To correct defects in a conventional receptacle type optical module that is structured such that, for suppressing reflection return light, a short stab with a dummy fiber inserted is prepared, with the end face grounded obliquely, and force-fitted into a through hole of a receptacle, that the light reflected on the end face of the dummy fiber travels obliquely, with the return light to a semiconductor laser prevented by bending the optical path of the reflected light, and that, for the purpose of putting the stab in the receptacle hole, the machining of the receptacle hole and the stab require high dimensional accurtacy, moreover difficulty in assembling.
A small Faraday rotator is provided in an internal space of the receptacle and the holder. Since polarization plane is rotated, an oscillation state holds stable, even if back-reflection light goes back to the laser. As the module is put in the internal space and fixed, a small size one will do, causing only a small increase in the component cost. Since there is no need for force-fitting the member precisely in a narrow hole, assembling cost will not increase.
COPYRIGHT: (C)2006,JPO&NCIPI
Kenji Hirayama
Takeshi Okada
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