Chandra S Jasti

6980357, Dec 27, 2005

Feb 13, 2004

10/779560

Chandra Sekhar Jasti - Cupertino CA, US
Hermann Gysel - Cambria CA, US
Mani Ramachandran - San Jose CA, US

General Instrument Corporation - Horsham PA

H01S003/00

359349

An optical amplifier () splits an optical signal into two signals (). A first amplifier section () receives the first signal (). The first amplifier section () includes a first optical fiber (), having a first input, for generating a first output power (), and a first pump source () is coupled to the first input, for supplying a first energy amount to the first optical fiber (). The optical amplifier () also includes a second amplifier section () to receive the second signal (), which is arranged in parallel to, and under common control with, the first amplifier section (). The second amplifier section () includes a second optical fiber (), having a second input, for generating a second output power (), and a second pump source () is coupled to the second input, for supplying a second energy amount to the second optical fiber (). A total power () of the first output power () and the second output power () is at least about 600 mill Watts.

7024110, Apr 4, 2006

Jul 21, 2005

11/186467

Chandra Sekhar Jasti - Cupertino CA, US

General Instrument Corporation - Horsham PA

H04B 10/00
H04B 10/08
H04B 17/00
H04J 14/00

398 5, 398 19, 398 25, 398 33

Optical switches are provided in an optical transmission system having at least two optical nodes in optical communication over a primary optical path and a backup optical path. An optical switch is located in each of the optical nodes. Each of the optical switches includes a switching element having an input port and a plurality of output ports coupled to the primary and backup optical paths, respectively. The switching element has a first state optically coupling an optical signal from the input port to the primary path and a second state optically coupling an optical signal from the input port to the backup path. First and second optical taps are located in the primary optical path. Third and fourth optical taps are located in the backup optical path. A first photodetector is optically coupled to the second optical tap for receiving a portion of the optical signal traveling in the primary optical path. A second photodetector is optically coupled to the third optical tap for receiving a portion of the optical signal traveling in the secondary optical path.

7119948, Oct 10, 2006

Oct 13, 2005

11/249250

Chandra Sekhar Jasti - Cupertino CA, US
Hermann Gysel - Cambria CA, US
Mani Ramachandran - San Jose CA, US

General Instrument Corporation - Horsham PA

H01S 3/00

3593411, 359349

An optical amplifier () splits an optical signal into two signals (). A first amplifier section () receives the first signal (). The first amplifier section () includes a first optical fiber (), having a first input, for generating a first output power (), and a first pump source () is coupled to the first input, for supplying a first energy amount to the first optical fiber (). The optical amplifier () also includes a second amplifier section () to receive the second signal (), which is arranged in parallel to, and under common control with, the first amplifier section (). The second amplifier section () includes a second optical fiber (), having a second input, for generating a second output power (), and a second pump source () is coupled to the second input, for supplying a second energy amount to the second optical fiber (). A total power () of the first output power () and the second output power () is at least about 600 mill Watts.

7151875, Dec 19, 2006

Aug 11, 2003

10/638972

Chandra Sekhar Jasti - Cupertino CA, US
Hermann Gysel - San Jose CA, US
Mani Ramachandran - San Jose CA, US

General Instrument Corporation - Horsham PA

G02B 6/42
H04J 14/02

385 48, 398 68, 398 83

A method and apparatus is provided for power balancing an optical signal wavelength to be added to an OADM having at least one drop port and at least one add port. The method begins by monitoring a power level of a first signal wavelength being dropped on the drop port and a power level of a second signal wavelength being added on the add port. The power level of the first signal wavelength is compared to the power level of the second signal wavelength. Based on the step of comparing, the optical attenuation is adjusted along the add port so that the power level of the second signal wavelength becomes substantially equal to the power level of the first signal wavelength.

7289728, Oct 30, 2007

Mar 11, 2004

10/798706

Shamino Y. Wang - San Jose CA, US
Chandra S. Jasti - Cupertino CA, US

General Instrument Corporation - Horsham PA

H04B 10/00
H04B 10/08
H04J 14/00

398 5, 398 1, 398 19, 398 25, 398 33, 398 17, 385 16, 385 24, 385 34, 385 45

The disclosure is directed toward an optical transmission system comprising a primary path disposed between a first end and a second end. The primary path is configured to transmit optical signals between the first end and the second end. A secondary path is disposed between the first end and the second end. The secondary path is configured to transmit optical signals between the first end and the second end, e. g. , in the event of a break in the primary path. A first variable ratio coupler is coupled to the primary path and the secondary path between the first end and the second end. The first variable ratio coupler is configured to adjust a coupling ratio between the primary path and the secondary path.

7366416, Apr 29, 2008

Aug 11, 2003

10/638954

Mani Ramachandran - San Jose CA, US
Chandra Sekhar Jasti - Cupertino CA, US

General Instrument Corporation - Horsham PA

H04J 14/00

398 71, 398 66, 398 67, 398 68, 398 70, 398 72, 398 58, 398 59, 398 79, 398 82, 398 83, 398 33, 398 38, 398 37, 398 92, 398147, 398157, 398158, 398160, 398177, 398192, 398197, 385 24, 385 39, 385 37

A hub for use in a passive optical network (PON) includes a transmission fiber on which an information-bearing optical signal is received, a double-cladded, rare-earth doped fiber located along the transmission fiber for imparting gain to the information-bearing optical signal, and a combiner having an output coupled to the transmission fiber and a plurality of inputs. The output is coupled to the transmission fiber such that optical energy at pump energy wavelengths but not signal wavelengths are communicated therebetween. At least one pump source is optically coupled to one of the inputs of the combiner for providing optical pump energy to the double-cladded, rare-earth doped fiber. An optical splitter is also provided. The optical splitter has an input coupled to the transmission fiber for receiving an amplified, information-bearing optical signal and a plurality of outputs for directing portions of the amplified, information-bearing optical signal to remote nodes in the PON.

7369777, May 6, 2008

Nov 20, 2003

10/718073

Chandra Sekhar Jasti - Cupertino CA, US
Hermann Gysel - San Jose CA, US
Mani Ramachandran - San Jose CA, US

General Instrument Corporation - Horsham PA

H04B 10/12

398147, 398148, 398149, 398158, 398159, 398 79, 398 81, 398 25, 398 26, 398 27, 398 28, 398 29, 398 33, 398 38, 385 24, 385 37, 385 11, 385 27, 385 31

A dispersion compensator is provided that includes an input port for receiving a WDM optical signal and a dispersion compensating element coupled to the input port for substantially compensating the WDM optical signal for dispersion that has accumulated along an external transmission path. The dispersion compensator also includes an output port for directing the dispersion compensated WDM optical signal to an external element and a dynamic power controller for maintaining a total power of the WDM signal below a prescribed level prior to receipt of the WDM optical signal by the dispersion compensating element.

7936997, May 3, 2011

May 2, 2007

11/800063

Mani Ramachandran - San Jose CA, US
Hermann Gysel - San Jose CA, US
Chandra Jasti - San Jose CA, US

Innotrans Communications, Inc. - San Jose CA

H04B 10/12

398193, 398192, 398194

A directly modulated optical transmitter for use with a fiber optical communications system operating in the 1550 nm wavelength band exhibits very low chirp. The chirp inherently present in a directly modulated laser is cancelled by a phase modulator which optically modulates the directly modulated laser light beam by applying a 180 phase delay to a split-off portion of the input radio frequency signal. This provides a low cost transmitter capable of operating in the 1550 nm band and with laser chirp effectively cancelled or substantially reduced, thereby avoiding distortions due to laser chirp interactions with the downstream optical fiber.