Optical waveguides – With optical coupler – Plural
Patent
1997-12-12
1999-12-28
Lee, John D.
Optical waveguides
With optical coupler
Plural
359110, 385 37, G02B 628, H04B 1008
Patent
active
060092203
ABSTRACT:
A surveillance system for in-service fault identification in an amplified passive branched optical network is provided. This system does not require any wavelength tunable light source as used in multi-wavelength OTDR. Fiber-Bragg gratings are placed at some strategic positions on different fiber branches to slice and reflect the optical amplifier's residual ASE power at some wavelength other than the signal wavelengths. The conditions of the fiber link and optical amplifier at each branch can be monitored by constantly checking the reflected power level of the corresponding wavelength without suspending the in-service channels.
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Chan Chun-Kit
Chen Lian-Kuan
Lam Dennis K. W.
Tong Frank F. K.
Kang Juliana K.
Lacasse Randy W.
Lee John D.
Strickland Wesley L.
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