Optical network for detecting collisions based on the reflection

Details Optical network for detecting collisions based on the reflection Optical network for detecting collisions based on the reflection

1994-05-16

1995-02-14

Chilcot, Jr., Richard E.

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359173, 359135, 370 853, H04J 1402

Patent

active

053900391

ABSTRACT:
When a communication network system is constructed using an optical fiber as a transmission path, a node which transmits a signal may receive its own transmission signal upon reflection of an optical signal on the transmission path. When access control to a network is performed by a CSMA/CD method, the reflection signal may be erroneously detected as a signal sent from another node, and a collision which has not actually occurred may be detected. In order to avoid this, a reflection signal component of the transmission signal must be removed from a reception signal. For this purpose, a time-inverted signal of the transmission signal, and the reception signal are modulated, and the modulated signals are then input to a convolver, thereby obtaining a convolution integral value between the two signals. Since the transmission signal component included in the reception signal can be detected from the obtained value, the detected transmission signal component is removed from the reception signal component, and a signal transmitted from another node can be extracted. In this manner, erroneous detection of a collision upon reflection of a signal transmitted from its own node can be prevented.

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"Services Integration and Multiplexing for Broad-Band Communication Systems", I.E.E.E. Journal on Selected Areas in Communications, vol. SAC-4, No. 4, Jul. 1986, pp. 551-564.

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