Peter D Evans

US Patent:

7394953, Jul 1, 2008

Filed:

Apr 11, 2007

Appl. No.:

11/734259

Inventors:

Radhakrishnan L. Nagarajan - Cupertino CA, US
Masaki Kato - Sunnyvale CA, US
Peter W. Evans - Mountain House CA, US
Jacco L. Pleumeekers - Mountain View CA, US
Mehrdad Ziari - Pleasanton CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

G02B 6/34
G02B 6/26
G02B 6/42

US Classification:

385 37, 385 14, 385 15, 385 31, 385 46, 385 50, 25022711, 25022723

Abstract:

System, devices and methods are described that provide an integrated optical decombiner or optical combiner having both unamplified paths and amplified paths on which power monitoring and control may be located. A preferred multiplexing/demultiplexing optical path through the combiner/decombiner and a corresponding waveguide output/input is identified and optically coupled to a piece of fiber. Temperature control may be provided to tune an arrayed waveguide grating within the combiner/decombiner and minimize wavelength drift therein. Integrated power monitoring may be employed on one or more of the amplified waveguide paths to ensure that a preferred power level or range is maintained on an optical signal.

US Patent:

7398194, Jul 8, 2008

Filed:

Aug 25, 2006

Appl. No.:

11/510430

Inventors:

Peter B. Evans - Los Altos Hills CA, US
Steven E. Schumer - San Jose CA, US

International Classification:

G06G 7/62
G06G 7/48
G06G 7/00
G06F 17/50
G06F 19/00
G01R 15/00
G05B 13/02
G05B 13/00

US Classification:

703 18, 702 57, 700 29, 700286, 700291

Abstract:

An improved method for analyzing power systems; in particular, power systems that may incorporate distributed energy resources (DER), that provides a thorough determination of the potential for network performance improvement that DER could provide, independent of non-network benefits DER could provide. The method incorporates an Energynet dataset simulating the power system, integrating transmission and distribution elements together and capable of evaluating the impacts of additions of real energy sources and/or reactive energy sources anywhere in the network. Such energy source additions are evaluated for their impact on a broad set of performance measures. The specific DER projects that would realize that potential improvement in network performance are characterized as an Optimal DER Portfolio. Network performance improvement attributable to the Optimal DER Portfolio is quantified in engineering and financial terms.

US Patent:

7860702, Dec 28, 2010

Filed:

Sep 17, 2003

Appl. No.:

10/666209

Inventors:

Peter B. Evans - Los Altos Hills CA, US
Steven E. Schumer - Santa Clara CA, US

International Classification:

G06G 7/62
G06G 7/48
G06G 7/00
G06F 17/50
G06F 19/00
G01R 15/00
G05B 13/02
G05B 13/00

US Classification:

703 18, 702 57, 700 29, 700286, 700291, 703 2, 703 13

Abstract:

An improved method for analyzing power systems; in particular, power systems that may incorporate distributed energy resources (DER), that provides a thorough determination of the potential for network performance improvement that DER could provide, independent of non-network benefits DER could provide. The method incorporates an Energynet dataset simulating the power system, integrating transmission and distribution elements together and capable of evaluating the impacts of additions of real energy sources and/or reactive energy sources anywhere in the network. Such energy source additions are evaluated for their impact on a broad set of performance measures. The specific DER projects that would realize that potential improvement in network performance are characterized as an Optimal DER Portfolio. Network performance improvement attributable to the Optimal DER Portfolio is quantified in engineering and financial terms.

US Patent:

8111996, Feb 7, 2012

Filed:

Feb 23, 2009

Appl. No.:

12/391027

Inventors:

Masaki Kato - Palo Alto CA, US
Charles H. Joyner - Sunnyvale CA, US
Radhakrishnan L. Nagarajan - Cupertino CA, US
Peter W. Evans - Mountain House CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

H04B 10/00

US Classification:

398 87, 398200

Abstract:

Consistent with the present disclosure, an arrayed waveguide grating (AWG) is provided that includes first inputs and second inputs. Each of the first inputs receives a corresponding one of a plurality of first optical signals, each of which has a corresponding one of a plurality of wavelengths. Second inputs are also provided, such that each second input is preferably provided between two adjacent first inputs. Each of the second inputs receives a corresponding one of a plurality of second optical signals, and each of the second plurality of optical signals has a corresponding one of those wavelengths. Each of the first plurality of optical signals, however, has a first polarization and each of the second plurality of optical signals has a second polarization different than the first polarization. Since the first optical signals are supplied through AWG inputs that are offset from the inputs that receives second optical signals, the first optical signals are supplied at a first AWG output that is spaced from a second AWG output that supplies the second optical signals. The second optical signals are supplied through the second output even though the second optical signals have the same (or substantially the same) wavelengths as the first optical signals.

US Patent:

8233510, Jul 31, 2012

Filed:

Feb 2, 2009

Appl. No.:

12/363826

Inventors:

Charles H. Joyner - Sunnyvale CA, US
Radhakrishnan L. Nagarajan - Cupertino CA, US
Peter W. Evans - Mountain House CA, US
Masaki Kato - Palo Alto CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

H01S 3/10

US Classification:

372 26, 372 29021, 372 96, 398184

Abstract:

A dual output laser source provided on a substrate outputs light from a first and second output. A portion of the light generated by the laser is supplied to a first modulator via the first output. A second portion of the light generated by the laser is supplied to a second modulator via the second output. The first modulator is provided on the substrate and generates a first modulated signal. The second modulator is also provided on the substrate and generates a second modulated signal. Each output of the laser is used to provide continuous wave light sources to components on photonic integrated circuit.

US Patent:

8238759, Aug 7, 2012

Filed:

Dec 29, 2008

Appl. No.:

12/345315

Inventors:

Charles H. Joyner - Sunnyvale CA, US
Radhakrishnan L. Nagarajan - Cupertino CA, US
Masaki Kato - Palo Alto CA, US
Peter W. Evans - Mountain House CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

H04B 10/04

US Classification:

398183, 398184, 398188

Abstract:

A high capacity optical transmitter implemented on a photonic integrated circuit chip comprises a single light source which supplies a continuous wave having a particular wavelength to a plurality of modulators to form modulated optical information signals. A phase shifter is coupled to at least one of the modulators and is used to shift the phase of the corresponding modulated optical information signal associated with a particular modulator. A polarization beam combiner receives each of the modulated optical information signals from the modulators and the modulated optical information signal from the phase shifter and combines each of these signals to form a polarization multiplexed differential quadrature phase-shift keying signal. The light source, the plurality of modulators, the phase shifter and the polarization beam combiner are all integrated on the chip.

US Patent:

8260096, Sep 4, 2012

Filed:

May 15, 2009

Appl. No.:

12/466935

Inventors:

Charles H. Joyner - Sunnyvale CA, US
Peter W. Evans - Mountain House CA, US
Scott Corzine - Sunnyvale CA, US
Masaki Kato - Palo Alto CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

G02B 6/12

US Classification:

385 14

Abstract:

Consistent with the present disclosure, the number of passive waveguides in a PIC are reduced by directly connecting active components to one another. Accordingly, optical signals propagating in the PIC may experience less loss, and, thus, improved performance may be achieved. In addition, active components may be bent or curved in order to obtain a more compact layout with greater device density. Reduced manufacturing costs can therefore be realized.

US Patent:

8269297, Sep 18, 2012

Filed:

Dec 23, 2009

Appl. No.:

12/646558

Inventors:

Radhakrishnan L. Nagarajan - Cupertino CA, US
Andrew G. Dentai - Mountain View CA, US
Scott Corzine - Sunnyvale CA, US
Steven Nguyen - San Jose CA, US
Vikrant Lal - Sunnyvale CA, US
Jacco L. Pleumeekers - Mountain View CA, US
Peter W. Evans - Mountain House CA, US

Assignee:

Infinera Corporation - Sunnyvale CA

International Classification:

H01L 31/0232

US Classification:

257432, 257189, 257E31056

Abstract:

Consistent with the present disclosure, a current blocking layer is provided between output waveguides carrying light to be sensed by the photodiodes in a balanced photodetector, and the photodiodes themselves. Preferably, the photodiodes are provided above the waveguides and sense light through evanescently coupling with the waveguides. In addition, the current blocking layer may include alternating p and n-type conductivity layers, such that, between adjacent ones of such layers, a reverse biased pn-junction is formed. The pn-junctions, therefore, limit the amount of current flowing from one photodiode of the balanced detector to the other, thereby improving performance.