Monitoring system using an optical side tone as a test signal

Details Monitoring system using an optical side tone as a test signal Monitoring system using an optical side tone as a test signal

1996-10-09

1999-10-19

Bacares, Rafael

Optical: systems and elements

Deflection using a moving element

Using a periodically moving element

359177, H04B 1008

Patent

active

059698330

ABSTRACT:
An improved monitoring system for monitoring a fiber optic transmission system using optical side tones. The monitoring system includes a line monitoring equipment (LME) connected to a portion of an optical transmission system. The LME includes a pseudo-random sequence (PRS) tone generator for generating a PRS tone, a laser transmitter for transmitting an LME optical side tone based on the PRS tone. The LME includes a delay system for delaying the PRS tones, an optical filter for passing only the wavelength of the LME side tone. A plurality of data channels are transmitted over the system using WDM. A coupler is used to combine the WDM data with the LME side tone. A repeater having an optical loopback coupler returns a portion of the combined signal to the LME. The comparator/correlator correlates the delayed PRS tones with the LME side tone returned by each repeater.

REFERENCES:
patent: 4586186 (1986-04-01), Anderson
patent: 4633464 (1986-12-01), Anderson
patent: 5485299 (1996-01-01), Jones
patent: 5528404 (1996-06-01), Mackichan
patent: 5654816 (1997-08-01), Fishman
patent: 5703711 (1997-12-01), Hamada
Novel tehnique for monitoring long-haul undersea opt-amp systems. OFC '94, vol. 4 Feb. 1994 Technical Digest.

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