Multi-wavelength filter that is insensitive to polarization with

Details Multi-wavelength filter that is insensitive to polarization with Multi-wavelength filter that is insensitive to polarization with

1996-04-04

1998-11-03

Ullah, Akm E.

Optical waveguides

Polarization without modulation

G02B 600

Patent

active

058321462

ABSTRACT:
The invention relates to a multi-wavelength filter that is insensitive to polarization, comprising a bundle of optical waveguides made on a common substrate and organized in such a manner that the wavelength response of the filter depends on the phase shifting to which the light propagating in the waveguides is subject. The filter also comprises polarization rotators placed on the path of the light in such a manner that in each of the optical waveguides the light paths for the TE and TM polarization modes are of equal length. The polarization rotators are of the type comprising means for loading each optical waveguide and for creating asymmetry in the effective refractive index thereof.

REFERENCES:
patent: 4761049 (1988-08-01), Burns et al.
patent: 4779277 (1988-10-01), Gover et al.
patent: 5185828 (1993-02-01), Van Der Tol

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