CN112511229B - Forward transmission network system and optical module - Google Patents
Forward transmission network system and optical module Download PDFInfo
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- CN112511229B CN112511229B CN201910872575.5A CN201910872575A CN112511229B CN 112511229 B CN112511229 B CN 112511229B CN 201910872575 A CN201910872575 A CN 201910872575A CN 112511229 B CN112511229 B CN 112511229B
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- H04—ELECTRIC COMMUNICATION TECHNIQUE
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- H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
- H04B10/40—Transceivers
Abstract
The invention discloses a forwarding network system and an optical module. Wherein, this fronthaul network system includes: a shared light source for generating a source light wave; the local side is connected with the shared light source and used for generating downlink transmission light waves by the source light waves and transmitting downlink information to a far end; and the remote end is connected with the local end and used for generating uplink transmission light waves by the downlink transmission light waves and transmitting uplink information to the local end. The source optical waves generated by the shared light source are only transmitted to the local side, the local side generates downlink transmission optical waves according to the source optical waves, and the far end generates uplink optical waves according to the received downlink transmission optical waves, so that the wavelength resource requirements of the shared light source can be effectively reduced, the optical path links between the shared light source and the far end are reduced, and the requirements of optical fiber resources can also be effectively reduced.
Description
Technical Field
The invention relates to the technical field of optical fiber communication, in particular to a fronthaul network system and an optical module.
Background
C-RAN (Cloud/Centralized Radio Access Network) at the central office end and the far end is an important evolution direction of the 5G Radio Access Network. Currently, the C-RAN is dominated by a small and medium concentration of 5-10 physical stations, which may need to be connected 10-30 in the future. If an optical fiber direct drive mode is adopted, 1 physical station is calculated according to 3 AAUs (Active Antenna units) and each AAU corresponds to 2 25G optical modules according to 160M frequency spectrum, 120 core optical fibers are needed for connecting 10 physical stations, and the consumption of optical fiber resources is huge. How to effectively reduce the requirement of optical fiber resources in a fronthaul network system is a technical problem to be solved urgently.
Disclosure of Invention
In view of this, embodiments of the present invention provide a forwarding network system, which aims to effectively reduce the requirement of the forwarding network system on optical fiber resources.
The technical scheme of the embodiment of the invention is realized as follows:
the embodiment of the invention provides a forwarding network system, which comprises:
a shared light source for generating a source light wave;
the local side is connected with the shared light source and used for generating downlink transmission light waves by the source light waves and transmitting downlink information to a far end;
and the remote end is connected with the local end and used for generating uplink transmission light waves by the downlink transmission light waves and transmitting uplink information to the local end.
An embodiment of the present invention further provides an optical module, where the optical module includes: the device comprises a transceiving port, a circulator, a light splitter, a detector and a modulator; wherein the content of the first and second substances,
the receiving and transmitting port is connected with the circulator and used for receiving downlink transmission light waves, transmitting the downlink transmission light waves to the circulator and receiving uplink transmission light waves output by the circulator;
the circulator is connected with the optical splitter and is used for transmitting the downlink transmission light waves to the optical splitter and transmitting the uplink transmission light waves to the transceiving port;
the optical splitter is connected with the detector and the modulator and is used for splitting the downlink transmission light wave into two paths, one path of the downlink transmission light wave is continuously transmitted to the detector as the downlink transmission light wave, and the other path of the downlink transmission light wave is transmitted to the modulator as the uplink transmission light wave;
the detector is used for acquiring downlink information carried in the downlink transmission light wave and transmitting the downlink information in a downlink manner;
and the modulator is connected with the circulator and is used for loading uplink information on the uplink transmission light wave and transmitting the uplink transmission light wave loaded with the uplink information to the circulator.
According to the technical scheme provided by the embodiment of the invention, the source optical wave generated by the shared light source is only transmitted to the local side, the local side generates the downlink transmission optical wave according to the source optical wave, and the remote side generates the uplink transmission optical wave according to the received downlink transmission optical wave, so that the wavelength resource requirement of the shared light source can be effectively reduced, the optical path links between the shared light source and the remote side are reduced, and the requirement of optical fiber resources can also be effectively reduced.
Drawings
Fig. 1 is a schematic structural diagram of a forwarding network system according to an embodiment of the present invention;
fig. 2 is a schematic structural diagram of a forwarding network system according to another embodiment of the present invention;
fig. 3 is a schematic structural diagram of a forwarding network system according to another embodiment of the present invention;
fig. 4 is a schematic structural diagram of an optical module according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of a forwarding network system according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
The passive wavelength division multiplexing technology carries out wavelength division multiplexing on multiple paths of optical signals with different wavelengths through a wave combiner, then the multiple paths of optical signals are synthesized into one path of signal to be transmitted in an optical fiber, the capacity expansion of a network can be realized by adopting a wavelength expansion mode, and the requirement of a forward transmission network on optical fiber resources is obviously reduced. Although the passive wavelength division multiplexing technology can alleviate the requirement of a network on optical fiber resources, both a RRU (Radio Remote Unit) and a BBU (Building base band Unit) need to be configured with color optical modules with fixed wavelengths, and the wavelengths of the RRU and BBU transceiver optical modules and wavelength division multiplexer/demultiplexer channels need to be strictly in one-to-one correspondence. If the wavelengths of the optical modules are not matched, engineering personnel are required to go to a site again and even climb a tower for processing, the more the wavelengths are, the higher the error probability is, the labor cost is obviously increased, and particularly for an area with severe natural conditions.
Compared with an optical module with a single wavelength, the color light module with a fixed wavelength also increases the number of spare parts and the cost. If a wavelength tunable optical module is adopted, the problems can be effectively solved. However, the wavelength tunable optical module employs a wavelength tunable laser, which is expensive, and the practicability of the fronthaul network needs to be enhanced, especially considering the more severe environmental requirements of the RRU side.
Although the broadband light source can reduce networking cost, the output power of the light source is low, and an optical amplifier is required to amplify the power to meet the incident power requirement of the wave-locked light source, so that the signal-to-noise ratio of the system is reduced, the transmission performance is deteriorated, and the wavelengths of all channels cannot be flexibly configured.
In addition, the speed of an RRU side optical module in the 5G fronthaul network is increased to 25Gb/s, the cost is further increased under the condition that the requirements of environment temperature, transmission distance and the like are met, and the networking application of the wavelength-fixed and wavelength-tunable optical modules is considered comprehensively.
The light source clouding method realizes that one public light source provides light sources for a plurality of BBUs and RRUs by establishing a light source pool, and the cost of the wavelength tunable optical module is shared. However, the shared light source is composed of an uplink laser array and a downlink laser array, and provides light sources for the RRU and the BBU respectively, and the uplink and the downlink between the RRU and the BBU correspond to different wavelengths respectively, so that the requirement on wavelength resources is high; the RRU side needs 2 core optical fibers and the optical module needs 2 optical ports, and the structure is complex.
Therefore, in various embodiments of the present invention, since the source optical wave generated by the shared light source is only transmitted to the office, the office generates the downlink transmission optical wave according to the source optical wave, and the remote generates the uplink transmission optical wave according to the received downlink transmission optical wave, the wavelength resource requirement of the shared light source can be effectively reduced, the optical path links between the shared light source and the remote are reduced, and the requirement of the optical fiber resource can also be effectively reduced.
An embodiment of the present invention provides a forwarding network system, as shown in fig. 1, the forwarding network system includes: the light source 101, the local side 102 and the remote side 103 are shared.
In the embodiment of the present invention, the shared light source 101 is used for generating a source light wave; the office 102 is connected to the shared light source 101, and configured to generate a downlink transmission light wave from the source light wave, and transmit downlink information to the remote 103; the remote end 103 is connected to the central office end 102, and configured to generate an uplink transmission light wave by using the downlink transmission light wave, and transmit uplink information to the central office end 102. Here, the central office 102 may be a BBU or a DU (distribution Unit), and the remote 103 may be an RRU or an AAU.
In the embodiment of the present invention, the office 102 may receive the source light wave generated by the shared light source without a laser to generate the downlink transmission light wave, and the remote 103 may also receive the downlink transmission light wave of the office 102 without a laser to generate the uplink transmission light wave. Because the source light wave generated by the shared light source 101 is only transmitted to the office 102, the office 102 generates the downlink transmission light wave according to the source light wave, and the remote 103 generates the uplink transmission light wave from the downlink transmission light wave received by the remote 103, the wavelength resource requirement of the shared light source can be effectively reduced, the optical path link between the shared light source 101 and the remote 103 is reduced, and the requirement of the optical fiber resource can also be effectively reduced.
In the embodiment of the present invention, the shared light source 101 uses a laser to output a high-quality source light wave. In an embodiment, the shared light source 101 is a wavelength tunable optical module, and the source optical wave includes two or more optical waves with different wavelengths, so that the shared light source 101 can provide optical waves with different wavelengths to two or more optical modules on the office 102, and the planning and maintenance difficulty of the fronthaul network system can be effectively reduced.
In one embodiment, the forwarding network system further includes: the optical splitter is connected with the shared light source and the local side, and is used for dividing the source light waves into M groups of same source light waves and providing the source light waves for at least two local sides; wherein M is a natural number greater than or equal to 2. Thus, the optical splitter can be used for multiplexing the source optical waves into M groups and providing the source optical waves for a plurality of local sides, so that the cost of the wavelength tunable optical module can be shared.
In one embodiment, the forwarding network system further includes: a combiner and a splitter. Wherein the content of the first and second substances,
the combiner is arranged between the shared light source and the optical splitter and is used for combining light waves with different wavelengths in the source light waves into a path of composite light wave for transmission; the optical splitter is used for splitting the composite light wave into M groups of same composite light waves;
and the wave splitter is arranged between the optical splitter and the office end and used for reducing the composite light wave into the source light wave, wherein light waves with different wavelengths in the source light wave are respectively transmitted to corresponding optical modules on the office end, and the corresponding optical modules on the office end generate corresponding downlink transmission light waves according to the received light waves and transmit downlink information to a remote end.
Therefore, the wave combiner and the wave separator are arranged to carry out subsequent wave combining and wave separating treatment on the light waves with different wavelengths output by the shared light source, and the number of optical fibers in optical path transmission can be effectively reduced.
As shown in fig. 2, in an embodiment, the forwarding network system includes: the shared light source 101, the local side 102, the remote side 103, the combiner 104, the optical splitter 105, and the demultiplexer 106. The source light waves generated by the shared light source 101 include light waves with different wavelengths, for example, λ 1 ……λ N Wherein N is a natural number greater than or equal to 2. The source light wave is combined into one path of light wave by the combiner 104 and then transmitted to the optical splitter 105, the optical splitter 105 splits the received path of light wave into M paths of light waves to be transmitted to M corresponding office ends 102, a splitter 106 is arranged at each office end 102, the splitter 106 reduces the light wave transmitted by the optical splitter 105 into light waves with wavelength of lambda respectively 1 ……λ N And are respectively transmitted to the corresponding optical modules of the office 102. The optical module on the office 102 generates a downlink transmission optical wave according to the received optical wave, and transmits downlink information to the remote 103. Specifically, the optical module of the office 102 loads data information onto an optical wave via a modulator to generate a wavelength λ 1 To lambda N Downstream optical signals (i.e., downstream propagating optical waves). The optical module at the far end 103 receives the downlink optical signal and performs a secondary modulation on the downlink optical signal, where the secondary modulation is performedThe modulation method in the optical module different from the office side is adopted, so as to generate the uplink transmission optical waves with the same wavelength, and transmit the uplink information to the office side 102.
In an embodiment, the optical module at the central office loads downlink information on the downlink transmission optical wave in a first modulation manner; the remote optical module loads uplink information on the uplink transmission light wave in a second modulation mode; wherein the first modulation scheme is different from the second modulation scheme. Specifically, the first modulation scheme may be phase modulation, and the second modulation scheme may be intensity modulation, or the first modulation scheme may be intensity modulation, and the second modulation scheme may be phase modulation.
In an embodiment, to further reduce the optical fiber requirement of the forwarding network system, as shown in fig. 3, the forwarding network system further includes, on the structure shown in fig. 2: a first multiplexer-demultiplexer 107 and a second multiplexer-demultiplexer 108. Wherein the content of the first and second substances,
the first multiplexer/demultiplexer 107 is connected to the office end 102 and the second multiplexer/demultiplexer 108, and is configured to combine downlink transmission light waves corresponding to multiple optical modules on the office end 102 and transmit the combined downlink transmission light waves to the second multiplexer/demultiplexer 108, and separate uplink transmission light waves from the second multiplexer/demultiplexer 108 and output the separated uplink transmission light waves to corresponding optical modules on the office end 102;
the second multiplexer/demultiplexer 108 is connected to the first multiplexer/demultiplexer 107 and the far end 103, and is configured to combine a plurality of uplink transmission light waves corresponding to the far end 103 and transmit the combined uplink transmission light waves to the first multiplexer/demultiplexer 107, and separate downlink transmission light waves from the first multiplexer/demultiplexer 107 and output the separated downlink transmission light waves to a corresponding optical module on the far end 103.
In an embodiment, the first multiplexer/demultiplexer 107 and the second multiplexer/demultiplexer 108 are connected to each other via a single optical fiber based on a single-fiber bidirectional mode. Thus, the required amount of optical fiber can be reduced, and the asymmetry of the optical fiber can be eliminated.
In an embodiment, the distal end comprises at least one light module, as shown in fig. 4, the light module comprising: a transceiving port (not shown in the figure), a circulator, a beam splitter, a detector and a modulator; the receiving and transmitting port is connected with the circulator and used for receiving the downlink transmission light wave, transmitting the downlink transmission light wave to the circulator and receiving the uplink transmission light wave output by the circulator; the circulator is connected with the optical splitter and is used for transmitting the downlink transmission light wave to the optical splitter and transmitting the uplink transmission light wave to the transceiving port; the optical splitter is connected with the detector and the modulator and is used for splitting the downlink transmission light wave into two paths, wherein one path of the downlink transmission light wave is continuously transmitted to the detector as an uplink transmission light wave, and the other path of the downlink transmission light wave is transmitted to the modulator as an uplink transmission light wave; the detector is used for acquiring downlink information carried in the downlink transmission light wave and transmitting the downlink information in a downlink manner; and the modulator is connected with the circulator and is used for loading uplink information on the uplink transmission light wave and transmitting the uplink transmission light wave loaded with the uplink information to the circulator.
In an application example, the downlink transmission light wave received by the transceiving port has a wavelength λ 1 Phase signal PSK of wavelength λ 1 The phase signal PSK is transmitted to an optical splitter through a circulator, and the optical splitter transmits the wavelength of the phase signal PSK to a light source 1 The phase signal PSK is divided into two paths, the first path is transmitted to a detector, the detector detects downlink information carried in the downlink transmission light wave and transmits the downlink information in a downlink mode, the second path is transmitted to a modulator, the modulator loads the uplink information through intensity modulation, and the generated wavelength is lambda 1 OOK (i.e. the upstream transmission light wave) of intensity signal of (a), the wavelength of which is λ 1 The strength signal OOK is transmitted to the transceiving port through the circulator.
In the embodiment of the invention, the far-end optical module can only have one port (namely a receiving and transmitting port), the port can receive downlink transmission light waves and transmit uplink transmission light waves, and the optical module does not need a laser, so that the design difficulty of the far-end optical module in the aspects of environment temperature and the like is reduced.
The invention is further illustrated by the following application examples.
As shown in fig. 5, in the present embodiment, the shared light source is composed of a group of laser arrays, and outputs light waves with different wavelengths respectively. Shared light source laserThe wavelength emitted by the array is lambda 1 To lambda N After the optical waves are combined by the combiner, a plurality of identical optical wave groups are generated by a splitter (namely the optical splitter), and each optical wave group corresponds to 1 BBU; and transmitting the optical waves to the BBU side along the optical fiber, and respectively transmitting the optical waves with different wavelengths to one optical module corresponding to the BBU by adopting a wave splitter. Loading data information on an optical wave through modulator modulation (such as phase modulation) in a BBU optical module to generate a wavelength lambda 1 To lambda N The downlink optical signal of (1). And after wavelength division multiplexing by a wave combiner, transmitting along optical fibers from the BBU to the RRU. And after the optical signals reach the RRU side, optical signals with different wavelengths are respectively sent to the optical module of each RRU by adopting a wave splitter. After receiving the signal, the RRU side optical module is divided into two parts by an optical splitter, one part of the optical signal is sent to a detector to complete downlink transmission, and the other part of the optical signal is modulated (such as intensity modulation) by a modulator in the RRU side optical module, uplink data information is loaded on the optical signal to generate an uplink optical signal with the same wavelength, and the uplink optical signal is subjected to wavelength division multiplexing by a combiner and then is transmitted along an optical fiber in the direction from the RRU to the BBU. And after the optical signals reach the BBU side, optical signals with different wavelengths are respectively sent to each optical module of the BBU by adopting a wave splitter. And after the BBU side optical module receives the signal, finishing uplink transmission. The optical signal transmitted between the RRU and the BBU may adopt a single fiber bidirectional scheme, and at this time, the optical module of the RRU needs to perform architecture adjustment, as shown in fig. 4. The optical module is provided with 1 port (same receiving and transmitting port), the receiving and transmitting port receives a downlink optical signal (the modulation mode is phase modulation), the downlink optical signal is output by the circulator and then is divided into two parts by the optical splitter, one part of the optical signal is sent to the detector to complete downlink transmission, the other part of the optical signal is modulated by the modulator (the modulation mode is intensity modulation), uplink data information is loaded on the optical signal, an uplink optical signal with the same wavelength is generated, and the uplink optical signal is output by the optical module port through the circulator. In this scheme, uplink and downlink signals need to have different modulation modes.
An embodiment of the present invention further provides an optical module, as shown in fig. 4, where the optical module includes: the device comprises a transceiving port, a circulator, a light splitter, a detector and a modulator; the receiving and transmitting port is connected with the circulator and used for receiving downlink transmission light waves, transmitting the downlink transmission light waves to the circulator and receiving uplink transmission light waves output by the circulator; the circulator is connected with the optical splitter and is used for transmitting the downlink transmission light wave to the optical splitter and transmitting the uplink transmission light wave to the transceiving port; the optical splitter is connected with the detector and the modulator and is used for splitting the downlink transmission light wave into two paths, wherein one path of the downlink transmission light wave is continuously transmitted to the detector as the downlink transmission light wave, and the other path of the downlink transmission light wave is transmitted to the modulator as the uplink transmission light wave; the detector is used for acquiring downlink information carried in the downlink transmission light wave and transmitting the downlink information in a downlink manner; and the modulator is connected with the circulator and is used for loading uplink information on the uplink transmission light wave and transmitting the uplink light wave loaded with the uplink information to the circulator.
The optical module only needs one port, can receive downlink transmission light waves and send uplink transmission light waves, does not need a laser, and reduces the design difficulty of the remote optical module in the aspects of environment temperature and the like.
It should be noted that: "first," "second," and the like are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order.
In addition, the technical solutions described in the embodiments of the present invention may be arbitrarily combined without conflict.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (10)
1. A forwarding network system, comprising:
a shared light source for generating source light waves;
the local side is connected with the shared light source and used for generating downlink transmission light waves by the source light waves and transmitting downlink information to a far end;
the remote end is connected with the local end and used for generating uplink transmission light waves by the downlink transmission light waves and transmitting uplink information to the local end;
the optical module of the local side loads downlink information on the downlink transmission optical wave in a first modulation mode;
the remote optical module loads uplink information on the uplink transmission light wave in a second modulation mode;
wherein the first modulation scheme is different from the second modulation scheme.
2. The system according to claim 1, wherein the shared light source is a wavelength tunable optical module, and the source light wave includes two or more light waves with different wavelengths.
3. The system of claim 2, wherein the system further comprises:
the optical splitter is connected with the shared light source and the local side, and is used for dividing the source light waves into M groups of same source light waves and providing the source light waves for at least two local sides; wherein M is a natural number of 2 or more.
4. The system of claim 3, wherein the system further comprises:
the combiner is arranged between the shared light source and the optical splitter and is used for combining light waves with different wavelengths in the source light waves into a path of composite light wave for transmission; the optical splitter is used for splitting the composite light waves into M groups of same composite light waves;
and the wave splitter is arranged between the optical splitter and the office end and used for reducing the composite light wave into the source light wave, wherein light waves with different wavelengths in the source light wave are respectively transmitted to corresponding optical modules on the office end, and the corresponding optical modules on the office end generate corresponding downlink transmission light waves according to the received light waves and transmit downlink information to the remote end.
5. The system of claim 4, wherein the system further comprises: a first multiplexer/demultiplexer and a second multiplexer/demultiplexer;
the first multiplexer/demultiplexer is connected to the office end and the second multiplexer/demultiplexer, and is configured to combine downlink transmission light waves corresponding to the multiple optical modules on the office end and transmit the combined downlink transmission light waves to the second multiplexer/demultiplexer, and separate uplink transmission light waves from the second multiplexer/demultiplexer and output the separated uplink transmission light waves to corresponding optical modules on the office end;
the second multiplexer/demultiplexer is connected to the first multiplexer/demultiplexer and the far end, and is configured to combine a plurality of uplink transmission light waves corresponding to the far end and transmit the combined uplink transmission light waves to the first multiplexer/demultiplexer, and separate downlink transmission light waves from the first multiplexer/demultiplexer and output the separated downlink transmission light waves to a corresponding optical module on the far end.
6. The system according to claim 5, wherein the first multiplexer/demultiplexer and the second multiplexer/demultiplexer are connected via an optical fiber based on a single-fiber bi-directional mode.
7. The system of claim 1, wherein the remote end comprises at least one light module, the light module comprising: the device comprises a transceiving port, a circulator, a light splitter, a detector and a modulator; wherein, the first and the second end of the pipe are connected with each other,
the transceiving port is connected with the circulator and is used for receiving the downlink transmission light wave, transmitting the downlink transmission light wave to the circulator and receiving the uplink transmission light wave output by the circulator;
the circulator is connected with the optical splitter and is used for transmitting the downlink transmission light waves to the optical splitter and transmitting the uplink transmission light waves to the transceiving port;
the optical splitter is connected with the detector and the modulator and is used for splitting the downlink transmission light wave into two paths, wherein one path of the downlink transmission light wave is continuously transmitted to the detector as the downlink transmission light wave, and the other path of the downlink transmission light wave is transmitted to the modulator as the uplink transmission light wave;
the detector is used for acquiring downlink information carried in the downlink transmission light wave and transmitting the downlink information in a downlink manner;
and the modulator is connected with the circulator and is used for loading uplink information on the uplink transmission light wave and transmitting the uplink transmission light wave loaded with the uplink information to the circulator.
8. The forwarding network system of claim 1,
the local side is a baseband unit BBU or a distribution unit DU.
9. The forwarding network system of claim 1,
the remote end is a radio remote unit RRU or an active antenna unit AAU.
10. A light module, characterized in that the light module comprises: the device comprises a transceiving port, a circulator, a light splitter, a detector and a modulator; wherein the content of the first and second substances,
the receiving and transmitting port is connected with the circulator and used for receiving downlink transmission light waves, transmitting the downlink transmission light waves to the circulator and receiving uplink transmission light waves output by the circulator;
the circulator is connected with the optical splitter and is used for transmitting the downlink transmission light wave to the optical splitter and transmitting the uplink transmission light wave to the transceiving port;
the optical splitter is connected with the detector and the modulator and is used for splitting the downlink transmission light wave into two paths, wherein one path of the downlink transmission light wave is continuously transmitted to the detector as the downlink transmission light wave, and the other path of the downlink transmission light wave is transmitted to the modulator as the uplink transmission light wave;
the detector is used for acquiring downlink information carried in the downlink transmission light wave and transmitting the downlink information in a downlink manner;
and the modulator is connected with the circulator and is used for loading uplink information on the uplink transmission light wave by adopting a modulation mode different from that of the downlink transmission light wave and transmitting the uplink transmission light wave loaded with the uplink information to the circulator.
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| CN101662707A (en) * | 2009-10-14 | 2010-03-03 | 烽火通信科技股份有限公司 | Method and device for sharing broadband light source in a plurality of WDM-PON systems |
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| CN104579536B (en) * | 2014-12-16 | 2018-03-06 | 北京邮电大学 | Upper and lower row of channels reuses WDM passive optical network system |
| US10135218B2 (en) * | 2015-10-02 | 2018-11-20 | Ayar Labs, Inc. | Multi-wavelength laser system for optical data communication links and associated methods |
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