Polarization-independent acousto-optic tunable filter

Details Polarization-independent acousto-optic tunable filter Polarization-independent acousto-optic tunable filter

1997-05-17

2000-01-18

Epps, Georgia

Optical: systems and elements

Optical modulator

Light wave temporal modulation

359286, 359305, 359308, G02F 111, G02F 133

Patent

active

060162163

ABSTRACT:
A polarization independent acousto-optic tunable filter (PIAOTF) used for multiwavelength switching and routing in wavelength division multiplexing (WDM) networks. In the PIAOTF an incident unpolarized light beam is divided to propagate and to be diffracted along two polarization division branches. By using polarization converters and equal optical paths for the two polarization division channels, a PIAOTF is created which minimizes polarization dependent loss and polarization mode dispersion. Furthermore, a preferred embodiment of the AOTF using an elongated acousto-optic interaction medium is described that provides the additional advantages of narrow bandwidth, lower drive power and easier alignment.

REFERENCES:
patent: 4699466 (1987-10-01), Brandstetter et al.
patent: 5359451 (1994-10-01), Gelbart et al.
patent: 5410371 (1995-04-01), Lambert
patent: 5485272 (1996-01-01), Dirksen et al.
patent: 5611004 (1997-03-01), Chang et al.

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