WO2014166205A1 - 基于灵活栅格标签的频谱资源分配方法及装置 - Google Patents
基于灵活栅格标签的频谱资源分配方法及装置 Download PDFInfo
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- WO2014166205A1 WO2014166205A1 PCT/CN2013/083457 CN2013083457W WO2014166205A1 WO 2014166205 A1 WO2014166205 A1 WO 2014166205A1 CN 2013083457 W CN2013083457 W CN 2013083457W WO 2014166205 A1 WO2014166205 A1 WO 2014166205A1
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0224—Irregular wavelength spacing, e.g. to accommodate interference to all wavelengths
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0257—Wavelength assignment algorithms
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/0258—Wavelength identification or labelling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0227—Operation, administration, maintenance or provisioning [OAMP] of WDM networks, e.g. media access, routing or wavelength allocation
- H04J14/0254—Optical medium access
- H04J14/0256—Optical medium access at the optical channel layer
- H04J14/026—Optical medium access at the optical channel layer using WDM channels of different transmission rates
Definitions
- the present invention relates to the field of communications, and in particular, to a method and an apparatus for allocating a spectrum resource based on a flexible grid label.
- a reconfigurable optical add/drop multiplexer can implement local uplink and downlink and direct communication of channel wavelengths through software configuration, thereby enhancing the flexibility of optical network service transmission.
- Existing ROADM systems are wavelength-independent, direction-independent, and wavelength-independent (Colorless Directionless, Contentionless, CDC).
- the traditional wavelength division multiplexing system uses fixed grid technology, and the channel grid is 50 GHz or 100 GHz.
- the ultra-100G transmission technology has spawned the need for flexible grids (gridless or flexible grid) to accommodate different modulation patterns and different rates of wavelength division multiplexing transmission requirements.
- the flexible grid technology was initially standardized in February 2011 by the International Telecommunication Union Study Group 15 (ITU-T SG15) G.694.1 standard.
- the internal version of the draft standard document is V1.2, the standard nominal center.
- the frequency is 193.1THZ + nx 0.00625THz, where n is an integer and the normalized bandwidth is 12.5 GHz xm, where m is a positive integer.
- the ROADM system with flexible grid technology in this patent is referred to as the Flex ROADM system.
- the flexible grid wavelength labeling technology is used to implement the wavelength division multiplexing network, especially the wavelength trace function of the pure optical layer in the wavelength reconfigurable optical add/drop multiplexing system, which can distinguish and identify the wavelengths from different addresses in the system. .
- the flexible grid wavelength labeling technology adds a wavelength label signal, subcarrier information, etc. to each wavelength signal at the source end of the wavelength path of the wavelength division multiplexing optical switching system, and detects and recognizes the passing point at each point where the wavelength path passes. Labels for each wavelength to implement wavelength path monitoring and automatic discovery.
- the flexible grid wavelength label can be implemented by adding a topping signal to the wavelength signal. This method can bind the flexible grid wavelength label to the corresponding wavelength signal, and has less influence on the original signal quality.
- the technology of the grading technology involved in the flexible grid wavelength labeling technology is as follows:
- a pilot tone signal is applied to each wavelength to realize a variety of special applications, which has been studied in the industry.
- the topping signal is sometimes called a low-frequency dither signal, and the effect of the wavelength signal loading topping signal on the transmission performance is almost negligible.
- the related art only considers fixed frequency interval service transmission, does not consider the carrying of flexible raster information in the case of over 100 Gb/ s service rate, and does not consider the continuity problem of flexible grid channel subcarriers. In view of the above problems in the related art, an effective solution has not yet been proposed.
- the present invention provides a spectrum resource allocation method based on a flexible grid label, which is not yet effective in solving the technical problem that the channel range is not easily determined due to the problem of the flexible grid channel subcarrier continuation. And devices to solve at least the above problems.
- a method for allocating a spectrum resource based on a flexible grid label including: acquiring an identifier of a wavelength channel for transmitting flexible grid label information; and using the identifier pair to carry a flexible grid Each subcarrier of the label information is classified; in the wavelength channel corresponding to the identifier, the frequency range of the wavelength channel is determined according to the classified subcarrier information; and the spectrum resource is allocated according to the frequency range other wavelength channels except the wavelength channel Wherein, the wavelength channel and the other wavelength channels are used together to transmit flexible raster tag information.
- determining a frequency range of the wavelength channel according to the classified subcarrier information includes: when the subcarrier frequency in the wavelength channel corresponding to the identifier is discontinuous, according to the center frequency of each subcarrier in the wavelength channel and the frequency of each subcarrier The width determines the frequency range.
- determining a frequency range of the wavelength channel according to the classified subcarrier information includes: determining a frequency range according to a center frequency of the wavelength channel and a bandwidth of the wavelength channel when the subcarrier frequencies in the corresponding wavelength channel are consecutive .
- the obtaining the identifier of the wavelength channel for transmitting the flexible grid label information comprises: acquiring the identifier from the data frame for transmitting the flexible grid label information, wherein the data frame carries the identifier.
- the data frame further carries the following information: a nominal center frequency of the wavelength channel, a location identifier of each subcarrier center frequency in the frequency spectrum, and a number of bandwidth granularities.
- a flexible grid tag based spectrum resource allocation apparatus comprising: an obtaining module configured to acquire an identifier of a wavelength channel for transmitting flexible grid tag information; a classification module, setting And categorizing each subcarrier for carrying the flexible grid label information according to the foregoing identifier; the determining module is configured to determine, according to the subcarrier information corresponding to the identifier, a frequency range of the wavelength channel according to the classified subcarrier information; The allocation module is configured to allocate spectrum resources according to the frequency range for other wavelength channels except the wavelength channel, wherein the wavelength channel and the other wavelength channels are used together to transmit the flexible grid tag information.
- the determining module is configured to determine a frequency range according to each subcarrier center frequency and each subcarrier bandwidth in the wavelength channel when the subcarrier frequency in the corresponding wavelength channel is discontinuous.
- the determining module is configured to determine the frequency range according to the center frequency of the wavelength channel and the bandwidth of the wavelength channel when the subcarrier frequencies in the corresponding wavelength channel are consecutive.
- the obtaining module is configured to obtain an identifier from a data frame for transmitting flexible grid label information, where the data frame carries an identifier.
- the obtaining module is further configured to: obtain an identifier when the data frame carries the following information: a nominal center frequency of the wavelength channel, a location identifier of each subcarrier center frequency in the frequency spectrum, and a bandwidth granularity.
- each subcarrier for carrying flexible grid tag information is classified according to the identifier of the wavelength channel, and the frequency range of the wavelength channel is determined according to the classified subcarrier information, and further is another wavelength.
- FIG. 1 is a flowchart of a flexible grid tag based spectrum resource allocation method according to Embodiment 1 of the present invention
- FIG. 2 is a flexible grid tag based spectrum resource allocation apparatus according to Embodiment 1 of the present invention
- 3 is a schematic diagram of a wavelength label data frame format according to Embodiment 2 of the present invention
- FIG. 4 is a flowchart of a wavelength label transmission method according to Embodiment 2 of the present invention
- FIG. 5 is a wavelength label transmission according to Embodiment 2 of the present invention
- FIG. 6 is a schematic diagram showing the structure of another wavelength label transmission apparatus according to Embodiment 2 of the present invention
- FIG. 7 is a schematic diagram showing the spectrum of a fixed grid and a flexible grid network according to Embodiment 2 of the present invention.
- Step S102 Acquire an identifier of a wavelength channel for transmitting flexible grid label information
- Step S104 classify each subcarrier used to carry flexible grid label information according to the identifier
- the identifier is used to indicate a channel identifier where each subcarrier is located, such as a channel number.
- Step S106 Determine, in the wavelength channel corresponding to the identifier, a frequency range of the wavelength channel according to the classified subcarrier information.
- Step S108 allocate a spectrum resource according to a frequency range other than the wavelength channel, where The wavelength channel and other wavelength channels are commonly used to transmit the above flexible grid tag information.
- each subcarrier for carrying flexible grid tag information is classified according to the identifier of the wavelength channel, and the frequency range of the wavelength channel is determined according to the classified subcarrier information, and further
- the technical means for allocating spectrum resources to other wavelength channels therefore, fundamentally avoids the problem that the channel range caused by the flexible grid channel subcarrier continuous problem is not easy to determine.
- step S106 when determining the frequency range of the wavelength channel, it can be divided into two cases: In the first case, when the subcarrier frequency in the wavelength channel corresponding to the identifier is discontinuous, according to the center frequency of each subcarrier in the wavelength channel The frequency range is determined by the bandwidth of each subcarrier. In the second case, when the subcarrier frequencies in the wavelength channel corresponding to the identifier are continuous, the frequency range is determined according to the center frequency of the wavelength channel and the bandwidth of the wavelength channel.
- the method for obtaining the foregoing identifier may be multiple, for example, may be configured locally, and may be obtained by: obtaining the identifier from a data frame used to send the flexible grid label information, where The data frame carries the above identifier.
- the encapsulation process of the foregoing data frame is as follows: adding a frame header and a frame body respectively for the wavelength label information, where the frame header includes a frame positioning overhead, a frame ID, a frame length, and an extension field, and the frame body includes a wavelength source address and a wavelength. Head Address, channel number, whether the subcarrier is continuous, the channel center frequency, the channel bandwidth, the number of subcarriers, the subcarrier center frequency, the subcarrier bandwidth, the extension field, and the frame check bit are encapsulated into frames, where each wavelength
- the tag information frame carries information for one channel (wavelength channel), each channel may contain one or more subcarriers, and the subcarriers may be discontinuous.
- the data frame further carries the following information: a nominal center frequency of the wavelength channel, a location identifier of each subcarrier center frequency in the frequency spectrum, and a number of bandwidth granularities.
- the application process of the above three types of information may be expressed as follows: The determination of the channel range is divided into two cases: one case is when the channel is continuous, and in this case, the frequency of each subcarrier in the channel is continuous. Therefore, the channel range and position are determined by the nominal center frequency of the channel and the bandwidth of the channel.
- the nominal center frequency of the channel is calculated as 193.1THz+nx0.00625THz, n is an integer (may be negative), and the channel bandwidth calculation formula Is 12.5 GHz X m, where m is a positive integer.
- the channel is not continuous.
- the channel range and position are determined by the nominal center frequency of each subcarrier in the channel and the bandwidth of each subcarrier.
- the bandwidth calculation formula is the same as the nominal center frequency of the channel and the bandwidth calculation formula of the channel, except that the values of n, m (n, m both represent the number of bandwidth granularities) may be inconsistent, and the range of each subcarrier is added to be the channel.
- the range, the nominal center frequency of each subcarrier also determines the location of the channel.
- a device for distributing a spectrum resource based on a flexible grid label is provided.
- the device is used to implement the foregoing embodiment and a preferred embodiment, and details are not described herein.
- the module to be explained.
- the term "module" may implement a combination of software and/or hardware of a predetermined function.
- the apparatus described in the following embodiments is preferably implemented in software, hardware, or a combination of software and hardware, is also possible and conceivable.
- 2 is a structural block diagram of a flexible grid tag based spectrum resource allocation apparatus according to Embodiment 1 of the present invention. As shown in FIG.
- the apparatus includes: an obtaining module 20, connected to the classification module 22, configured to acquire an identifier of a wavelength channel for transmitting flexible grid label information; and a classification module 22 connected to the determining module 24, configured to follow
- the identifier is used to classify each subcarrier for carrying the flexible grid label information.
- the determining module 24 is connected to the allocation module 26, and is configured to determine the wavelength according to the classified subcarrier information in the wavelength channel corresponding to the identifier.
- the frequency range of the channel; the allocation module 26 is configured to allocate spectrum resources according to the frequency range other wavelength channels than the wavelength channel, wherein the wavelength channel and the other wavelength channels are used together to transmit the flexible grid tag information.
- the determining module 24 is configured to determine a frequency range according to a center frequency of each subcarrier in the wavelength channel and a bandwidth of each subcarrier when the subcarrier frequency in the wavelength channel corresponding to the identifier is discontinuous. In this embodiment, the determining module 24 may be further configured to determine a frequency range according to a center frequency of the wavelength channel and a bandwidth of the wavelength channel when the subcarrier frequencies in the wavelength channel corresponding to the identifier are consecutive.
- the obtaining module 20 is configured to obtain an identifier from a data frame for transmitting flexible grid label information, where the data frame carries an identifier.
- the acquiring module 22 obtains the identifier: the nominal center frequency of the wavelength channel, the location identifier of each subcarrier center frequency in the spectrum, and the number of bandwidth granularities.
- the main purpose of this embodiment is to provide a flexible grid wavelength label definition scheme, which effectively supports the implementation of the Flex Roadm in the wavelength division multiplexing system, supports the carrying of flexible raster subcarrier information, and supports channel information. Carrying, solving the problem of discontinuity of flexible grid channel subcarriers, supporting wavelength path monitoring and automatic discovery, and timely detecting the reception error of wavelength tags.
- the data frame structure is composed of a frame header and a frame body, the frame header is a fixed length, the frame body is a variable length, and the frame body length is related to the actual number of subcarriers.
- the channel center frequency and the channel bandwidth may be set to 0.
- the frame header includes, but is not limited to, frame positioning overhead, frame ID, frame length, and extended field.
- the frame locating overhead is used to define the starting position of the frame.
- the character sequence of 0xF6F6F6282828 can be consistent with the frame positioning overhead of the Optical Transport Network (OTN).
- OTN Optical Transport Network
- Other character sequences can also be used to guarantee the sequence of characters. It does not appear in the subsequently encoded frame data, so the start of a wavelength label information frame can be identified by this special sequence.
- the frame ID is a number of the data frame, and may be a number of 1, 2, 3, etc., or may be a number of other forms.
- the frame length is used to indicate the length of the data frame body.
- the frame body includes but is not limited to the wavelength source address, the wavelength destination address, the channel number, whether the subcarrier is continuous, the channel center frequency, the channel bandwidth, the number of channel subcarriers, the subcarrier center frequency, each subcarrier bandwidth, and the extension field.
- the Cyclic Redundancy Check (CRC) is composed of, but not limited to, these fields.
- the wavelength source address indicates the source node address of the wavelength, which may be an IP address, or may be a number such as 1, 2, 3... or a Medium Access Control (MAC) address. Or according to other address methods needed.
- MAC Medium Access Control
- the wavelength destination address indicates the destination address of the destination of the wavelength, which may be an IP address, or a number such as 1, 2, 3..., or a MAC (Medium/Media Access Control) address, or other address as needed.
- the channel number indicates the number of each channel, which can be represented by 1, 2...i, or can be expressed in other ways.
- Each subcarrier can be classified by channel number by channel number, thus solving the subcarrier frequency range is discontinuous. problem. Whether the subcarriers continuously indicate whether the carrier in the current channel number is continuous, can be continuous with 1, 0 is discontinuous, if continuous, the channel center frequency and channel bandwidth can be used to indicate the channel range. If it is not continuous, only the current range can be used.
- the center frequency of each subcarrier in the channel and the bandwidth of each subcarrier indicate the channel range.
- the channel center frequency and channel bandwidth are valid when the subcarriers are continuous.
- the nominal center frequency of the current channel is represented by the formula: 193.1THz+nx0.00625THz, n is an integer (may be negative); channel bandwidth It is 12.5 GHz X m, where m is a positive integer; the channel center frequency and channel bandwidth can take a value of 0 when the subcarriers are not continuous.
- the number of subcarriers is used to indicate the number of subcarriers in the channel. Each channel may have one or more subcarrier information.
- the number of subcarriers in the channel indicates that there are i subcarriers in the channel.
- the subcarrier center frequency represents the nominal center frequency of the current subcarrier, and the calculation formula is 193.1THz+nx0.00625THz, where n is an integer; the subcarrier bandwidth is 12.5 GHz xm, where m is a positive integer.
- Extended field used for frame expansion, this field is optional, regardless of extension.
- CRC cyclic redundancy check which realizes simple cyclic redundancy check of data frames, and other error detection/correction methods, such as Forward Error Correction (FEC), etc., if not considered This field is optional.
- FEC Forward Error Correction
- the wavelength label transmission method of this embodiment includes the following steps: Step S402: Encapsulate a wavelength label information frame.
- Step S402 Encapsulate a wavelength label information frame.
- first framing At the wavelength label transmitting end, first framing, generating a frame header and a frame body of the data frame according to the format of FIG. 3, and generating data frame fields according to rules.
- the frame positioning overhead, the frame ID, the frame length, and the extension field of the frame header are sequentially generated, and are not limited to generating these fields.
- the frame positioning overhead is represented by a character sequence of 0xF6F6F6282828 in this embodiment. Other special character sequences may also be used to ensure that the character sequence does not appear in the subsequently encoded frame data, so that a special sequence can be used to identify a wavelength label information frame. Start.
- the frame ID is numbered by 1, 2, 3, i, etc. in this embodiment, and may be other numbers.
- the frame length may be reserved before the frame body is generated. After the frame body is generated, the frame length is counted, and then the length value is filled.
- the length unit may be represented by a byte.
- the extended field can be reserved for the length of the byte before it is used.
- the wavelength source address, the wavelength destination address, the channel number, the subcarrier continuity, the channel center frequency, and the channel bandwidth of the frame body are generated.
- the source address of the wavelength indicates the source node address of the wavelength. In this embodiment, it is represented by a number such as 1, 2, 3, i, etc., and may be an IP address or a MAC address, and the like.
- the wavelength destination address indicates the destination node address to which the wavelength arrives. In this embodiment, it is represented by a number such as 1, 2, 3, etc., and may be an IP address or a MAC address, and the like.
- the channel number indicates the number of the channel. It is represented by numbers such as 1, 2, 3, etc. in this embodiment. It can also be expressed in other ways.
- Each subcarrier can be classified by channel number by channel number, thus solving the subcarrier.
- the problem of discontinuous frequency range Whether the subcarriers continuously indicate whether the carrier is continuous in the current channel number. In this embodiment, 1 is continuous, 0 is discontinuous, and other representation methods can be used. If continuous, the channel center frequency and channel bandwidth can be used.
- the channel range can only be represented by the center frequency of each subcarrier in the channel and the bandwidth of each subcarrier.
- the channel center frequency and channel bandwidth are valid when the subcarriers are continuous.
- the nominal center frequency of the current channel is represented by the formula: 193.1THz+nx0.00625THz, n is an integer (may be negative); channel bandwidth Is 12.5 GHz X m, where m is a positive integer; when the subcarriers are discontinuous, the channel center frequency and channel bandwidth can take a value of 0. Then generate the number of channel subcarriers, subcarrier center frequency, bandwidth, extension field, etc. .
- the number of subcarriers is used to indicate the number of subcarriers in the channel, and there may be one or more subcarrier information in each channel.
- the subcarrier center frequency represents the nominal center frequency of the current subcarrier, and the calculation formula is
- Step S404 encoding the wavelength label information frame.
- the encoding is performed according to the encoding rule, and the data frame can be encoded by the 4B/5B encoding method, and other encoding methods such as 8B/10B, scrambling can also be used. Codes, etc., regardless of which encoding method is used, this encoding method must be satisfied to be decodable. Step S406, determining a modulation frequency according to the wavelength channel.
- Step S408 loading the wavelength label information frame signal onto the optical channel.
- Use the modulated low frequency perturbation signal to control the wavelength tag loading device, such as a dimmable attenuator, to load the low frequency perturbation signal to the appropriate modulation depth (3% to 8%, either empirically or by simulation) Corresponding wavelength channel, and send.
- Step S410 splitting, photoelectrically converting, amplifying, and sampling the received optical signal.
- the received optical signal is split by a coupler, and a small portion (such as 5%) of the optical signal is taken out, sent to the PIN receiver for photoelectric conversion, then amplified and sampled and Analog to digital conversion.
- Step S412 performing frequency analysis on the converted optical signal.
- Step S414 decoding the parsed bit information. Find the special bit sequence corresponding to the frame header in the bit information obtained after the spectrum analysis, such as 0xF6F6F6282828 here, and then decode the frame data after the frame header; if the sender uses 4B/5B encoded data, here The decoding process is performed with the corresponding 4B/5B decoding rule.
- Step S416 recovering the wavelength label information frame.
- the decoded information is framing and verified.
- the frame check is performed by the CRC check rule. If the frame data passes the CRC check, the frame header and the frame body are generated. The frame header is generated first, and information such as frame positioning overhead, frame ID, frame length, and extended field is extracted in turn.
- the frame body is generated, and the wavelength source address, the wavelength destination address, the channel number, the subcarrier continuity, the channel center frequency, the channel bandwidth, the number of channel subcarriers, the center frequency of each subcarrier, the subcarrier bandwidth, and the extension are sequentially extracted.
- Valid information for fields such as fields and CRC checksums.
- the information is extracted in the form of address offset, extracted in byte order, and each field is extracted to form a corresponding frame field until all fields are framed. Otherwise, the CRC check error is reported and the error frame is discarded. If the sender uses FEC check, the receiver also checks with FEC. As shown in FIG.
- the wavelength label transmission apparatus of this embodiment includes: a packaging unit 50, an encoding unit 52, a frequency generating unit 54, a modulating unit 56, and a loading unit 58; wherein: a packaging unit 50 is connected to the encoding unit 52, and is configured To encapsulate the wavelength label information into a wavelength label information frame, the encapsulating unit 52 adds a frame header and a check to form a wavelength label information frame for the wavelength label information to be sent, and the frame check in this example uses a CRC check. Other error detection/correction methods such as FEC may also be employed.
- the wavelength label information frame data includes: wavelength signal source address information necessary for wavelength tracking and wavelength path discovery; carrying of information such as channel number, number of subcarriers, subcarrier center frequency and bandwidth, and solving flexible grid optical transmission
- the discontinuity of subcarriers in the channel leads to a problem of poorly determined channel range, and solves the problem of acquiring the center frequency and bandwidth of any subcarrier transmitted, and it is more convenient and accurate to locate the channel number and subcarriers in the flexible grid network.
- Carrying the center frequency and bandwidth information of each subcarrier in each channel is more convenient for obtaining subcarrier information.
- the corresponding extended information may also be added to the data of the wavelength label information frame as needed, such as time information for transmission and reception, network link information, and the like.
- Encoding unit 52 coupled to modulation unit 56, is arranged to encode the wavelength label information.
- the encoding unit 52 encodes the frame content of the wavelength label information frame except the frame header.
- the 4B/5B encoding is used, and the data frame can be encoded by using the 4B/5B encoding method, and other encoding methods can also be used as needed. 8B/10B, scrambling code, etc., regardless of which encoding method is used, this encoding method is decodable.
- the frame header adopts the OTN frame positioning mode 0xF6F6F6282828, which is an illegal codeword in the 4B5B encoding, and therefore does not appear in the encoded frame data.
- This step is optional, as is the case with better wavelength channel performance.
- this step can be skipped and the wavelength unit label information frame is directly modulated by the modulation unit 304 onto the corresponding low frequency perturbation frequency.
- the frequency generating unit 54 is connected to the modulating unit 56 and is configured to generate a low frequency perturbation frequency corresponding to the wavelength channel of the wavelength label information frame.
- the frequency generating unit 56 first determines the corresponding low frequency perturbation frequency based on the wavelength information of the wavelength signal, and then controls the digital frequency synthesizer to generate the low frequency.
- the modulating unit 56 is configured to modulate the wavelength label information frame to the low frequency perturbation frequency, and modulate the encoded or uncoded wavelength label information frame signal into a low frequency perturbation frequency by using an amplitude modulation manner.
- the loading unit 58 is configured to load the modulated wavelength label information frame signal into the wavelength channel for transmission, load the modulated signal onto the wavelength channel signal at a suitable modulation depth, and control the stability of the modulation depth.
- the loading unit 58 can be implemented by controlling a device such as a dimmable attenuator with a modulation signal.
- a low frequency perturbation frequency carrying the wavelength label information frame needs to be separately set for each wavelength channel.
- the above device shown in Fig. 5 is mainly used for the transmitting end of the optical network.
- FIG. 5 can be understood with reference to the related description of the aforementioned wavelength label transmission method.
- the functions of the various processing units in the wavelength label transmission device shown in FIG. 5 may be implemented by a program running on a processor, or may be implemented by a specific logic circuit (for example, a processor).
- 6 is a schematic structural diagram of another wavelength label transmission apparatus according to an embodiment of the present invention. As shown in FIG.
- the wavelength label transmission apparatus of this example includes a beam splitting unit 60, a processing unit 62, a spectrum analyzing unit 64, a decoding unit 66, and a framing unit 68; wherein: the light splitting unit 60 is connected to the processing unit 62 and configured to split the received optical signal; the light splitting unit 60 is composed of a fiber coupler, which takes 5% of the optical power for the wavelength label; the detecting unit 62 is connected to the spectrum analyzing unit 64, and is configured to perform photoelectric conversion and analog-to-digital conversion on one of the optical signals (such as 5% of the entire optical signal); the processing unit 62 includes a PIN for implementing photoelectric conversion. Tubes, amplifiers and analog-to-digital converters (ADCs), etc.
- ADCs analog-to-digital converters
- the spectrum analysis unit 64 reads the output signal of the ADC in the processing unit 62, and performs spectral analysis using a chirped Z-transformation to obtain a frequency value and a frequency signal amplitude information of the low-frequency perturbation frequency present in the signal, and recovers the low frequency.
- the wavelength information corresponding to the frequency of the perturbation frequency and the code stream information thereon; the decoding unit 66 is connected to the framing unit 68, and is configured to decode the bit information and decode the bit information.
- decoding unit 66 When decoding unit 66 decodes, it first looks for a frame header in the code stream signal. In this example, the frame header is 0xF6F6F6282828, and then the frame data following the frame header is 4B/5B decoded. At the time of decoding, if a codeword is not in the coding table of 4B/5B, that is, when a code error occurs, the frame data is lost, and a decoding error is reported.
- the decoding unit 66 in this example is not a necessary technical feature of the implementation scheme. In the case where the sender does not encode the wavelength label information frame, it is not necessary to decode the demodulated bit information.
- the framing unit 68 is configured to obtain the wavelength label information frame from the bit information group frame, and obtain the wavelength label information from the wavelength label information frame.
- the decoded data is framing
- the 4B/5B decoded data is composed into one frame
- the CRC check is performed, and if there is an error, the CRC check error is reported. . If no error is found, the wavelength source address, the wavelength destination address, the channel number, the subcarrier continuity, the channel center frequency, the channel bandwidth, the number of channel subcarriers, the center frequency of each subcarrier, and each subcarrier in the frame data. The bandwidth, number of subcarriers, frame length, extended field, etc. are extracted.
- the wavelength source address is used for source address identification and other applications of the wavelength signal; the wavelength destination address is used for destination address identification of the wavelength signal and other applications; the channel number is used to record the number of each channel, and the corresponding subcarrier can be known by the channel number.
- the number of channel subcarriers is used to indicate the number of subcarriers in the channel, and there may be one or more subcarrier information in each channel; whether the subcarriers are consecutive fields are used to indicate whether the subcarriers in the channel are continuous; the channel center frequency and channel frequency The value of the nominal center frequency and the bandwidth of the channel is obtained in the case of continuous subcarriers; the number of subcarriers in the channel is obtained by the number of subcarriers of the channel; and the center frequency of each subcarrier of each channel is obtained by the center frequency of the subcarrier; The subcarrier bandwidth is used to obtain the bandwidth of each subcarrier of each channel; Finally, other information such as wavelength information, address information, and flexible raster information contained in the wavelength label is recovered at the receiving end.
- the wavelength label transmission device shown in Fig. 6 is mainly used for the receiving end of the optical network.
- the implementation functions of the respective processing units in the wavelength label transmission device shown in FIG. 6 can be understood with reference to the related description of the aforementioned wavelength label transmission method.
- the functions of the processing units in the wavelength label transmission device shown in FIG. 6 can be realized by a program running on the processor, or can be realized by a specific logic circuit.
- FIG. 7 in a fixed grid network, the interval of adjacent channels carrying wavelengths of different rate services is fixed at 50 GHz, and each wavelength is allocated a fixed 50 GHz optical spectrum bandwidth resource. For a flexible grid optical network, you can allocate more spectrum bandwidth resources for high-speed services according to actual conditions.
- the bandwidth utilization rate of the network will be greatly increased.
- the spectral width of one channel can be 12.5G, 25G, 50G, 100GHz, etc., and the number of subcarriers per channel may not be continuous, as shown in channel 3 in Figure 7, so in a flexible grid network,
- the channel center frequency and bandwidth can be used to represent the channel range.
- the channel center frequency and channel bandwidth cannot be used to determine the channel carrier information.
- the method is: applying a subcarrier center frequency and a subcarrier bandwidth to determine carrier information.
- the modulation of the wavelength label signal can be completed by using less low frequency perturbation modulation frequency, and the wavelength signal source can be transmitted through the data frame carried on the wavelength label.
- the address, the channel number of the subcarrier, the channel center frequency, the channel bandwidth, the number of subcarriers, the subcarrier center frequency and the bandwidth, etc. solve the problem that the subcarrier discontinuity in the flexible grid optical transmission channel leads to poorly determined channel range. problem.
- software is also provided for performing the technical solutions described in the above embodiments and preferred embodiments.
- a storage medium is provided, the software being stored, including but not limited to: an optical disk, a floppy disk, a hard disk, a rewritable memory, and the like.
- the above modules or steps of the present invention can be implemented by a general-purpose computing device, which can be concentrated on a single computing device or distributed over a network composed of multiple computing devices. Alternatively, they may be implemented by program code executable by the computing device, such that they may be stored in the storage device by the computing device and, in some cases, may be different from the order herein. Perform the steps shown or described, or separate them into individual integrated circuit modules, or Multiple of these modules or steps are fabricated as a single integrated circuit module.
- the invention is not limited to any specific combination of hardware and software.
- the above are only the preferred embodiments of the present invention, and are not intended to limit the present invention, and various modifications and changes can be made to the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and scope of the present invention are intended to be included within the scope of the present invention.
- INDUSTRIAL APPLICABILITY The above technical solution provided by the present invention can be applied to a spectrum resource allocation process based on a flexible grid tag, and classifies each subcarrier for carrying flexible grid tag information according to an identifier of a wavelength channel.
- the effective problem of the flexible grid channel subcarrier continuity problem has not been effectively solved yet.
- the resulting channel range is not easy to determine and other technical issues, thus enabling the transmission of information to flexible grid tags.
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EP13881788.7A EP2985943A4 (en) | 2013-04-07 | 2013-09-13 | Spectroscopic Assignment Method and Apparatus Based on a Flexible Grid Label |
JP2016505679A JP6140883B2 (ja) | 2013-04-07 | 2013-09-13 | 可変グリッドラベルに基づくスペクトルリソース割当て方法及び装置 |
KR1020157031430A KR102106663B1 (ko) | 2013-04-07 | 2013-09-13 | 플렉서블 그리드 라벨에 기반한 스펙트럼 자원 할당 방법 및 장치 |
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CN201310117917.5A CN104104489B (zh) | 2013-04-07 | 2013-04-07 | 基于灵活栅格标签的频谱资源分配方法及装置 |
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CN112636866A (zh) * | 2020-12-31 | 2021-04-09 | 武汉邮电科学研究院有限公司 | 一种波长标签生成方法和装置、以及检测方法和装置 |
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JP7317552B2 (ja) | 2019-04-05 | 2023-07-31 | 日本ルメンタム株式会社 | 光モジュール及び光通信システム |
CN111211860B (zh) * | 2019-12-30 | 2022-02-08 | 武汉邮电科学研究院有限公司 | 一种基于多载波技术的波长标签的传输方法及装置 |
CN112203165B (zh) * | 2020-09-07 | 2022-04-12 | 烽火通信科技股份有限公司 | 一种otn中实现灵活栅格业务的方法及系统 |
CN117424674A (zh) * | 2022-07-11 | 2024-01-19 | 中兴通讯股份有限公司 | 多波长标签信号处理方法、控制器以及存储介质 |
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CN102195739B (zh) * | 2011-05-23 | 2015-08-12 | 中兴通讯股份有限公司 | 一种光标签的实现方法和系统 |
EP2571184B1 (en) * | 2011-09-16 | 2017-02-22 | Alcatel Lucent | Allocation of spectral capacity in a wavelength-division multiplexing optical network |
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CN102857837A (zh) * | 2011-06-30 | 2013-01-02 | 中兴通讯股份有限公司 | 灵活栅格光网络的波长标签编码方法、处理方法及节点 |
US20130045006A1 (en) * | 2011-08-01 | 2013-02-21 | Eci Telecom Ltd. | Method and a network node for improving bandwidth efficiency in an optical network |
CN102820951A (zh) * | 2012-07-30 | 2012-12-12 | 华为技术有限公司 | 光传送网中传送、接收客户信号的方法和装置 |
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CN112636866B (zh) * | 2020-12-31 | 2023-12-15 | 武汉邮电科学研究院有限公司 | 一种波长标签生成方法和装置、以及检测方法和装置 |
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EP2985943A4 (en) | 2016-04-20 |
JP2016522599A (ja) | 2016-07-28 |
CN104104489A (zh) | 2014-10-15 |
CN104104489B (zh) | 2018-11-09 |
JP6140883B2 (ja) | 2017-06-07 |
KR20150140721A (ko) | 2015-12-16 |
EP2985943A1 (en) | 2016-02-17 |
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