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:
May. 21, 2002
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 refractive index dependence on temperature and temperature independent coincidence between modes of an athermal ring resonator 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 resonator modes by a thermo-optically tuned feedback element having a waveguide pair with differential thermal response. The operating frequency may be induced to hop digitally between the specified frequencies.