directional coupler, formed of a semiconductor or dielectric, is formed by successively optically connecting, from the input side to the output side, a front-stage partial junction, front- stage partial junction with electrode, central partial junction, rear-stage partial junction with electrode, and rear-stage partial junction, each having a predetermined length. The connection state at the front-stage partial junction and an incidence-side lead section optically connected thereto and the connection state at the rear-stage partial junction and an emergence-side lead section optically connected thereto cancel each other, thereby equivalently providing a symmetrical connection state and preventing the extinction ratio for a cross mode from lowering. By forming the central partial junction with a proper length, moreover, the extinction ratio for a through mode can be kept high enough. Thus, high extinction ratio characteristics can be enjoyed for either of the cross and through modes.
Mak Hon-Ming
Yanagawa Hisaharu
Smart & Biggar
The Furukawa Electric Co. Ltd.
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