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| Number | Title | Issue Date |
| 8155516 | Apparatus and method for ensuring continuity of fiber optic In a fiber-optic communications system, a backup or redundant optical link is provided at the central office in parallel with the primary one in use. Parameters associated with the backup link, including its signal delay, its attenuation, etc. are stored at the time... | 04/10/2012 |
| 8000605 | Synchronous OTDM: gapped clock creation and duty cycle multiplication Methods and apparatus for implementing synchronous Optical Time Division Multiplexing are presented. Namely, a method of upconverting and combining N input NRZ optical data signals, each having an approximately equal pulse width and period, into one time-division mu... | 08/16/2011 |
| 7987412 | Reed Solomon decoding of signals having variable input data rates A method and apparatus to achieve a resource optimized, class of Reed Solomon decoders, featuring balanced pipelined stages and parallel algorithmic components. The Reed Solomon decoder has two pipeline stages, with one stage implementing syndrome computation and th... | 07/26/2011 |
| 7924498 | System and method for optical communication using polarization filtering An optical circuit is described which may include an SOA-MZI circuit providing an output signal; and a polarization filtering device (PFD) configured to receive the output signal of the SOA-MZI and to provide at least one signal at the output of the PFD. ... | 04/12/2011 |
| 7916385 | Apparatus and methods for optical communication An optical circuit is disclosed, which may include a semiconductor optical amplifier (SOA); an optical filter operable to filter light emerging from the SOA; and a PIN for converting the light output from the optical filter into an electrical signal, wherein the gai... | 03/29/2011 |
| 7633674 | SOA-MZI device fault isolation A photonic integrated circuit having a plurality of circuit components, is disclosed, which may include an MMI for splitting signal power passing therethrough among first and second optical pathways coupled to first and second outputs, respectively, of the MMI, ther... | 12/15/2009 |
| 7440179 | SOA-MZI device fault isolation The method of isolating faults internal to, for example, from tonic integrated circuits by diverting a portion of certain input and output signals to integrated photo detectors. By analyzing the admitted optical signal in each of plural photo detectors, falls within... | 10/21/2008 |
| 7319555 | Integrated performance monitoring, performance maintenance, and failure detection for photonic regenerators Monitoring of the input power is performed on-chip and is used to monitor and maintain performance, detect failure and trigger network protection strategies. An optical power-monitoring technique uses a photodetector monolithically integrated with the semiconductor ... | 01/15/2008 |
| 7239768 | Photonic integrated circuit A integrated optical circuit comprises an interferometer having a first optical path and a second optical path configured for regenerating an input signal entering the first path by interference at a first coupler between continuous wave (CW) signals from the two op... | 07/03/2007 |
| 7203427 | Redundant path all-optical regeneration, reshaping and wavelength conversion for enhanced yield A system, method and device for AO2R is presented. The AO2R system presented is redundant, containing multiple pathways for the input and output signals to travel. The system carries out both the regeneration and reshaping functions in the optical domain, and return... | 04/10/2007 |
| 7190909 | Generation and detection of optical maintenance signals in optical networks Method and apparatus are presented for the generation and detection of maintenance signals in an optical data network. The maintenance signals are such that they can be read both by high bit-rate and low bit-rate receivers. Detection of the maintenance signals occur... | 03/13/2007 |
