CN112532336A - Ultra-dense wavelength division multiplexing coherent light access system - Google Patents
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- 230000003287 optical effect Effects 0.000 claims abstract description 114
- 238000005516 engineering process Methods 0.000 claims abstract description 10
- 239000013307 optical fiber Substances 0.000 claims abstract description 8
- 230000010355 oscillation Effects 0.000 claims abstract description 8
- 230000035559 beat frequency Effects 0.000 claims abstract description 4
- 238000010009 beating Methods 0.000 claims abstract 2
- 210000001520 comb Anatomy 0.000 claims description 6
- 238000003780 insertion Methods 0.000 claims description 3
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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
- H04J14/0228—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths
- H04J14/023—Wavelength allocation for communications one-to-all, e.g. broadcasting wavelengths in WDM passive optical networks [WDM-PON]
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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
- H04J14/0241—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths
- H04J14/0242—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON
- H04J14/0245—Wavelength allocation for communications one-to-one, e.g. unicasting wavelengths in WDM-PON for downstream transmission, e.g. optical line terminal [OLT] to ONU
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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
- H04J14/0261—Optical medium access at the optical multiplex section layer
- H04J14/0263—Multiplex section layer wavelength assignment algorithms
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Abstract
The invention relates to an ultra-dense wavelength division multiplexing coherent light access system, which consists of an OLT, a Remote Node and an ONU. Wherein the remote node is formed by a 1: N splitter. The downlink direction is as follows: the OLT generates N paths of intrinsic optical signals through a laser and an optical frequency comb, and realizes ultra-dense wavelength division multiplexing signal optical signals with N wavelengths of a single optical fiber through IQ modulation and AWG; n wavelength signals at a Remote Node are distributed to ONU through a 1: N optical splitter; on the ONU side, a part of uplink optical signals are coupled out to be used as local oscillation light for downlink coherent reception, and beat frequency is carried out to generate corresponding wavelength signals; an uplink direction: the laser of each ONU is tuned to a different wavelength; n ONU is coupled by a 1: N optical splitter and then is merged into a single optical fiber; and the OLT side generates corresponding receiving signals by beating the N wavelength signals through the intrinsic optical signals through a coherent technology.
Description
Technical Field
The invention relates to the technical field of optical access networks, in particular to an ultra-dense wavelength division multiplexing coherent optical access system.
Background
With the increasing popularity of networks and the rapid development of emerging high bandwidth services, such as 4K and 8K video services, user bandwidth demand is growing rapidly. TDM-PON (time division multiplexing-passive optical network) has been advanced from 1Gbps/2.5Gbps rate, which has been widely deployed before, to 10Gbps rate, and a TWDM-PON (time division multiplexing-passive optical network) hybrid multiplexing technology has emerged: i.e. multiple groups of wavelengths are used simultaneously, one TDM domain being deployed on each group of wavelengths. However, these technologies still cannot meet the increasing bandwidth demand, and cannot reach the bandwidth demand of 10Gbps per household. Therefore, various WDM-PON (wavelength division multiplexing-passive optical network) are researched in the industry, an independent wavelength can be provided for each user by adopting the technology, each bandwidth can reach at least 10Gbps, and the requirement of 5-10 years in the future can be met.
A conventional WDM-PON is shown in fig. 1. The Remote Node of fig. 1 uses an AWG (Array Waveguide Grating) with only one wavelength on each branch. The Remote Node in fig. 1 may use POS (Passive Optical splitter) power allocation instead of AWG wavelength allocation, however, the conventional WDM-PON Optical power budget is small, and although the introduced Optical splitter may be used, the insertion loss is too large, resulting in that the Optical power of the subscriber terminal is lower than the sensitivity of the receiver. It is known that operators have invested a lot in the ODN (optical distribution network) infrastructure field, accounting for 30% -60% of the total investment of optical access networks, and the invested ODN infrastructure deploys POS instead of AWG. For operators to deploy new technologies, one must try to make use of ODN infrastructure that has been invested before. This puts the conventional WDM-PON into a dilemma: or AWG is used, but the old problem of the existing ODN cannot be solved; or POS is used but the optical power budget problem cannot be solved.
Therefore, the prior art has problems and needs to be further developed.
Disclosure of Invention
The invention provides an ultra-dense wavelength division multiplexing coherent optical access system aiming at the defects of the traditional WDM-PON technology. The optical power budget of the system can be greatly improved after the coherent technology is introduced, so that ODN infrastructures widely deployed in the existing network can be reused.
In order to achieve the purpose, the specific technical scheme of the invention is as follows:
a super-dense wavelength division multiplexing coherent light access system is composed of an optical line terminal OLT, a Remote Node and an optical network unit ONU, wherein the Remote Node is composed of an optical splitter;
the downlink direction is as follows: the OLT generates 32 paths of intrinsic optical signals through a laser and an optical frequency comb, and realizes ultra-dense wavelength division multiplexing signal optical signals of 32 wavelengths of a single optical fiber through IQ modulation and AWG; 32 wavelength signals at a Remote Node are distributed to the ONU through a 1:32 optical splitter; on the ONU side, a part of uplink optical signals are coupled out to be used as local oscillation light for downlink coherent reception, and beat frequency is carried out to generate corresponding wavelength signals;
an uplink direction: the laser of each ONU is tuned to a different wavelength; the 32 ONUs are coupled by a 1:32 optical splitter and then are merged into a single optical fiber; the OLT side beats the 32 wavelength signals through intrinsic optical signals (generated by a downlink laser and an optical frequency comb) by a coherent technology to generate corresponding receiving signals.
According to the scheme, the OLT consists of a sending end OLT Tx, a receiving end OLT Rx and a circulator; at a sending end OLT Tx, a seed source laser generates 32 wavelengths after optical frequency combing, light of each wavelength is divided into a part by an optical splitter to be output as local oscillation light of a receiving end OLT Rx, and the other part is converted into sent signal light after passing through an IQ modulator. Automatic locking of the modulator bias is achieved by a control circuit. The 32-channel high-speed electric signal input by the high-speed data input electric port carries out variable rate modulation on data according to the requirement of access service, and meanwhile, the signal can be selectively pre-compensated. The signal light output by the 32 IQ modulators passes through the AWG and then is used as the downstream signal light of the OLT. At a receiving end OLT Rx, input wavelength division multiplexing signal light is divided into 32 paths of optical signals after passing through an optical splitter, the optical signals and 32 corresponding local oscillator light input by the OLT Tx enter a coherent receiving module together, after electric signals after coherent receiving are input into an FPGA, a low-complexity self-adaptive equalization algorithm is executed, and then recovery signals are output through a high-speed data output port.
According to the scheme, the ONU consists of a coherent receiver, a tunable laser, a CPU/MAC, a 1:2 optical splitter, an optical switch and a circulator. The tunable laser uses a direct modulation laser for reducing cost, and output light of the direct modulation laser is divided and simultaneously used as local oscillation light for coherent detection. The intrinsic light and the input optical signal are beaten and processed to generate the required downlink electrical signal. Particularly, in order to cooperate with a wavelength control algorithm, an optical switch is added in the uplink output optical direction of the tunable laser, so that the situation that a plurality of ONUs send out the same wavelength laser to generate collision is avoided.
The optical splitter at the 1:32 remote node is only an example, and may be changed to 1: N (N is a positive natural number greater than or equal to 2, the value of N is not limited to the power m of 2, and m is a natural number greater than or equal to 1) according to the service requirement, and the optical comb at the transmitting end of the OLT and the optical splitter at the receiving end of the OLT may also be changed to N optical combs and 1: N optical splitters according to the service requirement. It should be noted that if the splitting ratio of the optical splitter at the receiving end of the OLT is too large and thus the insertion loss is too large, resulting in insufficient optical power budget of the link, the AWG and the optical splitter with low splitting ratio may be used instead of the optical splitter with high splitting ratio, for example, the 1:32 optical splitter may be replaced with the AWG with 1:4 and four optical splitters with 1: 8.
In the present invention, in order to further increase the carrying capacity of a single fiber, multiple sets of seed laser light sources and optical frequency combs can be adopted, and the generated wavelengths can be further increased in the capacity of the system by AWG multiplexing and coupling, which is specifically described in the detailed description of the embodiments.
Compared with the prior art, the invention has the following beneficial effects:
(1) ODN infrastructure already deployed by an operator can be recycled to the maximum extent, so that investment is protected;
(2) the optical power budget of the link is greatly improved and can be increased by more than 10 dB;
(3) supporting access of X × Y × N users (X is the number of OLT Tx/Rx packets, Y is the number of seed light sources/optical frequency combs in each group, X × Y is the number of remote node AWG branch ratios, N is the number of splitter POS branch ratios, if X is 5, Y is 2, and N is 32, then 320 users are supported), and the access bandwidth of each user can reach at least 10 Gbps;
(4) the ONU wavelength tunable ranges under the single branch of the AWG of the remote node are the same (namely colorless), so that high engineering installation and maintenance cost caused by different large ONU wavelength tunable ranges or the use of specific wavelength (namely colored) can be avoided;
(5) the invention has no relation with specific data format and speed (i.e. transparent), and can be upgraded or expanded conveniently.
Drawings
FIG. 1 is a conventional WDM-PON architecture;
FIG. 2 is an architectural diagram of embodiment 1 of the present invention;
fig. 3 is a 32-channel wavelength division multiplexing coherent optical access system in embodiment 1 of the present invention;
fig. 4 is a transmitting end of an OLT in a 32-channel wdm coherent optical access system in embodiment 1 of the present invention;
fig. 5 is a receiving end of an OLT in a 32-channel wdm coherent optical access system in embodiment 1 of the present invention;
fig. 6 is a diagram of implementing a wdm-coherent optical access ONU in embodiment 1 of the present invention;
fig. 7 shows a 320-channel wavelength division multiplexing coherent optical access system in embodiment 2 of the present invention;
fig. 8 is a group 1 of the transmitting end of an OLT in a 320-channel wavelength division multiplexing coherent optical access system in embodiment 2 of the present invention;
fig. 9 shows a group 1 at the receiving end of an OLT of a 320-channel wavelength division multiplexing coherent optical access system in embodiment 2 of the present invention.
Detailed Description
In order that those skilled in the art can understand and implement the present invention, the following embodiments of the present invention will be further described with reference to the accompanying drawings.
Referring to fig. 2 to 6, the core idea of the ultra-dense wave-phase coherent access system according to the present invention is: the OLT generates 32 paths of intrinsic optical signals through a laser and an optical frequency comb, and realizes ultra-dense wavelength division multiplexing signal optical signals of 32 wavelengths of a single optical fiber through IQ modulation and AWG; 32 wavelength signals at a Remote Node are distributed to the ONU through a 1:32 optical splitter; and on the ONU side, a part of the uplink optical signal is coupled out to be used as local oscillation light for downlink coherent reception, and the beat frequency generates a corresponding wavelength signal. An uplink direction: the laser of each ONU is tuned to a different wavelength; the 32 ONUs are coupled by a 1:32 optical splitter and then are merged into a single optical fiber; the OLT side beats the 32 wavelength signals through intrinsic optical signals (generated by a downlink laser and an optical frequency comb) by a coherent technology to generate corresponding receiving signals. The light in the up and down directions is directionally separated and combined by the circulator.
Referring to fig. 2, 4 and 5, the OLT is composed of a transmitting end (OLT Tx) and a receiving end (OLT Rx) and a circulator. Referring to fig. 4, at a transmitting end of the OLT, the seed source laser generates 32 wavelengths through optical frequency combing, light of each wavelength is split by the optical splitter into a part which is output as local oscillation light at a receiving end of the OLT, and the other part passes through the IQ modulator and becomes transmitted signal light. Automatic locking of the modulator bias is achieved by a control circuit. The 32-channel high-speed electric signal input by the high-speed data input electric port carries out variable rate modulation on data according to the requirement of access service, and meanwhile, the signal can be selectively pre-compensated. The signal light output by the 32 IQ modulators passes through the AWG and then is used as the downstream signal light of the OLT. Referring to fig. 5, at the receiving end of the OLT, the input wavelength division multiplexing signal light is divided into 32 optical signals after passing through one optical splitter, the optical signals enter the coherent receiving module together with the input 32 corresponding local oscillator lights, after the coherent received electrical signals are input into the FPGA, the recovery signals are output through the high-speed data output port after the low-complexity adaptive equalization algorithm is executed.
Referring to fig. 6, the ONU is composed of a coherent receiver, a tunable laser, a CPU/MAC, a 1:2 optical splitter, an optical switch, and a circulator. The tunable laser uses a direct modulation laser for reducing cost, and output light of the direct modulation laser is divided and simultaneously used as local oscillation light for coherent detection. The intrinsic light and the input optical signal are beaten and processed to generate the required downlink electrical signal. In particular, in order to cooperate with a wavelength control algorithm, an optical switch is added in the uplink output optical direction of the tunable laser, so that the situation that a plurality of ONUs send out the same wavelength laser to generate conflict is avoided.
In order to further increase the carrying capacity of a single fiber, a plurality of groups of seed laser light sources and optical frequency combs can be adopted, and the capacity of the system can be further increased after the generated wavelengths are combined and coupled by the AWG. The coherent light access system can be expanded, the transmitting end OLT Tx and the receiving end OLT Rx can be expanded into X groups, each group of transmitting end can be expanded to comprise Y seed lasers, Y optical frequency combs and 2 AWG, and each group of receiving end can be expanded to Y N coherent receiving modules. Accordingly, the configuration Remote Node is also extended from 1: N splitter to a 1: x Y of AWG cascades X Y1: n optical splitters, where X is a positive natural number, Y is a positive natural number greater than 2, generally, Y is 2 to the power of N, N is a natural number, and Y is 2 to the power of N, which can facilitate wavelength interleaving and add/drop multiplexing, so that the number of ONUs accessed by the entire system can be expanded to N X Y. Fig. 7 to 9 are expanded on the basis of the original design, and the original single-fiber unidirectional 32 wavelength is increased to the single-fiber unidirectional 320 wavelengths. The specific scheme is as follows:
the transmitting and receiving ends of the OLT are expanded into five groups, and five pairs of AWG are used. Two seed lasers are used in each group of transmitting ends, and 64 wavelengths are generated after passing through an optical frequency comb and an AWG, and the wavelengths are even and odd with 32 wavelengths. The odd and even wavelengths are modulated and then are interleaved by AWG wave combination and an optical splitter. The wavelength division multiplexing density of each group is improved by 2 times, and the multiplexing density and the capacity can be improved by 10 times by five groups. A 1:10 AWG is extended at the remote node and 10 1:32 splitters are cascaded to expand the branching ratio and to keep ODN infrastructure investment as much as possible. The ONU side is realized without expansion and is the same as the original design.
The above 1:32 to 1:320 extensions are merely examples and one skilled in the art may readily extend these extensions in light of the above description and illustrations.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (7)
1. A super-dense wavelength division multiplexing coherent optical access system is characterized in that the system consists of an optical line terminal OLT, a Remote Node and an optical network unit ONU, wherein the Remote Node consists of a 1: N optical splitter;
the downlink direction is as follows: the OLT generates N paths of intrinsic optical signals through a laser and an optical frequency comb, and realizes ultra-dense wavelength division multiplexing signal optical signals with N wavelengths of a single optical fiber through IQ modulation and AWG; n wavelength signals at a Remote Node are distributed to ONU through a 1: N optical splitter; on the ONU side, a part of uplink optical signals are coupled out to be used as local oscillation light for downlink coherent reception, and beat frequency is carried out to generate corresponding wavelength signals; an uplink direction: the laser of each ONU is tuned to a different wavelength; n ONU is coupled by a 1: N optical splitter and then is merged into a single optical fiber; the OLT side generates corresponding receiving signals by beating the N wavelength signals through the intrinsic optical signals through a coherent technology;
wherein N is a positive natural number of 2 or more.
2. The ultra-dense wavelength division multiplexing coherent optical access system according to claim 1, wherein the OLT is composed of a transmitting end OLT Tx and a receiving end OLT Rx and a circulator; at a sending end OLT Tx, a seed source laser generates N wavelengths after optical frequency combing, light of each wavelength is divided by an optical splitter into a part to be output as local oscillator light of a receiving end OLT Rx, and the other part passes through an IQ modulator to be sent signal light which is output from a signal light output interface after being subjected to AWG combination; at a receiving end OLT Rx, an input wavelength division multiplexing signal light is divided into N paths of optical signals after passing through an optical splitter, the optical signals and N corresponding local oscillator light input by the OLT Tx enter a coherent receiving module together, after an electric signal after coherent receiving is input into an FPGA, a low-complexity self-adaptive equalization algorithm is executed, and then a recovery signal is output through a high-speed data output port.
3. The ultra-dense wavelength division multiplexing coherent optical access system according to claim 1, wherein the ONU is composed of a coherent receiver, a tunable laser, a CPU/MAC, a 1:2 optical splitter, an optical switch, and a circulator.
4. The very dense wavelength division multiplexing coherent optical access system of claim 2, wherein at the OLT receiving end, when the splitter splitting ratio is too large and the insertion loss is too large, resulting in insufficient link optical power budget, the splitter with high splitting ratio can be replaced by a cascade of AWG and splitter with low splitting ratio.
5. The very dense wavelength division multiplexing coherent optical access system according to any one of claims 1 to 3, wherein N is 2 to the power m, and m is a positive natural number.
6. The ultra-dense wavelength division multiplexing coherent optical access system according to claims 1 to 3, wherein the coherent optical access system is expandable, the transmitting end OLT Tx and the receiving end OLT Rx are both expandable into X groups, each group of transmitting ends is expandable to include Y seed lasers, Y optical frequency combs, and 2 AWG, and each group of receiving ends is expandable to Y N coherent receiving modules; accordingly, the configuration Remote Node is also extended from 1: N splitter to a 1: x Y of AWG cascades X Y1: and N optical splitters, wherein X is a positive natural number, and Y is a positive natural number greater than 2, so that the number of the ONU accessed by the whole system can be expanded to N X Y.
7. The ultra-dense wavelength division multiplexing coherent optical access system according to claim 6, wherein Y is 2 to the n-th power, n is a natural number, and Y is 2 to the n-th power to facilitate wavelength interleaving and add/drop multiplexing.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114157389A (en) * | 2021-11-04 | 2022-03-08 | 江南大学 | UDWDM passive optical network system based on EML and optical transmission method |
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| CN104301811A (en) * | 2014-08-22 | 2015-01-21 | 武汉邮电科学研究院 | Coherent passive optical network system and signal transmitting and receiving method |
| CN109412742A (en) * | 2018-11-22 | 2019-03-01 | 华中科技大学 | Based on the seven core fibre ultra dense wavelength division multiples extremely relevant Fiber Access System of letter |
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Patent Citations (3)
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|---|---|---|---|---|
| US8320760B1 (en) * | 2011-11-03 | 2012-11-27 | Google Inc. | Passive optical network with asymmetric modulation scheme |
| CN104301811A (en) * | 2014-08-22 | 2015-01-21 | 武汉邮电科学研究院 | Coherent passive optical network system and signal transmitting and receiving method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114157389A (en) * | 2021-11-04 | 2022-03-08 | 江南大学 | UDWDM passive optical network system based on EML and optical transmission method |
| CN114157389B (en) * | 2021-11-04 | 2022-11-08 | 江南大学 | UDWDM passive optical network system based on EML and optical transmission method |
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