CN107534625B - Signal processing method, node and device - Google Patents
Signal processing method, node and device Download PDFInfo
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- CN107534625B CN107534625B CN201580078957.0A CN201580078957A CN107534625B CN 107534625 B CN107534625 B CN 107534625B CN 201580078957 A CN201580078957 A CN 201580078957A CN 107534625 B CN107534625 B CN 107534625B
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L25/00—Baseband systems
- H04L25/02—Details ; arrangements for supplying electrical power along data transmission lines
- H04L25/03—Shaping networks in transmitter or receiver, e.g. adaptive shaping networks
Abstract
The invention discloses a signal processing method, which is suitable for the technical field of communication. The method comprises the following steps: receiving an optical signal, converting the optical signal into an electrical signal, and converting the electrical signal into a digital signal; extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency; and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information. In the embodiment of the invention, the pilot frequency is inserted, then the power of the pilot frequency on the left side and the power of the pilot frequency on the right side are calculated through the power function, the phase discrimination information is obtained through calculation according to the sum of the power of the pilot frequency on the left side and the sum of the power of the pilot frequency on the right side, and the obtained phase discrimination information can accurately reflect the frequency offset of the signal transmitted by the second node, so that the second node can accurately adjust the frequency of the transmitted signal.
Description
Technical Field
The present invention relates to the field of communications technologies, and in particular, to a signal processing method, a node, and an apparatus.
Background
The rapid development of video, cloud computing and mobile internet has made higher requirements on the capacity and utilization efficiency of an Optical Transport Network (OTN). The ultra-Dense Wavelength Division Multiplexing (DWDM) technology with the frequency interval smaller than 10GHz has high frequency band utilization rate and flexibility, the line rate can reach 40G and 100G, and the DWDM technology has great application value in future transmission networks. At present, the central frequency drift of a commonly used laser in optical communication can reach +/-5GHz, and when optical signals transmitted between two nodes or a point-to-multipoint main node and each access node of a ring network in an optical transmission network are filtered through a link, the performance is seriously influenced, and the communication performance is influenced. The existing frequency correction method mainly detects the power of the left and right side bands and calculates the frequency offset according to the power of the left and right side bands, but the frequency offset calculation completely based on the symmetry of the signal spectrum shape is easily affected by the frequency offset of a receiver and the bandwidth of the receiver, and the frequency offset of a transmitter laser cannot be accurately reflected.
Disclosure of Invention
The embodiment of the invention provides a signal processing method, a node and a device, wherein a first node calculates and obtains phase discrimination information according to the sum of the power of a left side band pilot frequency and the sum of the power of a right side band pilot frequency, and the obtained phase discrimination information can accurately reflect the frequency offset of a signal transmitted by a second node, so that the second node can accurately adjust the frequency of the transmitted signal.
In a first aspect, a method of signal processing is provided, including:
receiving an optical signal, converting the optical signal into an electrical signal, and converting the electrical signal into a digital signal;
extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency;
and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information.
With reference to the first aspect, in a first possible implementation manner of the first aspect, the obtaining phase discrimination information according to the sum of the powers of the left and right band pilots specifically includes:
and subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information, or subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information.
With reference to the first aspect, in a second possible implementation manner of the first aspect, the obtaining phase discrimination information according to the sum of the powers of the left and right band pilots specifically includes:
subtracting the sum of the products of each left pilot power and the corresponding weight from the sum of the products of each right pilot power and the corresponding weight to obtain phase discrimination information, or subtracting the weighted sum of each left pilot power from the weighted sum of each right pilot power to obtain phase discrimination information, wherein the weight is equal to the power of the corresponding channel frequency response of each pilot.
In a second aspect, a node is provided, comprising a receiver and a transmitter, wherein the receiver comprises:
the photoelectric conversion unit is used for receiving an optical signal and converting the optical signal into an electrical signal;
the analog-to-digital conversion unit is used for converting the electric signal into a digital signal;
the processing unit is used for extracting the left pilot frequency and the right pilot frequency from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating phase discrimination information according to the sum of the power of the left pilot frequency and the sum of the power of the right pilot frequency;
and the transmitter is used for inserting the phase discrimination information into an optical signal to be transmitted and transmitting the optical signal inserted with the phase discrimination information.
With reference to the second aspect, in a first possible implementation manner of the second aspect, the processor is specifically configured to:
and subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information, or subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information.
With reference to the second aspect, in a second possible implementation manner of the second aspect, the processor is specifically configured to:
subtracting the sum of the products of each left pilot power and the corresponding weight from the sum of the products of each right pilot power and the corresponding weight to obtain phase discrimination information, or subtracting the weighted sum of each left pilot power from the weighted sum of each right pilot power to obtain phase discrimination information, wherein the weight is equal to the power of the corresponding channel frequency response of each pilot.
In a third aspect, an optical transmission system is provided, comprising the above-mentioned node.
In a fourth aspect, there is provided a data communication apparatus comprising a processor, a memory and a bus system, the processor and the memory being connected by the bus system, the memory being adapted to store instructions and the processor being adapted to execute instructions stored by the memory,
wherein the processor is configured to: receiving an optical signal, converting the optical signal into an electrical signal, and converting the electrical signal into a digital signal; extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency; and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information.
Based on the above technical solution, in the embodiment of the present invention, the first section receives an optical signal, converts the optical signal into an electrical signal, converts the electrical signal into a digital signal, extracts left and right band pilots from the digital signal, calculates power of the left band pilot and power of the right band pilot, calculates phase discrimination information according to the sum of the power of the left band pilot and the power of the right band pilot, inserts the phase discrimination information into an optical signal to be transmitted, and transmits the optical signal into which the phase discrimination information is inserted. And the second node adjusts the frequency of the transmitting signal according to the phase discrimination information. In the embodiment of the invention, the pilot frequency is inserted, then the power of the pilot frequency on the left side and the power of the pilot frequency on the right side are calculated through the power function, the phase discrimination information is obtained through calculation according to the sum of the power of the pilot frequency on the left side and the sum of the power of the pilot frequency on the right side, and the obtained phase discrimination information can accurately reflect the frequency offset of the signal transmitted by the second node, so that the second node can accurately adjust the frequency of the transmitted signal.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments of the present invention will be briefly described below, and it is obvious that the drawings described below are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a schematic block diagram of an application scenario provided in an embodiment of the present invention;
fig. 2 is a flowchart of a signal processing method according to an embodiment of the present invention;
FIG. 3 is a schematic block diagram of a data frame and a spectrum of a signal provided by an embodiment of the present invention;
fig. 4 is a schematic block diagram of a node according to an embodiment of the present invention;
fig. 5 is a schematic block diagram of an optical transmission system according to an embodiment of the present invention;
fig. 6 is a schematic block diagram of a data communication device according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, not all, embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, shall fall within the scope of protection of the present invention.
Fig. 1 shows a scenario in which the embodiments of the present invention are applied, where nodes a to J are Network nodes in an Optical transport Network, where the nodes may be ONU (Optical Network Unit) or OLT (Optical Line Terminal) devices, or may be base stations.
In a first aspect, as shown in fig. 2, an embodiment of the present invention discloses a method for processing a signal, including the steps of:
step 201: the first node receives the optical signal sent by the second node, converts the optical signal into an electrical signal and then converts the electrical signal into a digital signal.
The first node may be any one of the nodes a to J in fig. 1, and the second node may be any other node, for example, the first node is node a, and the second node is node J.
For a second node sending an optical signal, the second node generates a pilot frequency with symmetrical left and right sidebands and inserts the pilot frequency with symmetrical left and right sidebands into a data frame of a signal to be sent, and then modulates an optical carrier wave of the signal to be sent to obtain a modulated optical signal and sends the modulated optical signal to a first node. Wherein, the power of every two symmetrical left pilot carriers is equal to the power of the right pilot carriers.
Specifically, the second node generates a left-right sideband symmetric pilot frequency, and the left-side and right-side sideband pilot frequencies are added into the baseband signal at the same time or in a time-sharing manner and then loaded onto the optical carrier through modulation. The second node generates pilot frequency in various ways, and generates the digital pilot frequency, then superimposes the digital pilot frequency with the digital baseband signal, converts the digital pilot frequency into an analog signal, and modulates the analog signal on an optical carrier to obtain a modulated optical signal. Another way to generate pilots is: firstly, pilot frequency in an analog form is generated, then the pilot frequency is superposed with an analog baseband signal, and the analog signal modulates an optical carrier to obtain a modulated optical signal. The pilot frequency is inserted in a preferred time-sharing mode, and the time-sharing sending pilot frequency can respectively detect the pilot frequency power of the left and right sidebands, so that the problem that the frequency offset cannot be calculated by directly detecting the pilot frequency power difference of the left and right sidebands in an optical transmission system is solved. The pilot frequency is inserted in a preferred time-sharing mode, and the time-sharing sending pilot frequency can respectively detect the pilot frequency power of the left and right sidebands, so that the problem that the frequency offset cannot be calculated by directly detecting the pilot frequency power difference of the left and right sidebands in an optical transmission system is solved. For the first node, when the transmitted left and right sideband pilots are simultaneously added, the left and right sideband information of the pilots are extracted from the data frame, and the power of the left and right sideband pilots is detected respectively. When the transmitted left and right sideband pilot frequencies are added in a time-sharing manner, the left and right sideband information of the pilot frequency is extracted from the data frame, and the pilot frequency powers of the left and right sidebands are respectively detected in a time-sharing manner.
When the left-side band pilot and the right-side band pilot are added to the digital baseband signal in a time-sharing manner, left-side and right-side band indication information is also inserted into the data frame of the data to be transmitted, as shown in fig. 3, to indicate whether the left-side band pilot or the right-side band pilot is currently transmitted. For example, 0 represents the left band pilot and 1 represents the right band pilot. Where Overhead represents Overhead and Payload represents Payload.
Step 202: the first node extracts the left pilot frequency and the right pilot frequency from the digital signal, calculates the power of the left pilot frequency and the power of the right pilot frequency, and calculates the phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency.
There are several ways to obtain the phase detection information, one of which is: the first node subtracts the sum of all the left pilot powers from the sum of all the right pilot powers to obtain phase discrimination information:
or the first node subtracts the sum of all right pilot powers and all left pilot powers from the sum of all right pilot powers to obtain phase discrimination information:
wherein p islsb，iRepresents the power of the ith (i is more than or equal to 1 and less than or equal to m, and m is a natural number) pilot frequency of the left sideband. p is a radical ofrsb，iRepresents the power of the ith (i is more than or equal to 1 and less than or equal to m, and m is a natural number) pilot frequency of the right sideband.
The other way is that the first node subtracts the sum of the products of each left pilot power and the corresponding weight from the sum of the products of each right pilot power and the corresponding weight to obtain phase discrimination information:
or the first node subtracts the weighted sum of each right pilot power with the right pilot power to obtain the phase discrimination information:
wherein h isiThe weights corresponding to the ith (i is more than or equal to 1 and less than or equal to m, m is a natural number) pilot frequency in the left and right side bands, and preferably, the weight corresponding to the ith left band pilot frequency or the ith right band pilot frequency is equal to the power of the channel frequency response corresponding to the ith left or right pilot frequency.
Step 203: and the first node inserts the phase discrimination information into an optical signal to be transmitted and then transmits the optical signal inserted with the phase discrimination information to the second node.
The second node receives the optical signal transmitted by the first node, converts the optical signal into an electrical signal, converts the electrical signal into a digital signal, extracts phase discrimination information from a data frame of the digital signal, and adjusts the frequency of a transmitted signal according to the phase discrimination information. If the phase discrimination information indicates that the frequency of the sending signal is less than the normal frequency, the second node increases the frequency of the sending signal according to a preset step length; on the contrary, if the phase discrimination information indicates that the frequency of the sending signal is greater than the normal frequency, the second node reduces the frequency of the sending signal according to the preset step length.
In a second aspect, as shown in fig. 4, an embodiment of the present invention further discloses a node according to the foregoing embodiment, where the node includes a receiver 31 and a transmitter 32, where the receiver 31 includes:
the photoelectric conversion unit 310 is configured to receive an optical signal and convert the optical signal into an electrical signal.
An analog-to-digital conversion unit 311, configured to convert the electrical signal into a digital signal.
A processing unit 312, configured to extract left and right side band pilots from the digital signal, calculate power of the left side band pilot and power of the right side band pilot, and calculate phase discrimination information according to a sum of the power of the left side band pilot and a sum of the power of the right side band pilot.
In one embodiment, the processing unit 312 subtracts the sum of all the left-side pilot powers from the sum of all the right-side pilot powers to obtain the phase detection information, or subtracts the sum of all the right-side pilot powers from the sum of all the left-side pilot powers to obtain the phase detection information. In another embodiment, the processing unit 312 subtracts the sum of the products of each left-side pilot power and the corresponding weight from the sum of the products of each right-side pilot power and the corresponding weight to obtain the phase discrimination information, or subtracts the weighted sum of each left-side pilot power from the weighted sum of each right-side pilot power to obtain the phase discrimination information, where the weight is equal to the power of the frequency response of the channel corresponding to each pilot.
And the transmitter 32 is configured to insert the phase discrimination information into an optical signal to be transmitted, and transmit the optical signal into which the phase discrimination information is inserted.
There are a number of ways in which the transmitter 32 generates the pilot, one way of generating the pilot is: firstly, generating a digital pilot frequency, then overlapping the digital pilot frequency with a digital baseband signal, converting the digital pilot frequency into an analog signal, and modulating an optical carrier by the analog signal to obtain a modulated optical signal. Another way to generate pilots is: firstly, pilot frequency in an analog form is generated, then the pilot frequency is superposed with an analog baseband signal, and the analog signal modulates an optical carrier to obtain a modulated optical signal. The pilot frequency is inserted in a preferred time-sharing mode, and the time-sharing sending pilot frequency can respectively detect the pilot frequency power of the left and right sidebands, so that the problem that the frequency offset cannot be calculated by directly detecting the pilot frequency power difference of the left and right sidebands in an optical transmission system is solved.
In a third aspect, as shown in fig. 5, an embodiment of the present invention discloses an optical transmission system, which at least includes the first node and the second node, where the first node and the second node both include a receiver and a transmitter. Wherein the receiver and the transmitter can refer to the corresponding description shown in fig. 4, and are not described here again.
In a fourth aspect, as shown in fig. 6, an embodiment of the present invention further provides a data communication apparatus 600, where the apparatus 600 includes a processor 610, a memory 620, and a bus system 630, where the processor 610 and the memory 620 are connected via the bus system 630, the memory 620 is configured to store instructions, and the processor 610 is configured to execute the instructions stored in the memory 620, where the processor 610 is configured to receive an optical signal, convert the optical signal into an electrical signal, and convert the electrical signal into a digital signal; extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency; and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information.
Specifically, the processor 610 subtracts the sum of all the left-side pilot powers from the sum of all the right-side pilot powers to obtain the phase detection information, or the first node subtracts the sum of all the right-side pilot powers from the sum of all the left-side pilot powers to obtain the phase detection information. In a second manner, the processor 610 subtracts the sum of the products of each left-side pilot power and the corresponding weight from the sum of the products of each right-side pilot power and the corresponding weight to obtain phase discrimination information, or the first node subtracts the weighted sum of each right-side pilot power from the weighted sum of each left-side pilot power to obtain phase discrimination information, where the weight is equal to the power of the frequency response of the channel corresponding to each pilot.
The specific execution flow of the specific processor 610 may refer to the description corresponding to the flowchart shown in fig. 2, and is not described herein again.
It should be understood that, in the embodiment of the present invention, the processor 610 may be a Central Processing Unit (CPU), and the processor 610 may also be other general processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field Programmable Gate Arrays (FPGAs) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, and the like. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The memory 620 may include both read-only memory and random access memory, and provides instructions and data to the processor 610. A portion of the memory 620 may also include non-volatile random access memory. For example, the memory 620 may also store device type information.
The bus system 630 may include a power bus, a control bus, a status signal bus, and the like, in addition to the data bus. For clarity of illustration, however, the various buses are designated in the figure as the bus system 630.
Those of ordinary skill in the art will appreciate that the elements and algorithm steps of the examples described in connection with the embodiments disclosed herein may be embodied in electronic hardware, computer software, or combinations of both, and that the components and steps of the examples have been described in a functional general in the foregoing description for the purpose of illustrating clearly the interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment of the present invention.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention essentially or partially contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product stored in a storage medium and including instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
While the invention has been described with reference to specific embodiments, the invention is not limited thereto, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (8)
1. A method of signal processing, comprising:
receiving an optical signal, converting the optical signal into an electrical signal, and converting the electrical signal into a digital signal;
extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency;
and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information.
2. The method according to claim 1, wherein the obtaining phase detection information according to the sum of the powers of the left side band pilot and the right side band pilot specifically comprises:
and subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information, or subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information.
3. The method according to claim 1, wherein the obtaining phase detection information according to the sum of the powers of the left side band pilot and the right side band pilot specifically comprises:
subtracting the sum of the products of each left pilot power and the corresponding weight from the sum of the products of each right pilot power and the corresponding weight to obtain phase discrimination information, or subtracting the weighted sum of each left pilot power from the weighted sum of each right pilot power to obtain phase discrimination information, wherein the weight is equal to the power of the corresponding channel frequency response of each pilot.
4. A node comprising a receiver and a transmitter, wherein the receiver comprises:
the photoelectric conversion unit is used for receiving an optical signal and converting the optical signal into an electrical signal;
the analog-to-digital conversion unit is used for converting the electric signal into a digital signal;
the processing unit is used for extracting the left pilot frequency and the right pilot frequency from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating phase discrimination information according to the sum of the power of the left pilot frequency and the sum of the power of the right pilot frequency;
and the transmitter is used for inserting the phase discrimination information into an optical signal to be transmitted and transmitting the optical signal inserted with the phase discrimination information.
5. The node according to claim 4, wherein the processing unit is specifically configured to:
and subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information, or subtracting the sum of all the pilot powers of the right bands from the sum of all the pilot powers of the left bands to obtain the phase discrimination information.
6. The node according to claim 4, wherein the processing unit is specifically configured to:
subtracting the sum of the products of each left pilot power and the corresponding weight from the sum of the products of each right pilot power and the corresponding weight to obtain phase discrimination information, or subtracting the weighted sum of each left pilot power from the weighted sum of each right pilot power to obtain phase discrimination information, wherein the weight is equal to the power of the corresponding channel frequency response of each pilot.
7. An optical transmission system comprising a node as claimed in any one of claims 4 to 6.
8. A data communication device, comprising a processor, a memory and a bus system, the processor and the memory being connected via the bus system, the memory being adapted to store instructions and the processor being adapted to execute instructions stored by the memory,
wherein the processor is configured to: receiving an optical signal, converting the optical signal into an electrical signal, and converting the electrical signal into a digital signal; extracting left and right pilot frequencies from the digital signal, calculating the power of the left pilot frequency and the power of the right pilot frequency, and calculating to obtain phase discrimination information according to the sum of the power of the left pilot frequency and the power of the right pilot frequency; and inserting the phase discrimination information into an optical signal to be transmitted, and transmitting the optical signal inserted with the phase discrimination information.
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| CN115333654B (en) * | 2022-10-13 | 2023-02-03 | 成都爱旗科技有限公司 | Frequency offset detection method, system and electronic equipment |
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| CN1190184A (en) * | 1997-01-27 | 1998-08-12 | Gpt有限公司 | Wavelength manager |
| US7412166B2 (en) * | 2003-04-30 | 2008-08-12 | Tellabs Operations, Inc. | Pilot tones for optical signal wavelength identification and power measurement |
| CN102215079A (en) * | 2011-06-03 | 2011-10-12 | 武汉邮电科学研究院 | Frequency shift elimination method based on multi-wavelength relevant optical communication system |
| CN103312645A (en) * | 2013-06-05 | 2013-09-18 | 华中科技大学 | Self-adaptive damage compensation method and system for digital-related optical communication system |
| CN103733516A (en) * | 2011-06-10 | 2014-04-16 | 技术研究及发展基金公司 | Receiver, transmitter and a method for digital multiple sub-band processing |
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| US7346279B1 (en) * | 2002-03-25 | 2008-03-18 | Forster Energy Llc | Optical transceiver using heterodyne detection and a transmitted reference clock |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1190184A (en) * | 1997-01-27 | 1998-08-12 | Gpt有限公司 | Wavelength manager |
| US7412166B2 (en) * | 2003-04-30 | 2008-08-12 | Tellabs Operations, Inc. | Pilot tones for optical signal wavelength identification and power measurement |
| CN102215079A (en) * | 2011-06-03 | 2011-10-12 | 武汉邮电科学研究院 | Frequency shift elimination method based on multi-wavelength relevant optical communication system |
| CN103733516A (en) * | 2011-06-10 | 2014-04-16 | 技术研究及发展基金公司 | Receiver, transmitter and a method for digital multiple sub-band processing |
| CN103312645A (en) * | 2013-06-05 | 2013-09-18 | 华中科技大学 | Self-adaptive damage compensation method and system for digital-related optical communication system |
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