Optical: systems and elements – Deflection using a moving element – Using a periodically moving element
Patent
1994-05-09
1995-07-25
Moore, David K.
Optical: systems and elements
Deflection using a moving element
Using a periodically moving element
359110, 359160, 359179, 359341, 372 6, H04B 1002, H04B 1000
Patent
active
054367506
ABSTRACT:
In an optical repeatered transmission system, an optical multiplex of a data signal and a supervisory signal is sent from a first terminal station. At an upstream repeater station, the optical signal is received and combined with excitation light energy supplied from a laser and amplified by an erbium-doped fiber with the excitation energy for transmission to a downstream repeater station. At the downstream repeater station, the optical signal is combined with excitation light energy supplied from a laser and amplified by an erbium-doped fiber with the excitation energy for transmission to a second terminal station. At the upstream repeater station, the supervisory signal is monitored. If it is determined to be lost, the excitation light energy of the station is modulated with a first fault-point indicating signal which is unique to the upstream repeater station and transmitted to the downstream repeater station instead of the optical multiplex signal. At the downstream repeater station, the supervisory signal and the first fault-point indicating signal are monitored. If both of these signals are determined to be lost, the excitation energy of the station is modulated with a second fault-point indicating signal that is unique to the downstream repeater station and transmitted to the second terminal station. If the supervisory signal and any of the fault-point indicating signals are not detected, an alarm is given indicating that a failure has occurred between the second terminal station and the downstream repeater station. If one of the fault-point indicating signals is detected, an alarm will be given indicating that a failure has occurred at a point identified by the detected fault-point indicating signal.
REFERENCES:
patent: 5260819 (1993-11-01), Hadjifotiou et al.
patent: 5268786 (1993-12-01), Matsushita et al.
patent: 5299048 (1994-03-01), Suyama
Moore David K.
NEC Corporation
Negash Kinfe-Michael
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