Symmetrical waveguide coupler

Details Symmetrical waveguide coupler Symmetrical waveguide coupler

1984-06-22

1987-03-24

Sikes, William L.

350 9613, G02B 628

Patent

active

046520767

ABSTRACT:
A symmetrical waveguide coupler having two signal channels for coupling a first signal having a wavelength .lambda..sub.1 and a second signal having a wavelength .lambda..sub.2 which is longer than .lambda..sub.1. The coupler includes a carrier substrate and first and second dielectric strips embedded in the substrate to form two identical dielectric waveguides which together with the substrate define a coupling region. The first waveguide has first and second arms connected to the coupling region and the second waveguide has a third arm connected to the coupling region. The second and third arms are oriented in a direction facing away from the first arm. The dielectric strips are so dimensioned and arranged within the substrate as to present an effective coupling length c.sub.1 L.sub.1 equal to .pi./.sub.2 at a wavelength of .lambda..sub.1 for coupling the first signal between the first and third arms and an effective coupling length c.sub.1 L.sub.1 equal to .pi. at a wavelength of .lambda..sub.2 for coupling the second signal between the first and second arms, with c.sub.1 being the coupling coefficient between the fundamental modes of the signals in the strips and a function of wavelength, and L.sub.1 being the length of the coupling region.

REFERENCES:
patent: 3589794 (1971-06-01), Marcatili
patent: 3920314 (1975-11-01), Yajima
patent: 3957341 (1976-05-01), Taylor
patent: 4153328 (1979-05-01), Wang
patent: 4461535 (1984-07-01), Marcatili
patent: 4483582 (1984-11-01), Sheem
patent: 4483583 (1984-11-01), Unger

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