Apparatus and method for monitoring optical signal

Details Apparatus and method for monitoring optical signal Apparatus and method for monitoring optical signal

2007-02-06

2007-02-06

Phan, Hanh (Department: 2613)

Optical communications

Diagnostic testing

Determination of communication parameter

C398S025000, C398S026000, C398S027000, C398S029000, C398S034000, C398S038000, C398S081000, C398S093000, C398S094000, C398S095000, C398S147000, C398S148000, C398S152000, C398S154000, C398S155000, C398S158000, C398S159000, C398S161000, C398S183000, C398S192000, C398S195000, C398S198000, C398S208000, C398S209000, C385S024000, C385S037000

Reexamination Certificate

active

10739060

ABSTRACT:
This invention provides a technique for realizing low-cost optical signal waveform monitoring with improved realtimeness to be applied to signal quality monitoring in an actual optical transmission system, and a technique for stably controlling an optical transmitter/receiver and various compensators by means of this waveform monitoring. Opening/closing of a optical gate is controlled by means of a clock signal synchronized with an optical signal input from a photocoupler and having a period equal to the bit interval of data or N (N: a positive integer) times longer than the bit interval to allow each pulse of the optical signal for one bit of data to pass through the optical gate for only part of the time width of the gate. A photoelectric conversion element to which the optical signal transmitted through the optical gate for only part of the time width obtains an average light intensity of the input optical signal. Information on this average light intensity is output to a monitoring output section.

REFERENCES:
patent: 6411416 (2002-06-01), Ooi et al.
patent: 6681081 (2004-01-01), Mao
patent: 11-68657 (1999-03-01), None
N. Hanik, et al., “Application of amplitude histograms to monitor performance of optical channels”, Electronics Letters, Mar. 4, 1999, vol. 35 No. 5, pp. 403-404.

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