Low loss and low polarization dependence waveguide variable...

Details Low loss and low polarization dependence waveguide variable... Low loss and low polarization dependence waveguide variable...

G - Physics

02

B

G02B 6/27 (2006.01) G02F 1/313 (2006.01) H04B 10/18 (2006.01)

Patent

CA 2386331

A waveguide variable optical attenuator using a pair of waveguide 3dB couplers configuration and having polarization dependence compensators is proposed in this invention. This pair of 3dB couplers forms a Mach-Zehnder interferometer where a pair of cross-state input port and output port is used. Because the access loss of a 3dB coupler is much less than that of a Y-junction, the system loss of the variable optical attenuator based on this invention is much less than that of the other typical structure of the variable optical attenuators based on a pair of Y-junctions. Generally, the polarization dependent loss is a vital issue for a variable optical attenuator with either the 3dB couplers structure or the Y-junctions structure during it is being attenuated. In this invention, one or two polarization dependence compensators are made before each 3d8 coupler to correct any polarization dependent loss to the acceptable level. Therefore, the waveguide variable optical attenuator based on this invention can have low system loss and low polarization dependent loss.

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