The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Nov. 20, 2001
Filed:
Feb. 15, 2001
David A. G. Deacon, Los Altos, CA (US);
Sparkolor Corporation, Santa Clara, CA (US);
Abstract
Tunable add-drop and cross connect devices include materials with negative dependence of refractive index on temperature and temperature independent coincidence between resonator modes and a set of specified frequencies, e.g. for DWDM telecommunications channels. The free spectral range may be adjusted to equal a rational fraction of the specified frequency interval. The operating frequency may be selected without substantially tuning the cavity modes by a thermo-optically tuned feedback element. This can be accomplished by means of a waveguide pair with differential thermal response. Tuning may also be accomplished by applying an electric field across an electro-optic liquid crystal portion of a waveguide pair. The resonator and coupled waveguide pair arrangement may be used as a communications signal receiver where the coupling strength is optical frequency tuned by the applied thermal or electrical field.