Anthony S Ho

US Patent:

6452922, Sep 17, 2002

Filed:

Dec 23, 1998

Appl. No.:

09/219018

Inventors:

Anthony Ho - Fremont CA

Assignee:

Nortel Networks Limited - St. Laurent

International Classification:

H04L 1266

US Classification:

370352, 370237

Abstract:

An apparatus causes alternate connection of a telephone call directed to an IP network if the quality of service provided by the IP network is less than a predetermined threshold. A network monitor measures a transmission rating factor for the IP network. An IP network interface, coupled to the network monitor, an originating system, and the IP network, receives the telephone call for a dialed number from the originating system. The IP network interface causes the originating system to connect the telephone call through a first network if the measured transmission rating factor for the IP network is less than the desired transmission rating factor, and connects the telephone call through the IP network otherwise.

US Patent:

6852966, Feb 8, 2005

Filed:

Oct 30, 2002

Appl. No.:

10/285264

Inventors:

Darin James Douma - Monrovia CA, US
James Walter Stewart - San Jose CA, US
Rudy Hofmeister - Sunnyvale CA, US
Anthony W. Ho - Sunnyvale CA, US
Lucy G. Hosking - Santa Cruz CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01J040/14

US Classification:

250214AG, 250214 C, 327514

Abstract:

The method and apparatus for compensating a photo-detector allows both regulation and monitoring of the photo-detector to be performed with a common digital controller. The controller accepts input of monitored operational parameters including received signal strength and temperature. The controller provides as an output a bias control signal which regulates a positive the positive or negative side bias voltage power supply for the photo-detector. The controller maintains the bias voltage to the photo-detector at levels which optimize the gain and signal-to-noise ratios for the photo-detector thereby facilitating the decoding of the received signal over a broad range of signal strengths and temperatures. The controller includes a corresponding digital signal strength and temperature compensators the outputs of which summed with a summer to provide the bias control signal. The digital signal strength compensator also provides as an output a monitor signal a level of which corresponds to the actual signal strength received by the photo-detector after compensation for the variable gain of the photo-detector resulting from the bias voltage level.

US Patent:

6862302, Mar 1, 2005

Filed:

Oct 31, 2002

Appl. No.:

10/285105

Inventors:

Yew-Tai Chieng - Singapore, SG
Anthony Ho - Richmond CA, US
John Hsieh - Cupertino CA, US
Chun Lei - Arcadia CA, US
Jan Lipson - Cupertino CA, US
Jeff Price - Merrillville IN, US
Andreas Weber - Los Altos CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S003/13

US Classification:

372 2902, 372 29015, 372 25, 372 3807, 359152, 359180

Abstract:

A method of maintaining desirable optical performance of optical emitters over temperature variations is disclosed. The optical performance of an optical emitter in terms of power, extinction ratio, jitter, mask margin and general fiber optic transmitter eye quality can be maintained by the present invention over a wide range of temperatures. Advantageously, the present invention enables the use of inexpensive optical emitters in optoelectronic transceivers and optoelectronic transmitters.

US Patent:

7035300, Apr 25, 2006

Filed:

Nov 4, 2003

Appl. No.:

10/700845

Inventors:

James Stewart - San Jose CA, US
Lucy G. Hosking - Santa Cruz CA, US
Anthony Ho - Richmond CA, US
Andreas Weber - Los Altos CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S 3/04

US Classification:

372 34, 372 36

Abstract:

A method for calibrating a multi-channel laser emitter in an optoelectronic transceiver or an optoelectronic transmitter for a first wavelength includes monitoring the wavelength of optical signals from the laser emitter while varying its temperature as well as other operating conditions, and then storing calibration information in the memory of a microprocessor. The initial values of the calibrating procedure are reset and the calibrating procedure is repeated to obtain calibration information for a next desired wavelength.

US Patent:

7039082, May 2, 2006

Filed:

Dec 2, 2003

Appl. No.:

10/725871

Inventors:

James Stewart - Burlingame CA, US
Lucy G. Hosking - Santa Cruz CA, US
Anthony Ho - Sunnyvale CA, US
Andreas Weber - Los Altos CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S 3/04

US Classification:

372 34, 372 36

Abstract:

A method for calibrating a multi-channel laser emitter in an optoelectronic transceiver or an optoelectronic transmitter for a first wavelength includes monitoring the wavelength of optical signals from the laser emitter while varying its temperature as well as other operating conditions, and then storing calibration information in the memory of a microprocessor. The initial values of the calibrating procedure are reset and the calibrating procedure is repeated to obtain calibration information for a next desired wavelength.

US Patent:

7058099, Jun 6, 2006

Filed:

Nov 4, 2003

Appl. No.:

10/700981

Inventors:

James Stewart - San Jose CA, US
Lucy G. Hosking - Santa Cruz CA, US
Anthony Ho - Richmond CA, US
Andreas Weber - Los Altos CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H01S 3/13
H01S 3/98

US Classification:

372 32, 372 18

Abstract:

A method for compensating for wavelength drift in a fiber-optic laser transmitter includes 1) controlling a temperature within the optoelectronic assembly at a defined level; 2) driving the optoelectronic assembly to emit light, wherein the emitted light has a wavelength that is within a channel of operation, the channel of operation including a range of wavelengths centered around a channel center wavelength; 3) accessing from memory within the optoelectronic assembly a control value associated with the temperature of the optoelectronic assembly at defined points within an operational lifetime of the optoelectronic assembly; and 4) recalculating the defined level by reference to the control value, whereby a wavelength of the optoelectronic assembly is maintained within the channel of operation despite an expected drift of wavelength.

US Patent:

7149430, Dec 12, 2006

Filed:

Jul 8, 2003

Appl. No.:

10/616362

Inventors:

Lucy G. Hosking - Santa Cruz CA, US
James Stewart - San Jose CA, US
Anthony Ho - Sunnyvale CA, US

Assignee:

Finsiar Corporation - Sunnyvale CA

International Classification:

H04B 10/00

US Classification:

398137, 398195

Abstract:

The optoelectronic transceiver includes first and second controller ICs. Each controller IC includes logic, a memory, an interface, and at least one input port. Each memory is configured to store digital diagnostic data and has a unique serial device address to allow a host access to each of these controller ICs separately and independently. At least some of the digital diagnostic data is common to both the first controller IC and the second controller IC. The inclusion of two controller ICs allows the same diagnostic data to be stored in completely different memory mapped locations. This allows hosts that are preconfigured differently to read different memory mapped locations on the different controller ICs to obtain the same diagnostic data.

US Patent:

7155133, Dec 26, 2006

Filed:

Mar 18, 2002

Appl. No.:

10/101258

Inventors:

James Stewart - San Jose CA, US
Anthony Ho - Sunnyvale CA, US
Rudolf J. Hofmeister - Sunnyvale CA, US
Darin James Douma - Monrovia CA, US
Lucy G. Hosking - Santa Cruz CA, US
Andreas Weber - Los Altos CA, US
Jeffrey Bryant Price - Sunnyvale CA, US

Assignee:

Finisar Corporation - Sunnyvale CA

International Classification:

H04B 10/06

US Classification:

398202, 250214 R, 250214 SW

Abstract:

A controller for controlling the reverse-bias voltage of an avalanche photodiode in a transceiver or receiver. The controller includes memory for storing information related to the avalanche photodiode, and analog to digital conversion circuitry for receiving an analog signal corresponding to the temperature of the avalanche photodiode, converting the received analog signal into a digital value, and storing the digital value in a predefined location within the memory. Control circuitry in the controller controls the operation of the avalanche photodiode and a temperature lookup table store in the memory. A serial interface enables a host device to read from and write to locations within the memory. The invention also controls the reverse-bias voltage of an avalanche photodiode in a transceiver or receiver.