Jingcheng Zhang from Rancho Santa Margarita, CA

High Efficiency Thermoelectric Cooler Control System
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US Patent:

8051665, Nov 8, 2011
Filed:

Dec 12, 2007
Appl. No.:

11/955292
Inventors:

Ziv Lipkin - Cupertino CA, US
Jingcheng Zhang - Saratoga CA, US
Assignee:

Finisar Corporation - Sunnyvale CA
International Classification:

F25B 21/02
US Classification:

62 37, 62 32
Abstract:

A temperature control system is provided for efficiently controlling the temperature of an optical transmitter such as a laser diode. The temperature control system of the present invention reduces power consumption and achieves a higher efficiency by employing a voltage controller and a high-efficiency DC-DC step-down converter between the TEC controller, which drives the thermoelectric cooler, and the microcontroller, which governs the optical transmitter operation. The voltage controller converts an analog voltage command signal into a current-based command signal, which is then sent to the DC-DC step-down converter. The DC-DC converter produces a stepped-down voltage which it supplies to the TEC controller. The TEC controller receives the stepped-down voltage input from the DC-DC converter and outputs a corresponding current signal to the thermoelectric cooler. Because the current signal output by the TEC controller is proportional to the voltage signal it receives from the DC-DC converter, the current signal is reduced in magnitude.

Temperature Measurement Apparatus For Optoelectronic Transceiver
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US Patent:

8128283, Mar 6, 2012
Filed:

Sep 29, 2008
Appl. No.:

12/240930
Inventors:

Lucy G. Hosking - Santa Cruz CA, US
Ricardo Enrique Saad - Plano TX, US
Jingcheng Zhang - Saratoga CA, US
Jiashu Chen - Santa Clara CA, US
Donald A. Ice - Milpitas CA, US
Assignee:

Finisar Corporation - Sunnyvale CA
International Classification:

G01K 1/00
US Classification:

374208
Abstract:

The case temperature measurement device for an optoelectronic transceiver includes a case with at least one thermally conductive wall, at least one optical component at least partially disposed within the case, circuitry electrically coupled to the optical component. The circuitry includes a temperature sensor coupled to the circuitry. The case temperature measurement device also includes at least one protrusion formed on the wall of the case of the optoelectronic transceiver. The protrusion is thermally coupled to temperature sensor via a thermal pad. A method for estimating case temperature of the optoelectronic transceiver based on an internal temperature measurement and knowledge of the relationship between the measured internal temperature and the actual case temperature, and compensating for the effects of variable heat sources within the transceiver upon this estimate.

Communications Device With Integrated Case Temperature Measurement
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US Patent:

8251582, Aug 28, 2012
Filed:

Feb 6, 2012
Appl. No.:

13/367280
Inventors:

Lucy G. Hosking - Santa Cruz CA, US
Ricardo Enrique Saad - Plano TX, US
Jingcheng Zhang - Saratoga CA, US
Jiashu Chen - Santa Barbara CA, US
Donald A. Ice - Milpitas CA, US
Assignee:

Finisar Corporation - Sunnyvale CA
International Classification:

G01K 1/00
US Classification:

374208
Abstract:

A communications device with integrated case temperature measurement includes a case having at least one thermally conductive wall and a circuit board at least partially disposed within the case. At least one electronic component is mounted on the circuit board and a temperature sensor is mounted on the circuit board. At least one thermally conductive protrusion extends from the wall and is thermally coupled to the temperature sensor.

Fiberoptic Transmitter Using Thermistor To Maintain Stable Operating Conditions Over A Range Of Temperature
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US Patent:

60552522, Apr 25, 2000
Filed:

Sep 10, 1998
Appl. No.:

9/151056
Inventors:

Jingcheng Zhang - San Jose CA
Assignee:

Photonic Solutions, Inc. - San Jose CA
International Classification:

H01S 304
US Classification:

372 34
Abstract:

Techniques for controlling the operation of a laser diode to maintain optimum operating characteristics (i. e. , fairly constant output power and extinction ratio) despite the fact that the threshold current and slope efficiency vary greatly over a the desired range of operating temperature. A laser driving circuit includes a bias current generator, a temperature-dependent modulation current generator, and a switching element for switching the modulation current on and off in accordance with a desired input pattern. The modulation current is caused to vary with temperature in a manner that compensates for the fact that the laser diode's slope efficiency varies with temperature.