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| Two plate-like beam splitting device |
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| Method and apparatus for receiving symbols |
| We claim: 1. An apparatus for receiving symbols comprising: a symbol source for providing a ... |
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| Fault management in a multichannel transmission system |
| The present invention describes methods for rerouting channels on failed line cards to spare line ... |
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| Maintenance of optical networks |
| FIG. 1 shows one embodiment of the present invention in which an identifier tone is added to an ... |
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| Dual rate, burst mode, radiation hardened, optical transceiver |
| In accordance with this invention, a transceiver for recovering one (1) MBit and twenty (20) MBit ... |
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| Fault detection for all-optical add-drop multiplexer |
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| M input port by N output port optical switching system |
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| Signal detection circuit using a plurality of delay stages with edge detection logic |
| What is claimed is: 1. A circuit for detecting a digital signal, comprising: a plurality of delay ... |
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Remote control system of an optical repeater
| Details |
Inventors: Seki, Norio; Yatsuzuka, Yohtaro; Sakaguchi, Haruo;
Assignee: Kokusai Denshin Denwa Co., Ltd. (Tokyo, JP)
Primary Examiner: Orsino, Jr.; Joseph A.
Assistant Examiner:
Attorney, Agent or Firm: Ratner & Prestia
In an optical digital communication system having a plurality of optical repeaters inserted in an optical fiber cable, and a pair of terminal stations installed at the extreme ends of the optical fiber cable, the designation of the particular repeater from the terminal station is performed by the remote control signal which has the pulse pattern with the period designated to each repeater. Each repeater may have a plurality of switches for switching lasers for improving the operational reliability of the same by the redundant technique, and the control and/or the designation of the particular switch is also performed by said remote control signal by selecting the particular period and/or the repetition numbers of the period of the pulse pattern. Since the pulse pattern with the particular period and/or the repetition times of the period, and/or the repetition times and the sequence of the periods are utilized for designating the particular repeater and the switch in the designated repeater, the large number of objects (repeaters and switches) can be controlled, and the operational reliability of the control (designation) is very high. |
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DETAILED DESCRIPTION It is an object of the present invention to overcome the disadvantages and limitations of a prior remote control system of an optical repeater by providing a new and improved remote control system of an optical repeater.
It is also an object of the present invention to provide a remote control system of an optical repeater which has many control objects and controls each of the objects (repeaters and/or switches in the designated repeater) with high operational reliability, without utilizing an interstitial cable.
The above and other objects are attained by a remote control system of an optical repeater comprising of a plurality of optical repeaters inserted in an optical fiber line a pair of terminal stations installed at the ends of the optical fiber line for the digital communication between said terminal stations, each of said optical repeaters having a plurality of switches for controlling the operation of the repeater, each of said switches being controlled by one of said terminal stations, one of the terminal stations having a remote control signal generator for transmitting the remote control test signal to the other terminal station only through the same optical fiber line and the repeaters, said remote control test signal being in the digital form having the pulse pattern with a predetermined period and a predetermined number of repetitions of said period and said period and the repetition times designating the particular repeater and the particular switch in the designated repeater, each optical repeater has a remote control signal detector which recognizes the remote control test signal as designating the particular repeater and the particular switch in the particular repeater.
In addition, each optical repeater has means for accepting the remote control test signal without change and without a separate pulse generator for testing the particular repeater and the particular switch by using the pulse pattern to perform the tests and transmitting the pattern back to the terminal station
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Fault Detection 
