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:
Apr. 17, 2007
Filed:
Apr. 24, 2002
Hernando Garcia, Freehold, NJ (US);
Daniel Charles Kilper, Fair Haven, NJ (US);
Jeffrey Matthew Roth, Lexington, MA (US);
Chunhui Xu, Piscataway, NJ (US);
Hernando Garcia, Freehold, NJ (US);
Daniel Charles Kilper, Fair Haven, NJ (US);
Jeffrey Matthew Roth, Lexington, MA (US);
Chunhui Xu, Piscataway, NJ (US);
Lucent Technologies Inc., Murray Hill, NJ (US);
Abstract
A photomultiplier module (PMT), preferably a PMT with a gallium arsenide (GaAs) photocathode, is used as a N-photon detector (N is an integer ≧2). The PMT detects the N-photon absorption rate of an optical signal having a wavelength range extending from 1.0 μm to an upper wavelength region that increases as the number of photons simultaneously absorbed by the PMT increases beyond two. The N-photon absorption rate is used by a signal compensation apparatus to reduce impairments which affect the rate, such as group velocity dispersion and/or polarization mode dispersion, in a received optical pulse communication signal. The N-photon absorption rate can also be used to determine the optical signal-to-noise ratio of a received optical pulse communication signal, and/or to synchronize a second optical pulse signal with the first optical signal.