Polarization-independent optical wavelength selective coupler

Details Polarization-independent optical wavelength selective coupler Polarization-independent optical wavelength selective coupler

1995-01-13

1996-02-27

Ullah, Akm E.

Optical waveguides

With optical coupler

Input/output coupler

G02B 636

Patent

active

054955432

ABSTRACT:
A double-periodic grating is described for obtaining polarization-independent filtering and coupling. The grating may be viewed as a combination of two gratings with slightly different grating periods. The two periods are carefully chosen to match the difference in propagation constants of the TE and TM polarization modes such that both modes are coupled at the same wavelength.
A novel method of obtaining a double-periodic grating is described.

REFERENCES:
patent: 4750801 (1988-06-01), Alferness
patent: 4966431 (1990-10-01), Heismann
patent: 4984863 (1991-01-01), Parriaux et al.
patent: 5022730 (1991-06-01), Cimini et al.
patent: 5058977 (1991-10-01), Sorin
patent: 5093876 (1992-03-01), Henry et al.
patent: 5325392 (1994-06-01), Tohmori et al.
patent: 5337183 (1994-08-01), Rosenblatt
"Grating-assisted InGaAsP/InP vertical codirectional coupler filter" by R. C. Alferness et al., 6 Nov. 1989, Appl. Phys. Lett. 55(19) pp. 2011-2013.
"Vertically coupled InGaAsP/InP buried rib waveguide filter" by R. C. Alferness, 11 Nov. 1991, Appl. Phys. Lett. 59 (20), pp. 2573-2575.

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