Optical method and system for measuring in-band crosstalk in...

Details Optical method and system for measuring in-band crosstalk in... Optical method and system for measuring in-band crosstalk in...

2005-10-25

2005-10-25

Gregory, Bernarr E. (Department: 3663)

Optical communications

Diagnostic testing

Determination of communication parameter

Reexamination Certificate

active

06959150

ABSTRACT:
A method for measuring in-band crosstalk in an optical amplifier, such as a Raman amplifier, in which a modulated optical signal is generated using an input modulator. The modulated optical signal is passed through the optical amplifier to obtain a first output optical signal, the power level of which is measured when the input modulator is in its off-state. The modulated optical signal is then attenuated by a factor equal to the extinction ratio of the input modulator to obtain an attenuated modulated optical signal which is passed through the optical amplifier to obtain a second output optical signal. The power level of the second output optical signal is measured when the input modulator is in its on-state. The in-band crosstalk is calculated by subtracting the power level of the second output optical signal from the power level of the first output optical signal.

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Staubli et al. Power Penalties Due to Multiple Rayleigh Backscattering in Coherent Transmission Systems Using In-Line Optical Amplifiers. IEEE Photonics Technology Letters. vol. 2. No. 12. Dec. 1990. pp. 872-874.
Lewis, Chernikov, and Taylor, “Characterization of Double Rayleigh Scatter Noise in Raman Amplifiers,” IEEE Photonic Technology Letters, vol. 12, No. 5, May 2000, pp. 528-530.

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