Gain profile measuring method and system and gain profile...

Details Gain profile measuring method and system and gain profile... Gain profile measuring method and system and gain profile...

2006-03-07

2006-03-07

Nguyen, Tu T. (Department: 2877)

Optics: measuring and testing

For optical fiber or waveguide inspection

Reexamination Certificate

active

07009693

ABSTRACT:
To control a gain profile in an optical fiber line to become a desirable form, a C-OTDR measuring apparatus (36) outputs a probe pulse light having a wavelength λm for an optical fiber line (14). A power level on the input or output side of a variable gain equalizer (22) can be measured according to a C-OTDR waveform of a return light of the probe pulse light entered through a C-OTDR path (20c) and an optical fiber line (16). By sweeping the measurement wavelength λm, the gain file is measured. The equalizing characteristics of the variable gain equalizer (22) are remotely controlled so that the gain profile becomes a desirable form according to the measured result.

REFERENCES:
patent: 6414775 (2002-07-01), Pedersen
patent: 6864968 (2005-03-01), Mori et al.
Kawazawa, et al., “Novel Gain Tilt Monitoring Method for DWDM Submarine Cable Systems”, OAA 2001, OMD3-1—OMD3-3.
Naito, et al., “Active Gain Slope Compensating in Large-Capacity, Long-Haul WDM Transmission System”, OAA'99, WC5, pp. 36-39.
Takeda, et al., “Active gain equalization for transoceanic WDM transmission systems”, OFC99, WM43-1, pp. 322-324.

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