Optical repeater having loop-back function used in transmission

Details Optical repeater having loop-back function used in transmission Optical repeater having loop-back function used in transmission

1991-09-13

1994-03-22

Woodiel, Donald

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359174, 359166, H04B 1002, H04B 1000

Patent

active

052969576

ABSTRACT:
An optical repeater having a loop-back function is provided in a transmission system including first and second transmission lines. The optical repeater includes a first optical amplifier connected to the first transmission line, a second optical amplifier connected to the second transmission line, a loop-back unit connected to both transmission lines, and a control unit. The control unit controls the loop-back unit to form a loop-back line when a loop-back instruction is detected. Therefore, optical signals are directly amplified without being converted into electrical signals, and a loop-back signal (return signal) and optical signals are not mixed in the optical repeater so that a loop-back operation can be correctly carried out in an optical repeater having a small size and low power consumption.

REFERENCES:
patent: 5050949 (1991-09-01), DiGiovanni et al.
patent: 5054876 (1991-10-01), Grasso et al.
patent: 5083874 (1992-01-01), Aida et al.

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