Kevin Y Tseng

US Patent:

6600594, Jul 29, 2003

Filed:

Feb 21, 2002

Appl. No.:

10/081765

Inventors:

Jimmy Ko - San Leandro CA
Kevin Tseng - San Leandro CA

Assignee:

Lightech Fiberoptics, Inc. - San Leandro CA

International Classification:

H01S 300

US Classification:

359337, 35933713, 359161

Abstract:

A variable optical attenuation system has at least one variable optical attenuation device that receives a light signal, attenuates the light signal, and transmits an attenuated light signal. The variable optical attenuator system further has a controller circuit in communication with the variable optical attenuation device to provide an attenuation control signal to the variable optical attenuation device to cause the variable optical attenuation device to adjust an attenuation factor of the variable optical attenuation device. The variable optical attenuator system also has a data retaining device such as an EEPROM in communication with the controller circuit. The data retaining device has a listing of attenuation factors and corresponding attenuation control signals. A communication interface such as a serial data link, within the variable optical attenuator system provides communication between the controller circuit and an external command system. The external command system indicates a desired attenuation factor and the control circuit accesses the data retaining device to retrieve the corresponding attenuation control signal.