OPTICAL COMMUNICATION SYSTEM ALLOWING MAINTENANCE

Japanese Patent JPH09186658

A

PROBLEM TO BE SOLVED: To monitor a signal routing of a multiple wavelength optical network by allowing the system to be made up of an output difference element connecting to an inverting input, a noninverting input and a dithering element, a dither signal generator and a feedback element giving input of a signal relating to an output of the dithering element to the inverting input of the difference element. SOLUTION: An intensity modulator 2 is arranged in series with an optical carrier 4 modulated by an information signal. A differential amplifier circuit 7 has an inverting input, a noninverting input and an output connecting to an input of the intensity modulator 2 as a dither element and is made up of an adder 6 and an operational amplifier conditioner 8. A signal generator 10 generates a desired identifier tone and overhead information to be added to a modulation optical carrier. Furthermore, the signal generator 10 connects to the noninverting input of the differential amplifier 7. Furthermore, the feedback element is used to generate a signal relating to an output of the intensity modulator 2 based on a modulation index of the identifier tone.

FATEHI MOHAMMAD T (US)
HEISMANN FRED LUDWIG (US)

JP32924896A

July 15, 1997

December 10, 1996

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LUCENT TECHNOLOGIES INC (US)

H04B10/588; H04B10/077; H04B10/079; H04B10/27; H04B10/29; H04B10/54; (IPC1-7): H04B10/20

JPH0621897A	1994-01-28
JPH07154330A	1995-06-16
JPH05292037A	1993-11-05
JPH03206427A	1991-09-09
JPH06338874A	1994-12-06
JPH0661946A	1994-03-04
JPH07131421A	1995-05-19
JPH04293025A	1992-10-16
JPH05241209A	1993-09-21
JPH04150324A	1992-05-22
JPH0669890A	1994-03-11

Hirofumi Mimata

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