Optical waveguides – With optical coupler – Plural
Patent
1996-09-25
1998-07-07
Ngo, John
Optical waveguides
With optical coupler
Plural
359134, 359160, 385147, 372 6, G02B 628
Patent
active
057781176
ABSTRACT:
A device is used for receiving input signal light and pump light from a first remote site through a first optical fiber and a second optical fiber, respectively, and for sending amplified signal light through a third optical fiber to a second remote site. The device includes an amplifier unit for amplifying the input signal light by using the pump light to transmit the amplified signal light to the third optical fiber, the amplifier unit having a prevention unit for preventing light coming back through the third optical fiber from entering the amplifier unit, and a path providing unit for providing a path inside the device, the path leading reflection light coming through the third optical fiber to a connection point of the device, the connection point having optical connection with the first remote site, wherein the reflection light is a light pulse for fault localization reflected at a fault point on the third optical fiber, the light pulse for fault localization sent to the third optical fiber from the first remote site via the device.
REFERENCES:
patent: 5185826 (1993-02-01), Delavaux
patent: 5214728 (1993-05-01), Shigematsu et al.
patent: 5542011 (1996-07-01), Robinson
patent: 5555118 (1996-09-01), Huber
patent: 5572612 (1996-11-01), Delavaux et al.
patent: 5598491 (1997-01-01), Ohya et al.
Inoue Yoshiyuki
Miyazaki Takashi
Fujitsu Limited
Ngo John
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