Waveguide type grating device

Details Waveguide type grating device Waveguide type grating device

1998-05-01

1999-11-30

Palmer, Phan T. H.

Optical waveguides

With optical coupler

Input/output coupler

385 28, 385 31, 385123, 385 27, G02B 634

Patent

active

059956917

ABSTRACT:
A waveguide type grating device according to the invention includes a quartz substrate, a cladding and two waveguides. Waveguides are arranged to provide an input port, an Add port, an output port, a Drop port, directional 3 dB couplers, core width-changing portions, and grating portions each interposed between core width-changing portions. The width of core is changed between each non-grating portion and each grating portion in an adiabatic structure, for example, a parabolic structure. For this structure, a waveguide type grating device is structured to suppress the increase in wavelength loss due to coupling from progressive propagation mode to regressive radiation mode, with less cost and smaller dimension.

REFERENCES:
patent: 5732170 (1998-03-01), Okude et al.

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