ANTHONY K HO, P.T.
Physical Therapy at Kearney St, Richmond, CA
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Physical Therapist
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Professional information
Age Compensation In Optoelectronic Modules With Integrated Temperature Control
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
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.
Maintaining Desirable Performance Of Optical Emitters Over Temperature Variations
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
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.
Systems, Devices And Methods For Temperature-Based Control Of Laser Performance
US Patent:
7386020, Jun 10, 2008
Filed:
Dec 22, 2004
Appl. No.:
11/022363
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
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:
H01S 3/13
US Classification:
372 2902, 372 29015, 372 3801
Abstract:
This disclosure concerns systems, methods and devices for temperature-based control of laser performance. One example of a method is performed in connection with a laser of an optoelectronic transceiver. In particular, the laser is operated over a range of temperatures and the optical output of the laser is monitored. During operation of the laser, the bias current and current swing supplied to the laser are adjusted to the extent necessary to maintain a substantially constant optical output from the laser over the range of temperatures.
Calibration Of A Multi-Channel Optoelectronic Module With Integrated Temperature Control
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
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.
Control Circuit For Optoelectronic Module With Integrated Temperature Control
US Patent:
7269191, Sep 11, 2007
Filed:
Mar 18, 2002
Appl. No.:
10/101248
Inventors:
James Stewart - San Jose CA, US
Anthony Ho - Richmond CA, US
Andreas Weber - Los Altos CA, US
Lucy G. Hosking - Santa Cruz CA, US
Anthony Ho - Richmond CA, US
Andreas Weber - Los Altos CA, US
Lucy G. Hosking - Santa Cruz CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H01S 3/04
US Classification:
372 34, 372 3802
Abstract:
A microprocessor is used to control the temperature of a laser emitter and thereby regulate the wavelength of optical signals from the laser. A serial interface in the microprocessor provides input and output lines to a host device, and temperature lookup tables are stored in nonvolatile memory. Control logic processes information stored in the memory as well as information on operating conditions of the laser emitter to precisely control the temperature of the laser emitter. A thermo-electric cooler adjusts the temperature of the laser emitter.
Method For Calibrating An Optoelectronic Device Using Apd Bit Error Rate
US Patent:
2005000, Jan 6, 2005
Filed:
Jul 27, 2004
Appl. No.:
10/899941
Inventors:
James Stewart - San Jose CA, US
Anthony Ho - Richmond CA, US
Rudolf Hofmeister - Sunnyvale CA, US
Darin Douma - Monrovia CA, US
Stephen Hosking - Santa Cruz CA, US
Andreas Weber - Los Altos CA, US
Jeffrey Price - Sunnyvale CA, US
Anthony Ho - Richmond CA, US
Rudolf Hofmeister - Sunnyvale CA, US
Darin Douma - Monrovia CA, US
Stephen Hosking - Santa Cruz CA, US
Andreas Weber - Los Altos CA, US
Jeffrey Price - Sunnyvale CA, US
International Classification:
H01J040/14
US Classification:
25021400R
Abstract:
Methods and processes are disclosed for calibrating optoelectronic devices, such as optoelectronic transceivers and optoelectronic receivers, based upon a measured avalanche photodiode bit error rate. In general, the method involves measuring a bit error rate for the avalanche photodiode and adjusting the reverse bias voltage of the avalanche photodiode until the bit error rate is minimized. This process is repeated for each of a variety of different thermal conditions. Information concerning each thermal condition and the corresponding reverse bias voltage is stored in a memory of the optoelectronic device.