Network remote multi-node time deviation measurement calibrator

Abstract

A network remote multi-node time deviation measurement calibrator, characterized in that the measurement calibrator comprises: a network reference node processing module (0), first to Nth network remote node processing modules (1), (2),..., (N), a first optical switch (S1), a second optical switch (S2), first to Nth bidirectional transmission channel single-mode optical fibers (G1), (G2),..., (GN), and first to Nth measurement calibration channel single-mode optical fibers (X1), (X2),..., (XN).

Description

Technical Field

[0001] This invention relates to the fields of optical fiber communication and laser measurement, and in particular to a network remote multi-node time deviation measuring instrument. Background Technology

[0002] In transoceanic long-range communications, deep space communications, and distributed coherent aperture radar (DAC) networks, time synchronization among multiple network nodes is crucial. Currently, most methods rely on multi-satellite approaches to determine clock skew between remote communication nodes. However, the high cost of satellite communications and the susceptibility of clock synchronization stability to interference caused by atmospheric turbulence limit further improvements in clock skew measurement accuracy due to both cost and technological constraints. In recent years, the low-loss characteristics of optical fibers and the improved performance of various integrated optical devices have led to the gradual maturation and decreasing cost of long-distance optical fiber communication network technology. This has made it possible to utilize laser technology to achieve high-precision measurement and correction of clock skew between remote network nodes. Summary of the Invention

[0003] The technical problem to be solved by this invention is to overcome the shortcomings of existing network node clock deviation measurement technology and to propose a high-precision network remote multi-node time deviation measurement and calibration instrument based on bidirectional laser mutual calibration.

[0004] The technical solution of the present invention: A network remote multi-node time deviation measurement and calibration instrument includes: a network reference node processing module, a first to Nth network remote node processing module, a first optical switch, a second optical switch, a first to Nth bidirectional transmission channel single-mode optical fiber, and a first to Nth measurement and calibration channel single-mode optical fiber. The connections of the various devices are as follows: The bidirectional transmission port of the network reference node processing module is connected to the combining port of the first optical switch. The first port of the first optical switch is connected to one end of the single-mode fiber of the first bidirectional transmission channel, and the other end of the single-mode fiber of the first bidirectional transmission channel is connected to the bidirectional transmission port of the first network remote node processing module. The second port of the first optical switch is connected to one end of the single-mode fiber of the second bidirectional transmission channel, and the other end of the single-mode fiber of the second bidirectional transmission channel is connected to the bidirectional transmission port of the second network remote node processing module. ... The Nth port of the first optical switch is connected to one end of the single-mode fiber of the Nth bidirectional transmission channel, and the other end of the single-mode fiber of the Nth bidirectional transmission channel is connected to the bidirectional transmission port of the Nth network remote node processing module. The measurement and calibration port of the network reference node processing module is connected to the combining port of the second optical switch. The first port of the second optical switch is connected to one end of the single-mode fiber of the first measurement and calibration channel, and the other end of the single-mode fiber of the first measurement and calibration channel is connected to the measurement and calibration port of the first network remote node processing module. The second port of the second optical switch is connected to one end of the single-mode fiber of the second measurement and calibration channel, and the other end of the single-mode fiber of the second measurement and calibration channel is connected to the measurement and calibration port of the second network remote node processing module. ... The Nth port of the second optical switch is connected to one end of the single-mode fiber of the Nth measurement and calibration channel, and the other end of the single-mode fiber of the Nth measurement and calibration channel is connected to the measurement and calibration port of the Nth network remote node processing module. The network reference node processing module includes a reference single-pulse clock, a digital signal synthesizer, a semiconductor laser, a wavelength division multiplexing add / drop linker, a photodetector, a time-frequency converter, a spectrum analyzer, and a pluggable optical transceiver. The connections of the various devices are as follows: The output port of the reference single-pulse clock is connected to the input port of the digital signal synthesizer. The first output port of the digital signal synthesizer is connected to the input port of the semiconductor laser. The second output port of the digital signal synthesizer is connected to the second input port of the time-frequency converter. The output port of the semiconductor laser is connected to the first port of the uplink of the wavelength division multiplexing uplink / downlink device. The combining port of the wavelength division multiplexing uplink / downlink device serves as the bidirectional transmission port of the network reference node processing module. The down-channel port of the wavelength division multiplexing add-on / drop-off converter is connected to the input port of the photodetector. The output port of the photodetector is connected to the first input port of the time-frequency converter. The output port of the time-frequency converter is connected to the first input port of the spectrum analyzer. The output port of the spectrum analyzer is connected to the input port of the pluggable optical transceiver. The output port of the pluggable optical transceiver serves as the measurement and calibration port of the network reference node processing module. The Nth network remote node processing module includes a single-pulse clock to be measured and calibrated, a digital signal synthesizer, a semiconductor laser, a wavelength division multiplexing add / drop channel, a photodetector, a time-frequency converter, a spectrum analyzer, a pluggable optical transceiver, and a digital signal processor.

[0005] The connections of the various devices are as follows: The output port of the single-pulse clock to be measured and calibrated is connected to the input port of the digital signal synthesizer. The first output port of the digital signal synthesizer is connected to the input port of the semiconductor laser. The second output port of the digital signal synthesizer is connected to the second input port of the time-frequency converter. The output port of the semiconductor laser is connected to the uplink port of the wavelength division multiplexing uplink / downlink converter. The combining port of the wavelength division multiplexing uplink / downlink converter serves as the bidirectional transmission port of the network remote node processing module. The downlink port of the wavelength division multiplexing add-on / drop-off converter is connected to the input port of the photodetector. The output port of the photodetector is connected to the first input port of the time-frequency converter. The output port of the time-frequency converter is connected to the first input port of the spectrum analyzer. The output port of the pluggable optical transceiver is connected to the second input port of the spectrum analyzer. The output port of the spectrum analyzer is connected to the input port of the digital signal processor. The output port of the digital signal processor is connected to the input port of the single-pulse clock to be measured and calibrated. The input port of the pluggable optical transceiver serves as the measurement and calibration port of the network remote node processing module. Attached Figure Description

[0006] Figure 1 Network reference node processing module 0.

[0007] Figure 2 The Nth network remote node processing module N (N is an integer ≥ 1).

[0008] Figure 3 Network remote multi-node time deviation measurement and calibration instrument. Detailed Implementation

[0009] The present invention will now be further described with reference to the accompanying drawings.

[0010] like Figure 1 The network reference node processing module 0 includes a reference single-pulse clock 01, a digital signal synthesizer 02, a semiconductor laser 03, a wavelength division multiplexing add / drop linker 08, a photodetector 04, a time-frequency converter 05, a spectrum analyzer 06, and a pluggable optical transceiver 07.

[0011] The connections of the various devices are as follows: The output port of the reference single-pulse clock 01 is connected to the input port of the digital signal synthesizer 02. The first output port of the digital signal synthesizer 02 is connected to the input port of the semiconductor laser 03. The second output port of the digital signal synthesizer 02 is connected to the second input port of the time-frequency converter 05. The output port of the semiconductor laser 03 is connected to the first uplink port of the wavelength division multiplexing add-drop channel 08. The combining port of the wavelength division multiplexing add-drop channel 08 serves as the bidirectional transmission port of the network reference node processing module 0. The downlink port of the wavelength division multiplexing add / drop port 08 is connected to the input port of the photodetector 04. The output port of the photodetector 04 is connected to the first input port of the time-frequency converter 05. The output port of the time-frequency converter 05 is connected to the first input port of the spectrum analyzer 06. The output port of the spectrum analyzer 06 is connected to the input port of the pluggable optical transceiver 07. The output port of the pluggable optical transceiver 07 serves as the measurement and calibration port of the network reference node processing module 0.

[0012] like Figure 2The Nth network remote node processing module N includes: a single-pulse clock to be measured and calibrated N1, a digital signal synthesizer N2, a semiconductor laser N3, a wavelength division multiplexing add / drop channel N8, a photodetector N4, a time-frequency converter N5, a spectrum analyzer N6, a pluggable optical transceiver N7, and a digital signal processor N0.

[0013] The connections of the various devices are as follows: The output port of the single-pulse clock N1 to be measured and calibrated is connected to the input port of the digital signal synthesizer N2. The first output port of the digital signal synthesizer N2 is connected to the input port of the semiconductor laser N3. The second output port of the digital signal synthesizer N2 is connected to the second input port of the time-frequency converter N5. The output port of the semiconductor laser N3 is connected to the uplink port of the wavelength division multiplexing add-drop channel N8. The combining port of the wavelength division multiplexing add-drop channel N8 serves as the bidirectional transmission port of the network remote node processing module N. The down-channel port of wavelength division multiplexing add-on / drop-off converter N8 is connected to the input port of photodetector N4. The output port of photodetector N4 is connected to the first input port of time-frequency converter N5. The output port of time-frequency converter N5 is connected to the first input port of spectrum analyzer N6. The output port of pluggable optical transceiver N7 is connected to the second input port of spectrum analyzer N6. The output port of spectrum analyzer N6 is connected to the input port of digital signal processor N0. The output port of digital signal processor N0 is connected to the input port of single-pulse clock N1 to be measured and calibrated. The input port of pluggable optical transceiver N7 serves as the measurement and calibration port of network remote node processing module N.

[0014] like Figure 3 A network remote multi-node time deviation measurement and calibration instrument includes: a network reference node processing module 0, first to Nth network remote node processing modules 1, 2, ... N, a first optical switch S1, a second optical switch S2, first to Nth bidirectional transmission channel single-mode optical fibers G1, G2, ... GN, and first to Nth measurement and calibration channel single-mode optical fibers X1, X2, ... XN; The connections of the various devices are as follows: The bidirectional transmission port of the network reference node processing module 0 is connected to the combining port of the first optical switch S1. The first port of the first optical switch S1 is connected to one end of the first bidirectional transmission channel single-mode fiber G1, and the other end of the first bidirectional transmission channel single-mode fiber G1 is connected to the bidirectional transmission port of the first network remote node processing module 1. The second port of the first optical switch S1 is connected to one end of the second bidirectional transmission channel single-mode fiber G2, and the other end of the second bidirectional transmission channel single-mode fiber G2 is connected to the bidirectional transmission port of the second network remote node processing module 2. ... The Nth port of the first optical switch S1 is connected to one end of the Nth bidirectional transmission channel single-mode fiber GN, and the other end of the Nth bidirectional transmission channel single-mode fiber GN is connected to the bidirectional transmission port of the Nth network remote node processing module N. The measurement and calibration output port of the network reference node processing module 0 is connected to the combining port of the second optical switch S2. The first port of the second optical switch S2 is connected to one end of the first measurement and calibration channel single-mode fiber X1, and the other end of the first measurement and calibration channel single-mode fiber X1 is connected to the measurement and calibration port of the first network remote node processing module 1. The second port of the second optical switch S2 is connected to one end of the second measurement and calibration channel single-mode fiber X2, and the other end of the second measurement and calibration channel single-mode fiber X2 is connected to the measurement and calibration port of the second network remote node processing module 2. ... The Nth port of the second optical switch S2 is connected to one end of the Nth measurement and calibration channel single-mode fiber XN, and the other end of the Nth measurement and calibration channel single-mode fiber XN is connected to the measurement and calibration port of the Nth network remote node processing module N.

Claims

1. A network remote multi-node time deviation measurement and calibration instrument, characterized in that, The measurement and calibration instrument includes: a network reference node processing module (0), first to Nth network remote node processing modules (1), (2), ... (N), a first optical switch (S1), a second optical switch (S2), first to Nth bidirectional transmission channel single-mode optical fiber (G1), (G2), ... (GN), and first to Nth measurement and calibration channel single-mode optical fiber (X1), (X2), ... (XN); The connections of the various devices are as follows: The bidirectional transmission port of the network reference node processing module (0) is connected to the combining port of the first optical switch (S1). The first port of the first optical switch (S1) is connected to one end of the first bidirectional transmission channel single-mode fiber (G1), and the other end of the first bidirectional transmission channel single-mode fiber (G1) is connected to the bidirectional transmission port of the first network remote node processing module (1). The second port of the first optical switch (S1) is connected to one end of the second bidirectional transmission channel single-mode fiber (G2), and the other end of the second bidirectional transmission channel single-mode fiber (G2) is connected to the bidirectional transmission port of the second network remote node processing module (2). ... The Nth port of the first optical switch (S1) is connected to one end of the Nth bidirectional transmission channel single-mode fiber (GN), and the other end of the Nth bidirectional transmission channel single-mode fiber (GN) is connected to the bidirectional transmission port of the Nth network remote node processing module (N). The measurement and calibration port of the network reference node processing module (0) is connected to the combining port of the second optical switch (S2). The first port of the second optical switch (S2) is connected to one end of the first measurement and calibration channel single-mode fiber (X1), and the other end of the first measurement and calibration channel single-mode fiber (X1) is connected to the measurement and calibration port of the first network remote node processing module (1). The second port of the second optical switch (S2) is connected to one end of the second measurement and calibration channel single-mode fiber (X2), and the other end of the second measurement and calibration channel single-mode fiber (X2) is connected to the measurement and calibration port of the second network remote node processing module (2). ... The Nth port of the second optical switch (S2) is connected to one end of the Nth measurement and calibration channel single-mode fiber (XN), and the other end of the Nth measurement and calibration channel single-mode fiber (XN) is connected to the measurement and calibration port of the Nth network remote node processing module (N). The network reference node processing module (0) includes a reference single-pulse clock (01), a digital signal synthesizer (02), a semiconductor laser (03), a wavelength division multiplexing add / drop channel (08), a photodetector (04), a time-frequency converter (05), a spectrum analyzer (06), and a pluggable optical transceiver (07). The connections of the various devices are as follows: The output port of the reference single-pulse clock (01) is connected to the input port of the digital signal synthesizer (02). The first output port of the digital signal synthesizer (02) is connected to the input port of the semiconductor laser (03). The second output port of the digital signal synthesizer (02) is connected to the second input port of the time-frequency converter (05). The output port of the semiconductor laser (03) is connected to the first uplink port of the wavelength division multiplexing add-drop channel (08). The combining port of the wavelength division multiplexing add-drop channel (08) serves as the bidirectional transmission port of the network reference node processing module (0). The down-channel port of the wavelength division multiplexing add-drop port (08) is connected to the input port of the photodetector (04), the output port of the photodetector (04) is connected to the first input port of the time-frequency converter (05), the output port of the time-frequency converter (05) is connected to the first input port of the spectrum analyzer (06), the output port of the spectrum analyzer (06) is connected to the input port of the pluggable optical transceiver (07), and the output port of the pluggable optical transceiver (07) serves as the measurement and calibration port of the network reference node processing module (0). The Nth network remote node processing module, where N is an integer greater than or equal to 1, includes a single-pulse clock to be measured and calibrated (N1), a digital signal synthesizer (N2), a semiconductor laser (N3), a wavelength division multiplexing add / drop channel (N8), a photodetector (N4), a time-frequency converter (N5), a spectrum analyzer (N6), a pluggable optical transceiver (N7), and a digital signal processor (N0). The connections of the various devices are as follows: The output port of the single-pulse clock (N1) to be measured and calibrated is connected to the input port of the digital signal synthesizer (N2). The first output port of the digital signal synthesizer (N2) is connected to the input port of the semiconductor laser (N3). The second output port of the digital signal synthesizer (N2) is connected to the second input port of the time-frequency converter (N5). The output port of the semiconductor laser (N3) is connected to the uplink port of the wavelength division multiplexing add-drop-out switch (N8). The combining port of the wavelength division multiplexing add-drop-out switch (N8) serves as the bidirectional transmission port of the network remote node processing module (N). The down-channel port of the wavelength division multiplexing add-on / drop-off converter (N8) is connected to the input port of the photodetector (N4). The output port of the photodetector (N4) is connected to the first input port of the time-frequency converter (N5). The output port of the time-frequency converter (N5) is connected to the first input port of the spectrum analyzer (N6). The output port of the pluggable optical transceiver (N7) is connected to the second input port of the spectrum analyzer (N6). The output port of the spectrum analyzer (N6) is connected to the input port of the digital signal processor (N0). The output port of the digital signal processor (N0) is connected to the calibration input port of the single-pulse clock (N1) to be measured and calibrated. The input port of the pluggable optical transceiver (N7) serves as the measurement and calibration port of the network remote node processing module (N).

2. The network remote multi-node time deviation measurement and calibration instrument according to claim 1, characterized in that: The outputs of the semiconductor lasers (03), (13) ... (N3) are lasers located in the C-band of optical communication and with different wavelengths.

3. The network remote multi-node time deviation measurement and calibration instrument according to claim 1, characterized in that: The outputs of the digital signal synthesizers (02), (12) ... (N2) are frequency-modulated signals with different carrier frequencies and chirps.

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