Optical waveguides – Planar optical waveguide – Thin film optical waveguide
Patent
1995-08-29
1997-04-22
Lee, John D.
Optical waveguides
Planar optical waveguide
Thin film optical waveguide
385 11, 385 14, 385 27, G02B 6126
Patent
active
056235712
ABSTRACT:
A polarization compensated waveguide grating router is formed by reducing the thickness of the cladding material deposited over segments of waveguide cores to be on the order of the height of the vertical extension of the optical field of the waveguide. The resulting "air-patch" segments increase the birefringence in the patch segments of the waveguides. By using an air-patch length which is inversely proportional to the length of each waveguide, the correct phase relationship can be maintained between the different waveguides to produce an InP-based router which is polarization independent.
REFERENCES:
patent: 5136671 (1992-08-01), Dragone
patent: 5339157 (1994-08-01), Glance et al.
patent: 5341444 (1994-08-01), Henry et al.
patent: 5488680 (1996-01-01), Dragone
patent: 5506925 (1996-04-01), Greene et al.
patent: 5515460 (1996-05-01), Stone
B. H. Verbeek et al., "Large Bandwidth Polarisation Independent and Compact 8 Channel PHASAR Demultiplexer/Filter," OFC '94, Feb. 1994, paper PD 13-1. Cited in application; technological background of the invention.
M. Zirngibl et al., "Polarisation Endependent 8.times.8 Waveguide Grating Multiplexer On InP," Electronics Letters, 21 Jan. 1993, vol. 29, No. 2, pp. 201-202. Cited in application; technological background of the invention.
Chou Patrick C.
Joyner Charles H.
Zirngibl Martin
Lee John D.
Lucent Technologies - Inc.
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