Self-imaging waveguide optical polarization or wavelength splitt

Details Self-imaging waveguide optical polarization or wavelength splitt Self-imaging waveguide optical polarization or wavelength splitt

1998-07-06

1998-12-22

Sanghavi, Hemang

Optical waveguides

With optical coupler

Particular coupling structure

385 14, 385 43, 385 47, 385 27, G02B 626, G02B 642

Patent

active

058526919

ABSTRACT:
Three new techniques for the separation of orthogonally polarized light or ight of 2 arbitrary wavelengths by use of a waveguide optical device, based on either 1) simultaneous 1-by-1 and 1-by-2 self-imaging, or 2) simultaneous crossed and barred 1-by-1 off-center self-imaging, or 3) out-of-phase self-imaging. Simultaneous 1-by-1 and 1-by-2 self-imaging utilizes a waveguide optical polarization splitter having an input waveguide containing TE and TM, a multimode interference region, aligned so that TE and TM refractive indices are very different, and with the length set so that the polarization with the lower refractive index is singly self-imaged while the other polarization is doubly self-imaged, an output waveguide containing polarization with higher refractive index, and two additional output waveguides each containing half the power of the other polarization. Simultaneous crossed and barred 1-by-1 off-center self-imaging utilizes a waveguide optical polarization splitter having an input waveguide containing TE and TM, a multimode interference region, aligned so that TE and TM refractive indices are very different, and with the length set so that the polarization with the lower refractive index is bar self-imaged while the other polarization is cross self-imaged, an output waveguide containing polarization with higher refractive index, and another output waveguide containing the other polarization. Both of these methods may also be used to separate light of 2 arbitrary wavelengths. Out-of-phase self-imaging utilizes a waveguide optical polarization splitter having an input waveguide containing TE and TM, a 1-by-2 polarization-independent self-imaging power splitter, an intermediate waveguide of length L.sub.par containing TE and TM, an intermediate waveguide of length L.sub.par +2*L.sub.perp containing TE and TM, a 2-by-2 self-imaging coupler, and output waveguide containing TE only, and an output waveguide containing TM only.

REFERENCES:
patent: 4274706 (1981-06-01), Tangonan
patent: 5482698 (1996-01-01), Jenkins et al.
patent: 5640474 (1997-06-01), Tayag
patent: 5689597 (1997-11-01), Besse
patent: 5692992 (1997-12-01), Amersfoort et al.

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