Integreret optisk polarisationsstråledeler

摘要

The invention relates to a polarisation diplexer (polarisation beam-splitter) which consists of two waveguides (1, 2) which are to be coupled to one another and between which a further waveguide section (3) is arranged in a coupling region. The arrangement is dimensioned such that the coupling wave of the third waveguide section (3) is synchronous in phase with the waves in the two other waveguides (1, 2) at the desired coupling frequency. In addition, the first and the second waveguides (1, 2) are coupled to one another in each case only via the third waveguide section (3). Provision is made of a coating (4), made from an effectively conducting material such as a metal, which partially covers at least the waveguide section (3) and covers at most the waveguide section (3) and one of the waveguides (2) in the coupling region. Owing to the metal coating, the effective reflective index of the third waveguide section is reduced so strongly for the TM wave that the latter is not transferred into a waveguide coated with metal. The polarisation diplexer thus splits arbitrarily polarised light into the TM and TE waves. Such a polarisation diplexer can be applied, for example, in superheterodyne receivers having polarisation diversity.