Patent ID: 6954566
Filing Date: 2005-10-11
Classification: G02B

Abstract:
1. An arrayed waveguide grating comprising: an array of waveguides, the array having an input end for receiving an input signal and an output end coupled to an output region at which an interference pattern of the input signal is provided; a free propagation region coupled to the input end, the free propagation region including a first section and a second section being movable relative to one another within a longitudinal plane containing a direction of propagation to controllably adjust the position of the interference pattern in the output region, an inner face of the first section and an inner face of the second section having a Θ-cut, as determined from a plane extending orthogonally to the longitudinal plane and forming an angle Θ with the direction of propagation, with a Θ less than 90°, and the inner face of the first section and the inner face of the second section having a Φ-cut, as determined from a plane extending out of the longitudinal plane at an angle Φ, with the Φ greater than 0° and less than 90°: a spring positioned to longitudinally bias the first section toward the second section; and a thermally responsive actuator for moving the first portion and the second portion relative to one another in response to a thermal change.