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Darin Douma Phones & Addresses

  • 16 Jessie St APT 113, San Francisco, CA 94105
  • Sioux Falls, SD
  • Sunnyvale, CA
  • 41 Hidden Valley Rd, Monrovia, CA 91016 (626) 239-0206
  • Santa Clara, CA
  • Warrenton, VA
  • Pasadena, CA
  • 41 Hidden Valley Rd, Monrovia, CA 91016

Publications

Us Patents

Method And Apparatus For Monitoring A Photo-Detector

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US Patent:
6888123, May 3, 2005
Filed:
May 9, 2003
Appl. No.:
10/435119
Inventors:
Darin James Douma - Monrovia CA, US
Stephan C. Burdick - Cupertino CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H01J040/14
US Classification:
250214R, 2502141
Abstract:
An optical signal detector monitoring circuit can include a current divider current mirror (CDCM) and a current multiplier current mirror (CMCM). A mirror leg of the CDCM generates a current corresponding with a part of the CDCM's primary leg current. The CMCM's primary leg couples to the CDCM's mirror leg. The CMCM generates a mirror leg current corresponding with a multiple of its primary leg current. Another circuit can include a first current mirror having a primary current leg (PCL), coupled between an optical signal detector and one of an electrical source and an electrical sink, that exhibits a resistance corresponding with a part of the resistance of the first current mirror's mirror current leg (MCL). The circuit's second current mirror has a MCL that exhibits a resistance corresnonding with a part of the resistance of the second current mirror's PCL, which couples with the first current mirror's MCL.

Optical Transceiver Module With Multipurpose Internal Serial Bus

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US Patent:
6912361, Jun 28, 2005
Filed:
Oct 8, 2002
Appl. No.:
10/266870
Inventors:
Lewis B. Aronson - Los Altos CA, US
Lucy G. Hosking - Santa Cruz CA, US
Greta L. Light - San Mateo CA, US
Darin James Douma - Monrovia CA, US
Mark J. Farley - Napa CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H04V010/00
US Classification:
398135, 398137
Abstract:
The optical transceiver module includes an optical transmitter and an optical receiver. The optical transceiver module also includes an internal serial bus and a plurality of addressable components electrically coupled to the internal serial bus. Each of the addressable components included a serial interface for communicating with the internal serial bus, and a memory. Each addressable component also includes a unique address or chip select logic coupled to a controller via a chip select line. This allows data to be addressed to specific addressable components. The addressable components may include a laser driver, a laser bias controller, a power controller, a pre-amplifier, a post-amplifier, a laser wavelength controller, a main controller, a electrothermal cooler, an analog-to-digital converter, a digital-to analog converter, an APD bias controller, or any combination of the aforementioned components.

Method And Apparatus For Monitoring A Photo-Detector In An Optical Transceiver

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US Patent:
6930300, Aug 16, 2005
Filed:
Jul 30, 2002
Appl. No.:
10/209452
Inventors:
Darin James Douma - Monrovia CA, US
Philip D. Shapiro - Palo Alto CA, US
Linda Xiaorong Liu - San Jose CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H01J040/14
US Classification:
250214A, 250214 R
Abstract:
The method and apparatus for monitoring a photo-detector generates a highly compliant mirror current across a broad range of photo-detector current levels. The apparatus for monitoring includes: a pair of bipolar transistors and a first non-linear isolation element. The pair of transistors are connected in a mirror configuration with a sense transistor one of the pair of transistors sensing a photo-detector current and with a mirror transistor one of the pair of transistors mirroring the photo-detector current with a mirror current. The first non-linear isolation element has at least two terminals a first of which couples to the collector of the mirror transistor. The first non-linear isolation element exhibits a non-linear voltage drop between the at least two terminals in response to varying levels of the mirror current to improve compliance between the mirror current and the detector current. Methods and means for monitoring a photo-detector are also disclosed.

Controlling The Dynamic Range Of An Avalanche Photodiode

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US Patent:
7087882, Aug 8, 2006
Filed:
Oct 31, 2003
Appl. No.:
10/698558
Inventors:
J. Christopher Dries - Skillman NJ, US
Darin J. Douma - Monrovia CA, US
Rudolf J. Hofmeister - Sunnyvale CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H01L 31/00
US Classification:
250214, 250214 R
Abstract:
An avalanche photodiode with a wide dynamic range. An avalanche photodiode with a wide dynamic range is used in fiber-optic communication applications where optical signals of varying powers may be received. The avalanche photodiode includes a field control layer. A doping thickness product can be configured to determine a dynamic range of the avalanche photodiode. The gain of the avalanche photodiode is controllable by adjusting a bias voltage across the avalanche photodiode.

Optical Transceiver Module Having A Dual Segment Molded Lead Frame Connector

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US Patent:
7144259, Dec 5, 2006
Filed:
Sep 26, 2005
Appl. No.:
11/236123
Inventors:
Donald A. Ice - Milpitas CA, US
Stephen T. Nelson - Cupertino CA, US
Darin J. Douma - Monrovia CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
H05K 1/00
US Classification:
439 79, 439516, 439736, 385 92, 385 93, 385 89
Abstract:
An optical transceiver module having a plurality of optical subassemblies and a printed circuit board is disclosed. The transceiver module includes lead frame connectors for connecting the optical subassemblies to the printed circuit board. The lead frame connectors include a stamped and bent conductive lead structure that is encased in an insert injection molded plastic casing. The plastic casing provides electrical insulation for the conductors in the lead frame as well as mechanical support for the finished component. The lead frame connectors connect to the leads associated with the optical subassemblies and are surface mounted onto the printed circuit board to establish connectivity between the optical subassembly and the printed circuit board. The lead frame assemblies are generally more reliable and less expensive than using flexible printed circuit board structures to establish electrical connectivity between optical subassemblies and transceiver printed circuit boards.

Avalanche Photodiode Controller Circuit For Fiber Optics Transceiver

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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.

Interconnect Mechanism For Connecting A Laser Driver To A Laser

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US Patent:
7181100, Feb 20, 2007
Filed:
Mar 8, 2006
Appl. No.:
11/370311
Inventors:
Darin James Douma - Monrovia CA, US
Assignee:
Finisar Corporation - Sunnyvale CA
International Classification:
G02B 6/12
US Classification:
385 14, 398135, 398137
Abstract:
A transmission mechanism for transmitting an electrical signal from the output stage of an electro-optic transducer driver to an electro-optic transducer. The transmission mechanism includes the electro-optic transducer, the electro-optic transducer driver and a termination resistor. A first node of the termination resistor is coupled to the first differential input terminal of the electro-optic transducer. A second node of the termination resistor is coupled to the first output node of the electro-optic transducer driver. In addition, a second differential input terminal of the electro-optic transducer is coupled to a second output node of the electro-optic transducer driver. Such connections provide for a first DC path from the first differential input terminal of the electro-optic transducer to the second electro-optic transducer driver output node and a second DC path from the first node of the termination resistor to first electro-optic transducer driver output node.

Method For Calibrating An Optoelectronic Device Based On Apd Breakdown Voltage

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US Patent:
7217914, May 15, 2007
Filed:
Jul 27, 2004
Appl. No.:
10/899904
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:
H01J 40/14
H01L 35/00
H02H 5/04
US Classification:
250214R, 327513, 361 938
Abstract:
Methods and processes are disclosed for calibrating optoelectronic devices, such as optoelectronic transceivers and optoelectronic receivers, based upon an avalanche photodiode breakdown voltage. In general, the method involves adjusting a reverse-bias voltage of the avalanche photodiode until avalanche breakdown of the avalanche photodiode occurs. An optimized APD reverse-bias voltage is then determined by reducing the reverse-bias voltage at which avalanche breakdown occurs by a predetermined offset voltage. This process is performed at a variety of different temperatures. Information concerning each temperature and the corresponding optimized APD reverse-bias voltage is stored in a memory of the optoelectronic device.
Darin James Douma from San Francisco, CA, age ~59 Get Report