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公开(公告)号：US10938484B2
公开(公告)日：2021-03-02
申请号：US16586392
申请日：2019-09-27
发明人： Zhiping Jiang , Xuefeng Tang
IPC分类号： H04B10/08 , H04B10/61 , H04J14/02 , H04B10/079
摘要： The disclosed systems, structures, and methods are directed to monitoring performance of optical networks. Transmitted and received optical channel signal has both low-power gaps and an amplitude modulation pilot tone applied. The low-power gaps are applied at a gap frequency with gap power being lower than a signal power of the optical channel signal. The pilot tone is applied to the optical channel signal at a pilot tone modulation frequency, which is different from the gap frequency. Described methods include determining pilot tone modulation depth based on detected gap power in low-power gaps of the received optical channel signal. Amplifier spontaneous emission and nonlinear noise in optical link are detected separately. This permits determining and monitoring of optical signal-to-noise ratio.
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公开(公告)号：US10727937B1
公开(公告)日：2020-07-28
申请号：US16289904
申请日：2019-03-01
发明人： Ali Salehiomran , Zhiping Jiang
IPC分类号： H04B10/071 , H04B10/073
摘要： In some examples, an apparatus includes a multi-layer code generator to generate codewords based on application of a plurality of layers of encoding, an optical source to produce encoded optical pulses based on the generated codewords, and an optical coupler to propagate the encoded optical pulses to an optical medium.
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公开(公告)号：US10673528B1
公开(公告)日：2020-06-02
申请号：US16284414
申请日：2019-02-25
发明人： Zhiping Jiang , Chuandong Li , Zhuhong Zhang
IPC分类号： H04B10/2507 , H04B10/50 , H04B10/40 , H04B10/60 , H04B10/112 , H04B10/116 , H04B10/114 , H04B10/11
摘要： The disclosed systems, apparatuses and methods are directed to controlling optical channel signal and an optical network equipment in optical networks. The methods comprise adjusting an optical channel spectrum based on bit error rates (BER) measured for a dithered optical channel signal. The optical channel spectrum is dithered such that a signal reference frequency is alternated between a first second signal reference frequency and a second signal reference frequency. BER is measured and analysed separately for the dithered signal reference frequency being detuned to the first and to the second signal reference frequencies. Based on a BER difference between BER at the first signal reference frequency and BER at the second signal reference frequency, the optical channel spectrum is shifted with regards to frequency in order to improve optical network performance.
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公开(公告)号：US10659153B2
公开(公告)日：2020-05-19
申请号：US16504262
申请日：2019-07-06
发明人： Jian Zhong , Zhiping Jiang , Rui He
IPC分类号： H04B10/077 , G01M11/00 , H04B10/27
摘要： The application provides a method for measuring a dispersion coefficient of an optical fiber. A network device sends a first optical supervisory channel (OSC) measurement signal and a second OSC measurement signal, where wavelengths of the first OSC measurement signal and the second OSC measurement signal are different. The network device receives the returned first OSC measurement signal and second OSC measurement signal, where the first OSC measurement signal and the second OSC measurement signal are transmitted through a first optical fiber and a second optical fiber to return to the network device, and the first optical fiber and the second optical fiber are a to-be-tested optical fiber. The network device determines a delay difference between the received first OSC measurement signal and second OSC measurement signal. The network device determines a dispersion coefficient of the to-be-tested optical fiber based on the delay difference.
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公开(公告)号：US20190036600A1
公开(公告)日：2019-01-31
申请号：US15665351
申请日：2017-07-31
发明人： Zhiping Jiang , Xuefeng Tang
IPC分类号： H04B10/079
摘要： A system for monitoring optical signal-to-noise ratio (OSNR) is provided. In some specific examples, the system may use a pilot tone power of a signal modulated with pilot tone to derive the pure signal power and the variance of the whole electric field to derive the total power (pure signal power plus amplified spontaneous emission (ASE) power of the signal). The ASE power can be obtained by subtracting the pure signal power from the total power (ASE+pure signal). Once the ASE power and the pure signal power are known, the OSNR can be calculated.
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公开(公告)号：US20170373748A1
公开(公告)日：2017-12-28
申请号：US15200325
申请日：2016-07-01
发明人： Zhiping Jiang , Tejia Liu , Hong Yang , Dajiang Jin , Minggang Si
IPC分类号： H04B10/077
摘要： The disclosure is directed at a method and system for optical telecommunications performance monitoring via a dual frequency pilot tone. By applying a dual frequency pilot tone, with a first pilot tone frequency selected from a low frequency band and a second pilot tone frequency selected from a high frequency band, either simultaneously or alternatively, to a wavelength channel, one of the pilot tone frequencies may be adaptively selected to improve wavelength channel monitoring. More specifically, stimulated Raman scattering (SRS) caused crosstalk and chromatic dispersion (CD) caused pilot fading which adversely affect performance monitoring of the wavelength channel may be reduced.
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公开(公告)号：US09749723B2
公开(公告)日：2017-08-29
申请号：US14877280
申请日：2015-10-07
发明人： Zhiping Jiang , Chen Chen , Zhuhong Zhang , Chuandong Li
CPC分类号： H04Q11/0005 , H04B10/25 , H04B10/503 , H04B10/572 , H04J14/021 , H04J14/0275 , H04J14/0282 , H04Q2011/0015 , H04Q2011/0016 , H04Q2011/0018 , H04Q2011/0032 , H04Q2011/0033 , H04Q2011/0039 , H04Q2011/0041 , H04Q2011/005 , H04Q2011/0058
摘要： An optical circuit switching matrix includes a plurality of optical ports, each optical port being optically coupled to a respective one of a plurality of user nodes and an optical coupler having at least one input port optically coupled to the plurality of optical ports, and an output port. The optical circuit switching matrix also includes a wavelength demultiplexer having an input optically coupled to the output port of the optical coupler, and a plurality of output ports, each output port being optically coupled to a respective one of the plurality of optical ports.
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公开(公告)号：US11768274B2
公开(公告)日：2023-09-26
申请号：US16921174
申请日：2020-07-06
发明人： Ali Ahmed Ali Massoud , Zhiping Jiang , Haitao Sun
IPC分类号： G01S7/481 , G01S17/10 , G01S17/931 , G01S7/486 , B60R11/00
CPC分类号： G01S7/4817 , G01S7/486 , G01S7/4814 , G01S7/4816 , G01S17/10 , G01S17/931 , B60R11/00 , B60R2011/004 , B60R2011/0026 , B60R2011/0049
摘要： The disclosed systems, structures, and methods are directed to a LiDAR system comprising a radiation source configured to emit light pulses towards a region of interest (ROI), a detector configured to detect light pulses reflected from the ROI, a processor, communicatively coupled to the radiation source and the detector, configured to cause the radiation source to emit a preamble light pulse having an energy EP and a pulse width W1 towards the ROI, determine, if the preamble light pulse is detected by the detector and whether there is an object in the ROI, responsive to a determination that there is an object in the ROI, cause the radiation source to emit a scanning light pulse having an energy EL and a pulse width W2 towards the ROI, else the radiation source to emit a scanning light pulse having an energy EH and the pulse width W2 towards the ROI.
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公开(公告)号：US11757555B2
公开(公告)日：2023-09-12
申请号：US17521984
申请日：2021-11-09
发明人： Zhiping Jiang , Jun Luo , Haitao Sun
IPC分类号： H04B10/071 , H04J14/02
CPC分类号： H04J14/0227 , H04B10/071 , H04J14/0212 , H04J14/0213
摘要： The disclosed systems, structures, and methods are directed to an optical transceiver, employing a first optical time domain reflectometer (OTDR) module configured to generate a first OTDR signal, and a second OTDR signal, the second OTDR signal being a delayed version of the first OTDR signal, a first optical supervisory channel (OSC) transmitter configured to generate a first OSC signal, and a second OSC signal, the second OSC signal being a delayed version of the first OSC signal, a first wavelength division multiplexer (WDM) configured to transmit the first OSC signal interleaved with the first OTDR signal on a first optical fiber and a second WDM configured to transmit the second OSC signal interleaved with the second OTDR signal on a second optical fiber.
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公开(公告)号：US11652547B2
公开(公告)日：2023-05-16
申请号：US17484668
申请日：2021-09-24
发明人： Zhiping Jiang , Simin Wang
IPC分类号： H04B10/079 , H04J14/02
CPC分类号： H04B10/07953 , H04J14/021
摘要： A method to determine the types of optical fibers forming a link of an optical communication network. By scanning a signal's bit error rate at a receiver end, as a function of a pre-dispersion applied to a signal at a transmitter end, local minimums in the curve indicate the presence of amplifiers, and therefore fiber span extremities. By determining the accumulated dispersion at each fiber extremity, a ratio of dispersion per span length can be obtained and the span's coefficient of chromatic dispersion be inferred, thereby identifying the type of fiber. Alternatively, a signal's signal-to-noise ratio can be scanned, instead of its bit error rate. In a typical network, the required instrumentation is pre-existing.
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