Optical waveguide device having a double-refractor at an input t

Details Optical waveguide device having a double-refractor at an input t Optical waveguide device having a double-refractor at an input t

1996-09-30

1999-07-13

Sanghavi, Hemang

Optical waveguides

Polarization without modulation

385 8, 385 28, 385 29, 385 49, G02B 626, G02F 1295

Patent

active

059237953

ABSTRACT:
An optical waveguide device comprises: a waveguide substrate with a waveguide created therein; optical fibers optically linked to the waveguide at both end surfaces of the waveguide; and a double-refraction means provided at the one end surface for splitting an incident light into normal and abnormal lights. A rutile plate stuck to an end surface of the waveguide is used as an actual double-refraction means for arbitrarily selecting an incident light hitting the waveguide and splitting the incident light into normal and abnormal components. By providing rutile plate having a double-refraction effect such as the rutile plate on the end surface of the waveguide, a difference in phase between optical paths is resulted in due to polarization of the incident light, making separation into TE and TM modes possible. By optically linking lights split and radiated in the rutile plate to the incident end surface of the waveguide, any arbitrary polarization light can be applied to the waveguide.

REFERENCES:
patent: 5037205 (1991-08-01), Pavlath
patent: 5259044 (1993-11-01), Isono et al.
patent: 5483609 (1996-01-01), Nakaya
patent: 5499307 (1996-03-01), Iwatsuka
patent: 5611004 (1997-03-01), Chang et al.
N. Goto et al.; "A TE-TM Mode Splitter in LiNbO.sub.3 by Proton Exchange and Ti Diffusion"; Journal of Lightwave Technology, vol. 7, No. 10, Oct. 1989, pp. 1567-1574.
A. Neyer; "Low-crosstalk passive polarization splitters using Ti:LiNbO.sub.3 wave-guide crossings"; Appl. Phys. Lett. 55(10), Sep. 4, 1989; pp. 927-929.

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