Optics: measuring and testing – By particle light scattering – With photocell detection
Patent
1999-02-22
2000-08-15
Kim, Robert H.
Optics: measuring and testing
By particle light scattering
With photocell detection
356352, G01B 902
Patent
active
06104492&
ABSTRACT:
In accordance with the present invention, apparatus for and method of operating an optical signal monitor is disclosed for providing rapid monitoring of optical signals using a high speed optical modulator. One illustrative optical signal monitor includes (1) a Mechanical AntiReflective Switch (MARS) optical modulator (signal chopper) capable of operating at 10 MHz rates and having a detection bandwidth greater than 100 kHz and (2) a synchronous detector using lock-in detection in a 1550 nm-band WDM optical monitor to enhance detection sensitivity by greater than 30 dB compared to direction detection methods. According to another embodiment, the optical monitor can be used to control adaptive optical amplifier units or equalizer units of a wavelength division multiplexed (WDM) system.
REFERENCES:
patent: 5982488 (1999-11-01), Shirasaki
Giles Randy Clinton
Stulz Lawrence Warren
Walker James Albert
Kim Robert H.
Lee Andrew H.
Lucent Technologies Inc
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