H - Electricity – 04 – B
Patent
H - Electricity
04
B
325/1
H04B 10/12 (2006.01) H04B 10/16 (2006.01) H04B 10/17 (2006.01) H04B 10/213 (2006.01)
Patent
CA 2014551
ABSTRACT OF THE DISCLOSURE In optical branching equipment which is supplied with an optical signal of a first wavelength band from a trunk line terminal equipment via a trunk line cable and is inserted in the trunk line, the optical signal is normally provided to the trunk line cable after being bypassed from a branching circuit to branch line terminal equipment connected to a branch line cable, and when trouble develops in the branch line, the optical signal is delivered to the trunk line cable via a short circuit. In the short circuit there is inserted an optical limiter amplifier which is capable of amplifying light of the first and second wavelength bands. Normally the optical limiter amplifier is saturated by control light of the second wavelength supplied from the branch line terminal equipment via the branch line cable, and consequently, the optical signal of the first wavelength band is suppressed. When the supply of the control light is stopped by some cause, the optical limiter amplifier amplifies the optical signal of the wavelength band provided to the short circuit and provides the amplified optical signal to the trunk line cable.
Aida Kazuo
Nakagawa Kiyoshi
Nishi Shigendo
Kirby Eades Gale Baker
Nippon Telegraph & Telephone Corporation
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