Non-reciprocal optical waveguide coupling device

Details Non-reciprocal optical waveguide coupling device Non-reciprocal optical waveguide coupling device

1995-08-09

1996-12-24

Ngo, John

Optical waveguides

With optical coupler

Input/output coupler

372703, G02B 626

Patent

active

055880789

ABSTRACT:
A non-reciprocal optical device for interconnecting single mode optical fiber waveguides so that a light beam can pass between the fibers in a forward direction but a reverse beam, such as might be caused by unwanted reflections, is displaced away the input fiber, includes a focussing lens unit and at least one non-reciprocal optical element in series between respective ends of an input optical fiber and an output optical fiber. The focussing lens unit has a focal length such that a light beam from the input optical fiber will be focussed onto the end of the output optical fiber. The focussing lens unit may comprise, for example, a half-pitch grin-rod lens. The non-reciprocal device is positioned adjacent one or other of the foci of the focussing lens unit. The focussing lens unit may comprise several lens elements, for example a pair of quarter pitch collimating lenses, allowing additional optical elements, such as filters, to be interposed. An isolator/wavelength division multiplexing hybrid device is formed by interposing a wavelength-division multiplexing filter and arranging the geometry so that different wavelength light beams are coupled to different output fibers. High isolation and low insertion loss are achieved in a compact device because the non-reciprocal device is placed where the width of the light beams is small.

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