Polarization filter with intermediate optical waveguide which is

Details Polarization filter with intermediate optical waveguide which is Polarization filter with intermediate optical waveguide which is

1992-07-01

1993-10-26

Gonzalez, Frank

Optical waveguides

Polarization without modulation

385 14, 385 42, 385 50, G02B 612, G02B 626

Patent

active

052573303

ABSTRACT:
Polarization filter for delivering an output signal So containing only one (TE or TM) of the two polarizations (TE and TM) in an input signal Si, comprising an intermediate guide section (5) between an input section (A) and an output section (B). The output section (B) is a mode splitter having a monomodal output channel (3) for the output signal (S.sub.o) and a monomodal dummy channel (4) which recedes beyond the interaction distance (D). The output channel (3) has a lower propagation constant than the dummy channel (4). The input section (A) having an input channel (1) and a dummy channel (2) is an inverse mode splitter which may be the mirror image of the output section (B). The guide section (5) is monomodal for one of the two polarizations and bimodal for the other polarization. Both polarizations of the input signal S.sub.i entering via the input channel (1) are initially converted into first-order modes, of which only one is a guided mode of that conductor section and reaches the output section, where it propagates further along the channel having the lowest propagation constant. The first-order mode of the other polarization escapes (6).

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