Patent ID: 8675455
Filing Date: 2014-03-18
Classification: G11B

Abstract:
1. A system for controlling light phase at a near field transducer (NFT) of an interferometric waveguide, the system comprising: a laser; a heater configured to heat the laser; a splitter configured to receive light from the laser and to split the light into a first waveguide arm and a second waveguide arm, the first waveguide arm and the second waveguide arm converging at a junction opposite the splitter in a light propagating direction; and the near field transducer (NFT) proximate the junction and configured to receive the light, wherein the first waveguide arm is longer than the second waveguide arm by a preselected distance, and wherein the heater is configured to generate and maintain a preselected phase difference in the light arriving at the NFT via the first waveguide arm and the second waveguide arm.