Apparatus and method for monitoring optical signal

Details Apparatus and method for monitoring optical signal Apparatus and method for monitoring optical signal

2006-10-17

2006-10-17

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

07123352

ABSTRACT:
An apparatus and method for monitoring an optical signal are provided. In the apparatus, a polarization adjusting unit converts the state of polarization of an optical signal. A polarization beam splitter splits the optical signal into a first polarization component and a second polarization component perpendicular to each other. An optical intensity measuring unit measures the optical intensity of the first polarization component. A feedback control unit controls the polarization adjusting unit so that the first and second polarization components are aligned to the two axes of the polarization beam splitter. A scrambler scrambles the optical signal input to the transmission optical fiber. According to the apparatus and method, optical signal-to-noise ratio (OSNR) can be measured accurately.

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“OSNR Monitoring Technique Using Polarization-Nulling Method”, J. Lee, et al., IEEE Photonics Technology Letters, vol. 13, No. 1, Jan. 2001, pp. 88-90.

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