Multi-beam generating device and optical recording device...

Optical waveguides – With optical coupler – Particular coupling structure

Reexamination Certificate

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Details

C385S032000, C385S043000, C385S050000, C385S132000

Reexamination Certificate

active

07542642

ABSTRACT:
A multi-beam generating device has plural semiconductor lasers, optical fibers to propagate laser beams generated by the semiconductor lasers, an optical fiber array to propagate the laser beams passed through the optical fibers, and an optical waveguide device provided with waveguides to propagate the laser beams having passed through the optical fiber array. Each of the waveguides has a core layer and a clad layer; a pitch between adjacent waveguides in the arrangement is narrower on the output section side where the laser beams emit than on the input section side where the laser beams enter; a width of the core layer is narrower in the transverse direction that is the direction of the arrangement of the waveguides than in the vertical direction; and a difference in refractive index between the core layer and the clad layer is larger in the transverse direction than in the vertical direction.

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Y. Ishii, et al.; Reduction of bending loss by area-selective deposition method; Optics and Electronics Laboratory, Fujikura Ltd.; Electronics 1, The Proceeding of the General Convention of the Institute of Electronics, Information and Communication Engineers published in 1998; pp. 1-2 and pp. 314.

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