Level-setting optical attenuator

Details Level-setting optical attenuator Level-setting optical attenuator

1997-08-22

1999-05-04

Dang, Hung Xuan

Optical: systems and elements

Single channel simultaneously to or from plural channels

By surface composed of lenticular elements

385140, 359663, G02B 2710, G02B 600, G02B 1322

Patent

active

059009837

ABSTRACT:
A level-setting attenuator for generating an output signal having a predetermined optical power from an input optical signal having a varying power is disclosed. The level-setting attenuator includes a telecentric imaging device, a variable atttenuator, an optical power detector and control electronics. The telecentric imaging device collimates a received optical signal which is received and partially attenuated by the variable attenuator. In some embodiments, the variable attenuator generates an attenuated signal portion and an unattenuated signal portion. The attenuated signal is directed, by the variable attenuator, to an optical power detector operable to measure the power of the attenuated optical signal. The detector sends a signal indicative of the measurement to control electronics. The control electronics are operable to generate a control signal for controlling the attenuation of the unattenuated signal portion so that is has the predetermined power level. The unattenuated signal portion is coupled, via the telecentric imaging device, into an output fiber.

REFERENCES:
patent: 5745634 (1998-04-01), Garrett et al.

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