Optical waveguides – With optical coupler – Particular coupling structure
Patent
1993-06-22
1994-06-14
Bovernick, Rodney B.
Optical waveguides
With optical coupler
Particular coupling structure
385 39, 385 40, 385 42, G02B 626
Patent
active
053217829
ABSTRACT:
A directional coupler type optical function element with a 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. Moreover, by forming the central partial junction with a proper length, the extinction ratio for a through mode can be kept high enough. Thus, high extinction ratio characteristics can be enjoyed for both of the cross and through modes.
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Mugino Akira
Yanagawa Hisaharu
Barns Stephen W.
Bovernick Rodney B.
Furukawa Electric Co. Ltd.
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