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Title:
DYNAMIC MONITORING AND CALIBRATION OF NODES IN AN OPTICAL NETWORKING DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/149140
Kind Code:
A1
Abstract:
A monitoring and calibration apparatus for an optical networking device such as ROADM is provided. Reflectors are integrated into the device, for example at the ends of optical interconnect cables. The reflectors reflect light in specific monitoring wavelengths and pass other wavelengths such as those used for communication. A light source emits monitoring light which is reflected by the reflector and measured by a detector to measure the integrity of optical paths. The optical paths can include optical cables and cable connectors. Path integrity between different modules of the device can therefore be monitored. Multiple reflectors, reflecting light in different wavelengths, can be placed in series along the same optical path and used to monitor multiple segments of the path. A wavelength selective switch (WSS) of the device can be used to route monitoring light to different optical paths. The WSS also operates to route communication signals in the device.

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Inventors:
MANSOURI RAD MOHAMMAD MEHDI (CA)
MEHRVAR HAMID (CA)
JIANG ZHIPING (CA)
BERNIER ERIC (CA)
Application Number:
PCT/CN2019/073085
Publication Date:
August 08, 2019
Filing Date:
January 25, 2019
Export Citation:
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Assignee:
HUAWEI TECH CO LTD (CN)
International Classes:
G02B6/26
Foreign References:
US5031985A1991-07-16
US20160313182A12016-10-27
CN1391097A2003-01-15
US20080291431A12008-11-27
US20160187224A12016-06-30
US20170294959A12017-10-12
Other References:
CHRISTOPHER BENTZ ET AL.: "Signal to Noise Ratio (SNR) Enhancement Comparison of Impulse-, Coding-, and Novel Linear-Frequencv-Chip-Based Optical Time Domain Reflectometry (OTDR) for Passive Optical Network (PON) Monitoring Based on Unique Combinations of Wavelength Selective Mirrors", PHOTONICS, vol. 1, no. 1, 20 March 2014 (2014-03-20), pages 33 - 46
See also references of EP 3698184A4
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