CN101018116A - High-speed optical forward unit compatible to the dual-mode jitter performance - Google Patents
High-speed optical forward unit compatible to the dual-mode jitter performance Download PDFInfo
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- CN101018116A CN101018116A CNA200610003535XA CN200610003535A CN101018116A CN 101018116 A CN101018116 A CN 101018116A CN A200610003535X A CNA200610003535X A CN A200610003535XA CN 200610003535 A CN200610003535 A CN 200610003535A CN 101018116 A CN101018116 A CN 101018116A
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04J3/06—Synchronising arrangements
- H04J3/0635—Clock or time synchronisation in a network
- H04J3/0685—Clock or time synchronisation in a node; Intranode synchronisation
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Abstract
The disclosed high-speed (such as 40Gb/s) optical transmission unit with bimode jittering performance comprises a phase-lock loop circuit that includes two phase-lock loop circuits with different jittering features and a clock circuit selection switch to select corresponding circuit for jittering request according control signal. This invention satisfies variable application conditions.
Description
Technical field
The present invention relates to the optical transport technology field, relate in particular to a kind of high-speed optical forward unit with double mode jitter performance compatibility, and a kind of optical transmission device of using this high-speed optical forward unit.
Background technology
In dense wave division multipurpose (WDM) system, need a large amount of optical convering units (OTU) that use, be used for the standard of on system terminal or relay, finishing/non-standard wavelength Conversion.And the optical convering unit performance depends on the performance of its clock circuit to a great extent.In the WDM transmission system, generally adopt optical convering unit, to guarantee the multiplexing of two-forty signal and transmission with low jitter characteristic at transmitting terminal.In the relay, then use to have jitter toleration height, jitter transfer function optical convering unit preferably, thereby the signal that guarantees the process long-distance transmissions can recover and regenerate under the jitter toleration of broad.
The optical convering unit clock circuit realizes that by the phase-locked loop clock module PLL clock circuit has determined output jitter characteristic and the jitter transfer function of OTU, when requiring OTU to have less output jitter, requires the bandwidth of phase-locked loop less; When requiring OTU to have preferably jitter transfer function, the bandwidth of phase lock loop of requirement is bigger than normal.Therefore, in the WDM transmission system, the clock circuit that optical convering unit adopted defines its applied environment, considers from output jitter characteristic and jitter transfer function angle, if optical convering unit is pursued good output jitter characteristic, then general this optical convering unit is used for system's transmitting terminal; If optical convering unit is pursued good jitter transfer function, then this optical convering unit generally is used for the relay.Both contradictions are not very outstanding in traditional 10Gb/s optical transmission device, generally need only the phase-locked loop relevant parameter of appropriate design optical convering unit, and this retransmission unit can satisfy system simultaneously to output jitter characteristic and jitter transfer function requirement.But in the 40Gb/s optical transmission device, traditional PLL clock circuit technology is difficult to guarantee simultaneously 40Gb/s optical convering unit output jitter characteristic and jitter transfer function.
Based on consideration to the problems referred to above, need a kind of new high-speed optical forward unit with double mode jitter performance compatibility, guarantee the jitter performance of high-speed optical forward unit, make high-speed optical forward unit can flexible Application in different application scenarios, be particularly suitable for having in the optical transmission device of light crossing, thereby reduce the cost of optical transmission device to a certain extent.
Summary of the invention
Technical problem to be solved by this invention is, a kind of high-speed optical forward unit with double mode jitter performance compatibility is provided, and the optical transmission device of this high speed retransmission unit of a kind of application, in order to overcome the problem that existing optical transmission system clock treatment technology is single, be difficult to satisfy the requirement of high-speed optical forward unit jittering characteristic.
The invention provides a kind of high-speed optical forward unit, comprise signal processing module, phase-locked loop circuit module with double mode jitter performance compatibility, wherein,
Signal processing module is used for the reference clock signal sent here according to the phase-locked loop circuit module, and the system output signal of input line side wherein to the system input signal of system side and system side to the line side carried out signal processing and transmit and export corresponding signal,
This high-speed optical forward unit also can comprise the board type control module, is used for controlling signal to the phase-locked loop circuit module according to the external control signal output board type selecting of input;
Wherein said phase-locked loop circuit module comprises: first phase-locked loop circuit, second phase-locked loop circuit, and clock circuit selector switch, wherein,
First phase-locked loop circuit is used for producing first pll clock signal that can make high-speed optical forward unit satisfy system's transmitting terminal output jitter characteristic according to input clock signal, and this signal is delivered to the clock circuit selector switch,
Second phase-locked loop circuit is used for producing second pll clock signal that can make high-speed optical forward unit satisfy system's relay jitter transfer function according to input clock signal, and this signal is delivered to the clock circuit selector switch,
The clock circuit selector switch, be used for selecting control signal according to the board type of board type control module output, when described selection control signal indicator board type is system's transmitting terminal, select described first pll clock signal, when described selection control signal indicator board type is the system relay, select described second pll clock signal, and export the reference clock input of signal processing module to reference clock signal as clock signal as signal processing module with signals selected.
Described first phase-locked loop circuit comprises the multistage phase-locked loop of cascade; Described second phase-locked loop circuit comprises the one-level phase-locked loop; Described board type control module can be a field programmable gate array or can be CPLD also, is subjected to the webmaster control unit control of transmission system and instructs output board type selecting control signal according to the webmaster control unit of system.
The present invention also provides a kind of optical transmission device, comprises at least one optical splitter, and the input optical signal beam split that is used for that prime equipment is sent here is a plurality of branch road light signals; At least one first high-speed optical forward unit is used for transmit the corresponding branch road signal of telecommunication of output from least one branch road light signal of described optical splitter; Cross unit is used for the branch road signal of telecommunication of transmitting from first high-speed optical forward unit is intersected; At least one second high-speed optical forward unit is used for a branch road signal of telecommunication after the cross unit cross processing is transmitted the corresponding branch road light signal of output; At least one splicer, be used for to merge into a light signal from the branch road light signal of at least one second high-speed optical forward unit and send into back level equipment, wherein, described first, second high-speed optical forward unit comprises: signal processing module, phase-locked loop circuit module, the characteristics of this optical transmission device are
Described first, second high-speed optical forward unit also comprises the board type control module, is used for controlling signal to the phase-locked loop circuit module according to the external control signal output board type selecting of input;
Described phase-locked loop circuit module comprises: first phase-locked loop circuit, second phase-locked loop circuit, and clock circuit selector switch, wherein,
First phase-locked loop circuit is used for producing first pll clock signal that can make high-speed optical forward unit satisfy system's transmitting terminal output jitter characteristic according to input clock signal, and this signal is delivered to the clock circuit selector switch,
Second phase-locked loop circuit is used for producing second pll clock signal that can make high-speed optical forward unit satisfy system's relay jitter transfer function according to input clock signal, and this signal is delivered to the clock circuit selector switch,
The clock circuit selector switch, be used for selecting control signal according to the board type of board type control module output, when described selection control signal indicator board type is system's transmitting terminal, select described first pll clock signal, when described selection control signal indicator board type is the system relay, select described second pll clock signal, and export the reference clock input of signal processing module to reference clock signal as clock signal as signal processing module with signals selected.
Wherein, described cross unit comprises the light tributary signal interface that is used for this flash of light preceding an earthquake of I/O tributary signal.
Described second high-speed optical forward unit when the branch road signal of telecommunication after the cross unit cross processing of originating from local light tributary signal is transmitted, selects first pll clock signal as transmitting reference clock signal by described clock circuit selector switch.
Described second high-speed optical forward unit when the branch road signal of telecommunication after the cross unit cross processing of the light signal that is derived from prime equipment is transmitted, is selected by described clock circuit selector switch
Described first high-speed optical forward unit when the branch road light signal after the optical splitter light-splitting processing of the light signal that is derived from prime equipment is transmitted, selects second pll clock signal as transmitting reference clock signal by described clock circuit selector switch.
Described clock circuit selector switch is selected control signal according to the board type of being exported according to the webmaster control unit instruction of system from the described board type control module of the webmaster control unit control that is subjected to transmission system, carries out reference clock signal and selects.
Described board type is selected control signal, be to judge signal type and report the webmaster control unit according to the signal source by described cross unit earlier, after by the webmaster control unit signal type being handed down to described board type control module again, produced and delivered to described clock circuit selector switch by described board type control module, wherein, in signal source during from prime equipment, this board type selects control signal to indicate described high-speed optical forward unit as the relay optical convering unit, when the signal originating from local, this board type selects control signal to indicate described high-speed optical forward unit as the transmitting terminal optical convering unit.
Described first phase-locked loop circuit comprises the multistage phase-locked loop of cascade.Described second phase-locked loop circuit comprises the one-level phase-locked loop.Described board type control module is field programmable gate array or CPLD.Described input clock signal is local input clock signal or outside input clock signal.
Use the high-speed optical forward unit with double mode jitter performance compatibility provided by the present invention, compared with prior art, owing to taked the clock circuit choice mechanism of flexibility and reliability, make high-speed optical forward unit clock jitter performance can satisfy application request, same optical convering unit both can be used for system's transmitting terminal, also can be used for the system relay, in having the optical transmission device of interleaving function, also can between different transmission performances, switch, reduced equipment cost, optimized the system transmissions performance, especially in the wire rate higher system (for example 40Gb/s transmission system) has bigger advantage.
Description of drawings
Fig. 1 is the structured flowchart with high-speed optical forward unit of double mode jitter performance compatibility;
Fig. 2 is the structural representation of a specific embodiment with high-speed optical forward unit of double mode jitter performance compatibility;
Fig. 3 is a kind of structural representation of optical transmission device with high-speed optical forward unit of double mode jitter performance compatibility.
Embodiment
Below in conjunction with accompanying drawing and preferred embodiment of the present invention, the present invention is described in further detail.
The present invention proposes a kind of high-speed optical forward unit with double mode jitter performance compatibility, the high-speed optical forward unit compatibility that is proposed two kinds of different jittering characteristics, that is:
1. the narrower clock circuit of bandwidth of phase lock loop, frequency stability is higher;
2. the clock circuit of bandwidth of phase lock loop broad, corresponding jitter transfer function broad.
As shown in Figure 1, it is structured flowchart with high-speed optical forward unit of double mode jitter performance compatibility, this optical convering unit is made of signal processing module, phase-locked loop circuit module, board type control module, wherein, phase-locked loop circuit module (dashed rectangle part) comprises phase-locked loop circuit (PLL_A, PLL_B) and clock circuit selector switch (SW).In Fig. 1, institute makes marks and is described as follows:
CLK_INPUT is local input clock signal;
PLL_A, PLL_B are respectively phase-locked loop circuit A, phase-locked loop circuit B;
CLK_A, CLK_B are respectively clock signal A, clock signal B;
SW is the clock selecting switch;
CTRL is the board type control signal;
CLK_OUTPUT is clock signal;
REF_CLK is the reference clock signal of signal processing module;
TX is the output signal of system;
RX is the input signal of system;
Signal processing module is mainly used in and finishes the multiplexing of signal, B1/J0 detection and functions such as insertion, opto-electronic conversion.
The topmost innovation part of the present invention is the phase-locked loop circuit module section shown in the dashed rectangle among Fig. 1, and it adds that by two kinds of clock extracting circuits (PLL_A, PLL_B) clock circuit selector switch (SW) forms.The bandwidth of phase lock loop of clock circuit A is narrower, generally form by multistage phase-locked loop cascade, clock signal clk _ the A of output has less output jitter, when clock circuit selector switch is chosen CLK_A, the CLK_OUTPUT clock signal has less output jitter, corresponding optical convering unit output jitter is little, can satisfy the requirement of transmitting terminal optical convering unit.The bandwidth of phase lock loop broad of clock circuit B, generally form by the one-level phase-locked loop, loop filter bandwidth can be arranged on about 1KHz, the transfer function broader bandwidth, allow clock signal clk _ B that bigger jitter toleration is arranged like this, choose CLK_B when clock circuit selector switch, the CLK_OUTPUT clock signal has jitter transfer function preferably, corresponding optical convering unit jitter transfer function is good, can satisfy the requirement of relay to optical convering unit.
The board type control module, according to the concrete application scenario of optical convering unit, by the clock circuit choice mechanism, selector is should the PLL clock circuit of optical convering unit characteristic.Clock signal through selecting output is as the work reference clock of signal processing module.Clock circuit selection course of the present invention can be controlled by software, and the feasible method of a kind of convenience is to control by the webmaster control unit of optical transmission device, does not get rid of other forms of instruction generation method.Can set the transmission characteristic of optical convering unit flexibly, to satisfy its performance requirement as optical transmission device transmitting terminal or relay.
As shown in Figure 2, it is a specific embodiment with high-speed optical forward unit of double mode jitter performance, the phase-locked loop circuit with narrow bandwidth among Fig. 2 is realized by the two-stage phase-locked loop, clock circuit A is by two-stage phase-locked loop circuit PLL_A1, PLL_A2 constitutes, the bandwidth of two-stage phase-locked loop is close, CLK_INPUT is produced by this locality or the external clock reference input, enter second level phase-locked loop pll _ A2 again through the clock signal clk _ A1 after one-level phase-locked loop pll _ A1 processing, clock signal clk _ the A2 of output has minimum shake, and the transfer function after the stack of two-stage phase-locked loop is also narrower.Clock circuit B is made up of the one-level phase-locked loop, and loop filter bandwidth can be arranged on about 1KHz, and the transfer function broader bandwidth allows clock signal clk _ B that bigger jitter toleration is arranged like this.
As shown in Figure 3, be a kind of typical application mode of high-speed optical forward unit in optical transmission device with double mode jitter performance compatibility, below it is elaborated.
In Fig. 3, ODU is an optical branching filter; OMU is an optical multiplexer; OTU11,12 ..., 1n, OTU21,22 ..., 2n, OTU31,32 ..., 3n, OTU41,42 ..., 4n is respectively optical convering unit; CS is the light cross unit; OTI (opticai tributary interface) is a light tributary signal interface; S1, S2 are two service signals.
Optical transmission device as shown in Figure 3 has crossing, for remote signaling, this equipment is equivalent to the relay, the optical signals of process long-distance transmissions is in the influence of signal attenuation and system noise, can produce a large amount of shakes, therefore require in the light forwarding unit optical convering unit OTU (as: OTU21,22 ..., 2n, OTU41,42 ..., 4n) have the jitter toleration of broad, to guarantee that synchronizing clock signals can effectively be recovered and transmit.For the light tributary signal of this locality, this equipment is equivalent to transmitting terminal, and the clock circuit jitter transfer function of corresponding OTU should be narrow, produces the stable reference clock signal of high frequency, guarantees that the modulating/demodulating of high speed business signal is handled.
As shown in Figure 3, behind the optical signals ODU of long-distance transmissions partial wave, the input OTU11,12 ..., 1n, OTU31,32 ..., 3n, signal is realized light/electricity conversion in the OTU32 unit, cross unit CS is crossed to OTU21 with output signal S1, because the S1 signal jitter is bigger, OTU21 selects the clock circuit of jitter transfer function broad, the S1 signal is handled, finished electricity/light conversion, after OMU closes ripple, export to next stage equipment, what in this case, OTU21 realized is the function of relay optical convering unit.Light tributary signal by this locality generation, after intersecting, output signal S2, S2 Signal Processing (especially when holding wire speed is higher) needs the work clock of degree of precision to cooperate, and ensures signal quality at signal sending end as much as possible, and OTU21 selects the narrow clock circuit of jitter transfer function, synchronised clock as the S2 signal, the signal of finishing after the wavelength Conversion closes the output of wave direction next stage equipment through OMU, and in this case, what OTU21 realized is the function of transmitting terminal optical convering unit.
In the optical transmission device of Fig. 3, an optical convering unit may be only as transmitting terminal or relay OTU, also may in a period of time, make transmitting terminal OTU, another section made relay OTU (as OTU21) in the period, need select the clock circuit of OTU21 in the different periods, determine its operating characteristic.
The following describes OTU and how to select to control clock.At first system to OTU21 the type of signal S1 to be processed or S2 judge, signal type is determined by the source of signal by cross unit CS, and report, thereby determine that OTU21 is as the transmitting terminal optical convering unit or the relay optical convering unit uses to network management unit.Webmaster issues the type of OTU21 to the board type control module on this optical convering unit.The board type control module can adopt field programmable gate array (FPGA) to realize, after FPGA receives the webmaster order, output type is selected control signal CTRL, diverter switch SW from the circuit, select output clock CLK_A2 or CLK_B, last clock signal CLK_OUTPUT offers signal processing module, and the work reference clock REF_CLK as module is used for the processing such as modulating/demodulating of signal.
Adopt above clock circuit choice mechanism, realized the switching of OTU21 mode of operation real-time reliable, optimized the performance of optical transmission device greatly.
Claims (17)
1, a kind of high-speed optical forward unit with double mode jitter performance compatibility comprises the signal place
Reason module, phase-locked loop circuit module, wherein,
Signal processing module is used for the reference clock signal sent here according to the phase-locked loop circuit module, and the system output signal of input line side wherein to the system input signal of system side and system side to the line side carried out signal processing and transmit and export corresponding signal,
It is characterized in that, also comprise the board type control module, be used for controlling signal to the phase-locked loop circuit module according to the external control signal output board type selecting of input;
Described phase-locked loop circuit module comprises: first phase-locked loop circuit, second phase-locked loop circuit, and clock circuit selector switch, wherein,
First phase-locked loop circuit is used for producing first pll clock signal that can make high-speed optical forward unit satisfy system's transmitting terminal output jitter characteristic according to input clock signal, and this signal is delivered to the clock circuit selector switch,
Second phase-locked loop circuit is used for producing second pll clock signal that can make high-speed optical forward unit satisfy system's relay jitter transfer function according to input clock signal, and this signal is delivered to the clock circuit selector switch,
The clock circuit selector switch, be used for selecting control signal according to the board type of board type control module output, when described selection control signal indicator board type is system's transmitting terminal, select described first pll clock signal, when described selection control signal indicator board type is the system relay, select described second pll clock signal, and export the reference clock input of signal processing module to reference clock signal as clock signal as signal processing module with signals selected.
2, high-speed optical forward unit as claimed in claim 1 is characterized in that, described first phase-locked loop circuit comprises the multistage phase-locked loop of cascade.
3, high-speed optical forward unit as claimed in claim 1 is characterized in that, described second phase-locked loop circuit comprises the one-level phase-locked loop.
4, high-speed optical forward unit as claimed in claim 1 is characterized in that, described board type control module is a field programmable gate array.
5, high-speed optical forward unit as claimed in claim 1 is characterized in that, described board type control module is subjected to the webmaster control unit control of transmission system and instructs output board type selecting control signal according to the webmaster control unit of system.
6, high-speed optical forward unit as claimed in claim 1 is characterized in that, described input clock signal is local input clock signal or outside input clock signal.
7, a kind of optical transmission device comprises at least one optical splitter, and the input optical signal beam split that is used for that prime equipment is sent here is a plurality of branch road light signals; At least one first high-speed optical forward unit is used for transmit the corresponding branch road signal of telecommunication of output from least one branch road light signal of described optical splitter; Cross unit is used for the branch road signal of telecommunication of transmitting from first high-speed optical forward unit is intersected; At least one second high-speed optical forward unit is used for a branch road signal of telecommunication after the cross unit cross processing is transmitted the corresponding branch road light signal of output; At least one splicer, be used for merging into a light signal from the branch road light signal of at least one second high-speed optical forward unit and send into back level equipment, wherein, described first, second high-speed optical forward unit comprises: signal processing module, phase-locked loop circuit module, it is characterized in that
Described first, second high-speed optical forward unit also comprises the board type control module, is used for controlling signal to the phase-locked loop circuit module according to the external control signal output board type selecting of input;
Described phase-locked loop circuit module comprises: first phase-locked loop circuit, second phase-locked loop circuit, and clock circuit selector switch, wherein,
First phase-locked loop circuit is used for producing first pll clock signal that can make high-speed optical forward unit satisfy system's transmitting terminal output jitter characteristic according to input clock signal, and this signal is delivered to the clock circuit selector switch,
Second phase-locked loop circuit is used for producing second pll clock signal that can make high-speed optical forward unit satisfy system's relay jitter transfer function according to input clock signal, and this signal is delivered to the clock circuit selector switch,
The clock circuit selector switch, be used for selecting control signal according to the board type of board type control module output, when described selection control signal indicator board type is system's transmitting terminal, select described first pll clock signal, when described selection control signal indicator board type is the system relay, select described second pll clock signal, and export the reference clock input of signal processing module to reference clock signal as clock signal as signal processing module with signals selected.
8, optical transmission device as claimed in claim 7 is characterized in that, described cross unit comprises the light tributary signal interface that is used for this flash of light preceding an earthquake of I/O tributary signal.
9, optical transmission device as claimed in claim 8, it is characterized in that, described second high-speed optical forward unit, when the branch road signal of telecommunication after the cross unit cross processing of originating from local light tributary signal is transmitted, select first pll clock signal as transmitting reference clock signal by described clock circuit selector switch.
10, optical transmission device as claimed in claim 7, it is characterized in that, described second high-speed optical forward unit, when the branch road signal of telecommunication after the cross unit cross processing of the light signal that is derived from prime equipment is transmitted, select second pll clock signal as transmitting reference clock signal by described clock circuit selector switch.
11, optical transmission device as claimed in claim 7, it is characterized in that, described first high-speed optical forward unit, when the branch road light signal after the optical splitter light-splitting processing of the light signal that is derived from prime equipment is transmitted, select second pll clock signal as transmitting reference clock signal by described clock circuit selector switch.
12, as claim 9 or 10 or 11 described optical transmission devices, it is characterized in that, described clock circuit selector switch, select control signal according to the board type of being exported according to the webmaster control unit instruction of system from the described board type control module of the webmaster control unit control that is subjected to transmission system, carry out reference clock signal and select.
13, optical transmission device as claimed in claim 12, it is characterized in that, described board type is selected control signal, be to judge signal type and report the webmaster control unit according to the signal source by described cross unit earlier, after by the webmaster control unit signal type being handed down to described board type control module again, produced and delivered to described clock circuit selector switch by described board type control module, wherein, in signal source during from prime equipment, this board type selects control signal to indicate described high-speed optical forward unit as the relay optical convering unit, when the signal originating from local, this board type selects control signal to indicate described high-speed optical forward unit as the transmitting terminal optical convering unit.
14, optical transmission device as claimed in claim 7 is characterized in that, described first phase-locked loop circuit comprises the multistage phase-locked loop of cascade.
15, optical transmission device as claimed in claim 7 is characterized in that, described second phase-locked loop circuit comprises the one-level phase-locked loop.
16, optical transmission device as claimed in claim 7 is characterized in that, described board type control module is a field programmable gate array.
17, optical transmission device as claimed in claim 7 is characterized in that, described input clock signal is local input clock signal or outside input clock signal.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610003535XA CN100568796C (en) | 2006-02-09 | 2006-02-09 | High-speed optical forwarding unit compatible with dual-mode jitter performance |
| PCT/CN2006/003734 WO2007090333A1 (en) | 2006-02-09 | 2006-12-30 | High-speed optical transfer unit with two modes jitter performance compatibility |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB200610003535XA CN100568796C (en) | 2006-02-09 | 2006-02-09 | High-speed optical forwarding unit compatible with dual-mode jitter performance |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN101018116A true CN101018116A (en) | 2007-08-15 |
| CN100568796C CN100568796C (en) | 2009-12-09 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB200610003535XA Expired - Fee Related CN100568796C (en) | 2006-02-09 | 2006-02-09 | High-speed optical forwarding unit compatible with dual-mode jitter performance |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN100568796C (en) |
| WO (1) | WO2007090333A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386990A (en) * | 2011-12-21 | 2012-03-21 | 烽火通信科技股份有限公司 | Method and device for realizing 1588 clock synchronization in OTN system |
| CN102625547A (en) * | 2012-04-23 | 2012-08-01 | 英飞特电子（杭州）有限公司 | Dimming signal interface circuit |
| CN104320135A (en) * | 2014-11-03 | 2015-01-28 | 成都赛英科技有限公司 | High-purity frequency source |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119232244B (en) * | 2024-12-02 | 2025-02-25 | 中国电子科技集团公司第五十四研究所 | A satellite-borne clock network system and a master-backup switching method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3825319B2 (en) * | 1999-08-20 | 2006-09-27 | 富士通株式会社 | Optical communication system, optical receiver and wavelength converter |
| US7039323B2 (en) * | 2001-08-13 | 2006-05-02 | Sun Microsystems, Inc. | Optical transmitter for transmitting a plurality of output signals |
| US7092639B2 (en) * | 2001-12-27 | 2006-08-15 | Intel Corporation | EMI shield for reducing clock jitter of a transceiver |
| CN1306744C (en) * | 2002-12-21 | 2007-03-21 | 中兴通讯股份有限公司 | Clock circuit for optical transmission belt with error correction system |
-
2006
- 2006-02-09 CN CNB200610003535XA patent/CN100568796C/en not_active Expired - Fee Related
- 2006-12-30 WO PCT/CN2006/003734 patent/WO2007090333A1/en active Application Filing
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102386990A (en) * | 2011-12-21 | 2012-03-21 | 烽火通信科技股份有限公司 | Method and device for realizing 1588 clock synchronization in OTN system |
| CN102625547A (en) * | 2012-04-23 | 2012-08-01 | 英飞特电子（杭州）有限公司 | Dimming signal interface circuit |
| CN104320135A (en) * | 2014-11-03 | 2015-01-28 | 成都赛英科技有限公司 | High-purity frequency source |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100568796C (en) | 2009-12-09 |
| WO2007090333A1 (en) | 2007-08-16 |
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