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Simultaneous channel and OSNR monitoring using a polarization-selective modulator and an LED

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4 Author(s)
Chun-Liang Yang ; Nat. Taiwan Univ. of Sci. & Technol., Taipei, Taiwan ; San-Liang Lee ; Hen-Wai Tsao ; Jingshown Wu

A compact module including a polarization-selective electrooptic modulator and a light-emitting diode (LED) sensor is utilized for optical signal-to-noise-ratio (OSNR) monitoring and channel recognition. The modulator acts as a polarizer and provides signal dithering to improve the detection sensitivity, while the LED is used as a channel sensor. The channel sensor can monitor a wide wavelength range that is rapidly adjustable and can have much relaxed tolerance on temperature control. The combination of a polarization controller/rotator and the polarized modulator can accurately measure the OSNR between 5 and 35 dB with an error less than 0.5 dB.

Published in:

Photonics Technology Letters, IEEE  (Volume:16 ,  Issue: 3 )

Date of Publication:

March 2004

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