| GEMFIRE CORPORATION Patent applications |
| Patent application number | Title | Published |
|---|
| 20110229080 | OPTICAL DEVICE WITH ATHERMAL SLOTS FOR TEMPERATURE DEPENDENCE CURVATURE REDUCTION - In one aspect of the invention, roughly stated, Applicants have discovered that a compensation material within slot elongated in a direction parallel to a segment of waveguide in an arrayed waveguide grating apparatus can compensate for both first and second order change in refractive index of the base waveguide material over temperature. Unlike the transverse slots of conventional linear athermalization techniques, the elongated slot generally parallel to the base material defines a composite waveguide section having a second order effective index of refraction temperature dependency which can be utilized to accurately minimize the temperature dependence of the overall optical path length to both the first and second order. The techniques described herein are also generalizeable to neutralization of the optical path length temperature dependence to any order. | 09-22-2011 |
| 20080226232 | OPTICAL DEVICE WITH REDUCED TEMPERATURE DEPENDENCE - Optical apparatus with improved center wavelength temperature stability. In an embodiment, an AWG has a plurality of slots inserted along the optical paths. The slots contain one or more compensation materials which collectively correct for an order Q temperature dependency of the AWG base material. Q>=2 or the number of compensation materials is at least 2 or both. | 09-18-2008 |
