Dense wavelength division multiplexing transmission system capable of expanding O-band wavelength signals
By employing C-band DWDM optical modules and merging O-band wavelength signals in the DWDM system, the problems of insufficient channel quantity and transmission rate in the DWDM system were solved, achieving high-speed transmission of 100Gbps and long-distance transmission of O-band wavelength signals, thus meeting the communication requirements of optical fiber networks.
Patent Information
- Application Number
- CN202520255742.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-18
- Publication Date
- 2025-12-30
- Estimated Expiration
- 2035-02-18
AI Technical Summary
Existing DWDM systems cannot meet the growing communication demands in terms of channel quantity and transmission rate, and traditional networking lacks flexibility and allocation capabilities, making it impossible to achieve high-speed fiber optic network communication.
Using a C-band DWDM optical module as the main line, it does not rely on a Muxponder for signal conversion and merges the O-band wavelength signal into the trunk for long-distance transmission. Through the optical signal path composed of an arrayed waveguide grating, filter and amplifier, a transmission rate of 100Gbps and above is achieved.
It achieves a transmission rate of 100Gbps or higher for each channel, meeting the growing communication demands and expanding the long-distance transmission capability of O band wavelength signals. It supports C+L band DWDM wavelength channel spacing and O band DWDM channel spacing, with a theoretical bandwidth extension of 100nm.
Smart Images
Figure CN223744729U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of optical fiber communication, especially a dense wavelength division multiplexing transmission system of extensible O band wavelength signal. BACKGROUND
[0002] Wavelength Division Multiplexing (WDM) is a technology that combines two or more different wavelength optical carrier signals (carrying various information) at the sending end by a multiplexer (also known as a combiner, Multiplexer) and coupled into the same optical fiber of the optical line for transmission; at the receiving end, the various wavelength optical carriers are separated by a demultiplexer (also known as a splitter, Demultiplexer), and then further processed by an optical receiver to recover the original signal. This technology of transmitting two or more different wavelength optical signals simultaneously in the same optical fiber is called WDM. WDM can be divided into CWDM (Coarse WDM) and DWDM (Dense WDM), where DWDM uses a more dense wavelength bandwidth interval, has a larger capacity, a longer transmission distance, and is more flexible. There are two common ways to implement DWDM currently, which are thin film filter (TFF) and arrayed waveguide grating (AWG). However, as the number of channels increases, the loss of DWDM using TFF will gradually deteriorate, so it is usually used for DWDM with less than 16 channels. In order to meet the requirement of more channel quantity, DWDM based on AWG technology emerges as the times require, AWG uses a parallel structure to realize the transmission of dozens of wavelength signals through multiplexing and demultiplexing, has more channel quantity and wider bandwidth, and can be used for high-speed optical fiber network communication.
[0003] Nowadays, with the rapid development of the Internet, people have increasingly high demands for network in different scenarios, hoping for more channel quantity, higher transmission rate, and longer transmission distance to meet the application of optical fiber network communication in some specific scenarios. However, the networking flexibility and allocation ability of the traditional DWDM system cannot meet the market communication demand. The bandwidth of optical fiber communication is very large, and a single optical fiber can transmit multiple wavelengths of optical signals simultaneously, each wavelength can transmit different information. This WDM technology greatly improves the transmission capacity of optical fiber. In addition, with the development of technology, the single wavelength transmission rate is also continuously increasing, and currently it has reached hundreds of Gbps or even Tbps level. Therefore, optical fiber communication can easily meet the demand of large-scale data transmission. Because the loss of optical fiber is very low (usually less than 0.2 dB / km), the transmission distance of optical fiber communication system can be very long. In practical application, through the use of optical amplifier and other technical means, the transmission distance of optical fiber can be further extended to hundreds or even thousands of kilometers. This makes optical fiber communication have a significant advantage in long-distance communication.
[0004] Existing DWDM backbone systems such as Figure 1 As shown, from site A to site B, several C-band 25Gbps signals, after being converted by a Muxponder (a combination of a Multiplexer and a Transponder), are combined through an AWG array waveguide grating 11, one of the main WDM schemes. Then, they are combined from the transmission end to the COM end of the DWDM m-hop n filter 2. The m-hop n filter 2 divides the entire C-band or C / L-band wavelength into two parts, one of which is used for transmission from site A to site B. The transmitted wavelength signal passes through a dispersion-compensated DCF 3, and then travels over tens of kilometers of trunk line to the distance where the signal needs to be amplified. Here, a DWDM m-hop n filter 2 and an EDFA amplifier 5 are set up. The trunk line signal is split from the COM end of the DWDM m-hop n filter 2 to the transmission end. The transmitted wavelength signal reaches the EDFA for optical power amplification to compensate for the attenuation caused by long-distance transmission. Then, it passes through the same AWG array waveguide grating 11 for further splitting. The several wavelength signals after splitting are received and processed by different optical modules.
[0005] Similarly, from site B to site A, several C-band 25Gbps signals, after being converted by the Muxponder, are combined through the AWG array waveguide grating 12, and then combined again from the reflection end to the COM end of the DWDM m-hop n filter 2. The m-hop n filter divides the entire C-band or C / L-band wavelength into two parts, with the reflected band used for transmission from site B to site A. The reflected wavelength signal is transmitted over tens of kilometers of trunk line to the distance requiring dispersion compensation and signal amplification. Here, a dispersion compensation DCF (marked 3) and an EDFA amplifier 5 are installed. The trunk line signal is demultiplexed from the COM end to the reflection end of the DWDM m-hop n filter 2, with the reflected band signal reaching the EDFA for optical power amplification to compensate for attenuation caused by long-distance transmission. It is then demultiplexed again through the same AWG array waveguide grating 12, and the several wavelength signals after demultiplexing are received and processed by different optical modules.
[0006] As can be seen from the above process, multiple Muxponders and multiple 100G LR4 optical modules are required on both sides of the system. The speed of these optical modules is ultimately reduced by the Muxponders, and high-speed DWDM signal transmission to the backbone is not achieved.
[0007] It should be noted that the O band, C band and C / L band are all terms in the field of optical communication, especially in wavelength division multiplexing (WDM) systems, used to describe different optical wavelength ranges. O band (Original band) wavelength range: 1264 nm - 1337 nm, O band is the earliest wavelength range used in optical communication, also known as "original band", this band is located in the near-infrared region, and is usually used in early fiber systems. C band (Conventional band) wavelength range: 1530 nm - 1565 nm, C band is the most commonly used band in the field of fiber communication, especially in long-distance communication, C band has very low transmission loss. L band (Long wavelength band) wavelength range: 1565 nm - 1625 nm, L band is usually considered as the band next to C band, and is often used together with C band to expand the bandwidth of the communication system. C / L band (C + L band) wavelength range: 1530 nm - 1625 nm (combined C band and L band), C / L band is a band that combines the use of C band and L band, and is usually used to support higher-capacity fiber communication systems. Invention content
[0008] To solve the above problems, the utility model provides a kind of dense wavelength division multiplexing transmission system of extensible O band wavelength signal, main line directly uses C band (1530~1565nm) DWDM optical module, no longer rely on using Muxponder to carry out signal conversion, the transmission rate of each channel can be improved to 100Gbps and above, and O band wavelength signal is also merged into main line and transmitted long distance, meet the growing demand for communication.
[0009] The technical scheme adopted by the utility model is:
[0010] The application discloses a kind of scalable O band wavelength signal dense wave division multiplexing transmission system, including two first main line and second main line of the optical signal that can be mutually transmitted, first main line includes first arrayed waveguide grating module, the side of first arrayed waveguide grating module is butt joint with multiple first main path optical module, the other side of first arrayed waveguide grating module is sequentially connected with first filter and dispersion compensation module, first amplifier is further provided between first arrayed waveguide grating module and first filter for amplifying optical signal when optical signal is transmitted to first arrayed waveguide grating module, the side of dispersion compensation module is butt joint with first expansion port, first expansion port is connected with first expansion branch, and first expansion branch includes first wavelength division multiplexer component for a plurality of O band wavelength signal division and wave combination with first expansion port, and first wavelength division multiplexer component is butt joint with at least one first branch optical module;Second main line includes second arrayed waveguide grating module, the side of second arrayed waveguide grating module is butt joint with multiple second main path optical module, and the other side of second arrayed waveguide grating module is connected with second filter, and second amplifier is further provided between second arrayed waveguide grating module and second filter for amplifying optical signal when optical signal is transmitted to second arrayed waveguide grating module, the side of second filter is butt joint with second expansion port, and second expansion port is connected with first expansion port by optical fiber, and second expansion port is connected with second expansion branch, and second expansion branch includes second wavelength division multiplexer component for a plurality of O band wavelength signal division and wave combination with second expansion port, and wavelength division multiplexer component is butt joint with at least one second branch optical module.
[0011] Preferably, the first arrayed waveguide grating module includes a first arrayed waveguide grating for combining optical signals and a second arrayed waveguide grating for dividing optical signals, the first arrayed waveguide grating is butt joint with the first filter, and the first amplifier is between the first filter and the second arrayed waveguide grating;The second arrayed waveguide grating module includes a third arrayed waveguide grating for combining optical signals and a fourth arrayed waveguide grating for dividing optical signals, the third arrayed waveguide grating is butt joint with the second filter, and the second amplifier is between the second filter and the fourth arrayed waveguide grating.
[0012] More preferably, the first main path optical module and the second main path optical module are C band or C / L band DWDM optical modules.
[0013] Preferably, the first filter and the second filter are DWDM m-hop n filters.
[0014] Preferably, the first expansion port and the second expansion port are implemented by FWDM wideband filters.
[0015] Preferably, the first wavelength division multiplexer component and the second wavelength division multiplexer component are wavelength division multiplexers, and the wavelength division multiplexers correspond to a plurality of branch optical modules.
[0016] Preferably, the first and second wavelength division multiplexing components are fiber circulators corresponding to one or more branch optical modules.
[0017] More preferably, the first and second branch optical modules are O band wavelength optical modules.
[0018] Compared with the prior art, the dense wavelength division multiplexing transmission system provided by the utility model has the advantages that the utility model provides a dense wavelength division multiplexing transmission system capable of expanding O band wavelength signals, the main line directly uses C band DWDM optical modules, and no longer relies on using Muxponder to convert signals, the transmission rate of each channel can be improved to 100 Gbps or above, and O band wavelength signals are also merged into the main line for long-distance transmission, thereby meeting the growing communication demand. BRIEF DESCRIPTION OF DRAWINGS
[0019] Figure 1 It is a schematic diagram of the dense wavelength division multiplexing main line system in the prior art.
[0020] Figure 2 It is a schematic diagram of the dense wavelength division multiplexing transmission system capable of expanding O band wavelength signals provided by the utility model. Figure 1 .
[0021] Figure 3 It is a schematic diagram of the dense wavelength division multiplexing transmission system capable of expanding O band wavelength signals provided by the utility model. Figure 2 . DETAILED DESCRIPTION
[0022] The preferred embodiments provided by the utility model are specifically described according to the drawings.
[0023] Figures 2 to 3 It is a preferred embodiment of the dense wavelength division multiplexing transmission system capable of expanding O band wavelength signals provided by the utility model. Figures 2 to 3As shown, the dense wavelength division multiplexing transmission system of the expandable O band wavelength signal includes two first main lines 10 and second main lines 20 which can transmit optical signals to each other, the first main line 10 includes a first arrayed waveguide grating module 11 for combining or dividing optical signals, one side of the first arrayed waveguide grating module 11 is connected to a plurality of first main line optical modules 12 for transmitting or receiving optical signals, and the other side of the first arrayed waveguide grating module 11 is sequentially provided with a first filter 13 for filtering or combining optical signals and a dispersion compensation module 17 for compensating optical signals, and a first amplifier 14 is further arranged between the first arrayed waveguide grating module 11 and the first filter 13 for amplifying optical signals when the optical signals are transmitted to the arrayed waveguide grating module 11, and one side of the dispersion compensation module 17 is also connected to a first expansion port 15, and the first expansion port 15 is connected to a first expansion branch 16; the second main line 20 includes a second arrayed waveguide grating module 21, one side of the second arrayed waveguide grating module 21 is connected to a plurality of second main line optical modules 22 for transmitting or receiving optical signals, and the other side of the second arrayed waveguide grating module 21 is sequentially provided with a second filter 23 for bidirectional filtering and combining optical signals, and a second amplifier 24 is further arranged between the second arrayed waveguide grating module 21 and the second filter 23 for amplifying optical signals when the optical signals are transmitted to the second arrayed waveguide grating module 21, one side of the second filter 23 is connected to a second expansion port 25, the second expansion port 25 is connected through an optical fiber, and the second expansion port 25 is connected to a second expansion branch 26; in use, the first main line 10 and the second main line 20 are respectively arranged at site A and site B, and optical signals can be transmitted from the first main line 10 at site A to the second main line 20 at site B, and also can be transmitted from the second main line 20 at site B to the first main line 10 at site A; and the expansion branch is introduced through the expansion port, the expansion branch introduces the O band wavelength signal into the main line and transmits it to another expansion port, and is downloaded through the connected another expansion branch, so that the signal conversion using Muxponder is no longer relied on, the transmission rate of each channel can be improved to 100Gbps and above, and the O band wavelength signal is also combined into the backbone line for long-distance transmission, which meets the increasing communication demand.
[0024] The first arrayed waveguide grating module 11 includes a first arrayed waveguide grating 111 for combining optical signals and a second arrayed waveguide grating 112 for splitting optical signals. The first arrayed waveguide grating 111 is connected to the first filter 13, and the first amplifier 14 is located between the first filter 13 and the second arrayed waveguide grating 112. When the first main line 10 transmits signals to the second main line 20, several first main optical modules 12 combine the signals through the first arrayed waveguide grating 111, and then pass through the transmission end of the first filter 13 to the COM end for further combining. When the second main line 20 transmits signals to the first main line 10, the optical signals pass through the COM end of the first filter 13 to the reflection end for further splitting. After splitting, the DWDM wavelength signal is amplified by the first amplifier 14 to compensate for the attenuation caused by long-distance transmission, and then passes through the second arrayed waveguide grating 112 for further splitting. The several wavelength signals after splitting are received and processed by different first main optical modules 12. The second arrayed waveguide grating module 21 includes a third arrayed waveguide grating 211 for combining optical signals and a fourth arrayed waveguide grating 212 for splitting optical signals. The third arrayed waveguide grating is connected to the second filter 23. The second amplifier 24 is located between the second filter 23 and the fourth arrayed waveguide grating 212. When the second main line 20 transmits signals to the first main line 10, several second main optical modules 22 combine the signals through the third arrayed waveguide grating 211, and then pass through the transmission end of the second filter 23 to the COM end for further combining. When the first main line 10 transmits signals to the second main line 20, the optical signals pass through the COM end of the second filter 23 to the reflection end for further splitting. After splitting, the DWDM wavelength signal is amplified by the second amplifier 24 to compensate for the attenuation caused by long-distance transmission, and then passes through the fourth arrayed waveguide grating 212 for further splitting. The several wavelength signals after splitting are received and processed by different second main optical modules 22.
[0025] The first main optical module 12 and the second main optical module 22 are DWDM optical modules with a wavelength range of 1530~1565nm; the first filter 13 and the second filter 23 are DWDM m-hop n filters. The dispersion compensation module 17 is a dispersion compensation fiber. The main function of the dispersion compensation fiber is to compensate for dispersion during optical fiber transmission through the reverse dispersion effect, thereby reducing signal pulse broadening and distortion. By adding dispersion compensation fibers to the communication link, signal quality can be effectively improved.
[0026] The first extension branch 16 and the second extension branch 26 have similar structures. The first extension branch 16 includes a wavelength division multiplexing (WDM) component 161, which interfaces with the first extension port 15, for demultiplexing and combining several O-band wavelength signals. The WDM component 161 interfaces with at least one first branch optical module 162. The second extension branch 26 includes a WDM component 261, which interfaces with the second extension port 25, for demultiplexing and combining several O-band wavelength signals. The WDM component 261 interfaces with at least one second branch optical module 262. In the first main line 10, since the O-band wavelength signals are in the zero-dispersion region, they can be transmitted over long distances without passing through the dispersion compensation module 17. Therefore, the first extension port 15 for the O-band wavelength is placed after the dispersion compensation module 17. The first branch optical module 162 and the second branch optical module 262 are O-band wavelength optical modules.
[0027] Both the first expansion port 15 and the second expansion port 25 are implemented by FWDM broadband filters. The FWDM broadband filter 100 can realize the demultiplexing and multiplexing of optical signals.
[0028] like Figure 2 As shown, in a preferred embodiment, both the first wavelength division multiplexing component 161 and the second wavelength division multiplexing component 261 are WDM wavelength division multiplexers, and each WDM wavelength division multiplexer corresponds to multiple branch optical modules.
[0029] like Figure 2As shown, when an optical signal is transmitted from site A to site B, the optical signals from several C-band or C / L-band DWDM first main line optical modules 12 in the first main line 10 are combined through the first array waveguide grating 111, and then combined from the transmission end of the first filter 13 to the COM end. The first filter 13 divides the entire C-band or C / L-band wavelength into two parts: the C-band or C / L-band transmission band and the C-band or C / L-band reflection band. The C-band or C / L-band transmission band is used for transmission from site A to site B. The transmission wavelength signal is compensated for dispersion by a dispersion compensation module 14. The C-band or C / L-band DWDM wavelength signal is then combined from the transmission end of the FWDM broadband filter to the COM end, and then transmitted through the optical fiber of the tens of kilometers of trunk line to reach the distance where the signal needs to be amplified, entering the site. Within the second main line 20 of B, the signal passes sequentially through an FWDM broadband filter, a second filter 23, and a second amplifier 24. The main line signal is split from the COM end of the FWDM broadband filter to the transmission end. The transmission band signal then passes through the COM end of the second filter 23 to the reflection end for further splitting. After splitting, the DWDM wavelength signal is amplified by amplifier 15 to compensate for attenuation caused by long-distance transmission. It then passes through the fourth array waveguide grating 212 for further splitting. The several wavelength signals after splitting are received and processed by different second main line optical modules 22.
[0030] When the optical signal is transmitted from site A to site B, the transmission process of the O-band optical signal is as follows: several O-band first branch optical module signals 162 in the first main line 10 are combined through a WDM wavelength division multiplexer, and then combined from the reflection end of the FWDM broadband filter in the first extension port 15 to the COM end and then back to the trunk line. This is equivalent to extending the O-band wavelength signal on the trunk line that transmits DWDM wavelength signals. Since the O-band wavelength signal is in the zero dispersion region, it can be transmitted over long distances without going through the dispersion compensation module 17. Therefore, a second extension port 25 can be set at a suitable location in site B after a transmission distance of tens of kilometers. The O-band wavelength signal is downloaded from the COM end of the FWDM broadband filter in the second extension port 25 to the reflection end (Note: the DWDM wavelength signal is from the COM end of the FWDM broadband filter to the transmission end). Then, it is demultiplexed through the same WDM wavelength division multiplexer. The several O-band wavelength signals after demultiplexing are received and processed by different second branch optical modules 262.
[0031] When an optical signal is transmitted from site B to site A, the optical signals from several C-band or C / L-band DWDM optical modules 22 in the second main line 20 are combined through the fourth arrayed waveguide grating 212, and then combined from the reflection end to the COM end of the second filter 23. The second filter 23 divides the entire C-band or C / L-band wavelength into two parts, where the reflection band is used for transmission from site B to site A, and the wavelength signal is combined from the transmission end of the FWDM broadband filter in the second main line 20 to the COM end, and then transmitted through tens of kilometers of trunk line to reach the distance where the signal needs to be amplified, entering the site. Within the first main line 10 of A, the optical signal is split from the COM end of the FWDM broadband filter to the transmission end, then passes through the dispersion compensation module 17 to correct the signal spectrum, and then reaches the first filter 13. From the COM end of the first filter 13 to the reflection end, it is split. After splitting, the DWDM wavelength signal is amplified by the first amplifier 14 to compensate for the attenuation caused by long-distance transmission, and then passes through the second array waveguide grating 112 for further splitting. The several wavelength signals after splitting are received and processed by different first main line optical modules 12.
[0032] When the optical signal is transmitted from site B to site A, the transmission process of the O-band optical signal is as follows: several O-band second branch optical module signals 262 in the second main line 20 (note: the TX wavelength and RX wavelength are exactly opposite to those from site A to site B) are combined by a WDM wavelength division multiplexer, and then combined from the reflection end of the FWDM broadband filter of the second extension port 25 to the COM end and back to the trunk line. This is equivalent to extending the O-band wavelength signal of the trunk line transmitting DWDM wavelength signals. Since the O-band wavelength signal is in the zero-dispersion region, it can be transmitted over long distances without dispersion compensation DCF. Therefore, after a transmission distance of tens of kilometers, the first extension port 15 can be set at a suitable location in site A. The O-band wavelength signal is downloaded from the COM end of the FWDM broadband filter in the first expansion port 15 to the reflection end (Note: the DWDM wavelength signal is from the COM end of the FWDM to the transmission end), and then is divided by the same WDM wavelength division multiplexer 100. The several O-band wavelength signals after division are received and processed by different first branch optical modules 162.
[0033] like Figure 3As shown, in another preferred embodiment, both the first wavelength division multiplexing component 161 and the second wavelength division multiplexing component 261 are fiber optic circulators. The fiber optic circulators are 1310nm fiber optic circulators. The fiber optic circulators only use 3 ports and can be used with one or more branch optical modules, which is suitable for certain specific application scenarios. The transmission process of the optical signal can be referred to the previous embodiment.
[0034] This invention provides a scalable O-band wavelength signal dense wavelength division multiplexing (DWDM) transmission system. The main line directly uses C-band (1530~1565nm) DWDM optical modules, eliminating the need for signal conversion using a Muxponder. Therefore, the transmission rate of each channel can be increased to 100Gbps or higher to match and meet the ever-growing backbone communication demands. Simultaneously, due to the surge in demand, C-band communication capacity is saturated, necessitating expansion to L-band, and even designing O-band as the DWDM channel spacing. Both C-band and L-band wavelength signals can be directly transmitted over long distances on the main line via dispersion compensation DCF and fiber amplifier EDFA, while O-band wavelength signals, being in the zero-dispersion region, can be transmitted over long distances without dispersion compensation. However, commercially available EDFAs do not yet support the O band. Therefore, the O band wavelength signal can be placed after the EDFA fiber amplifier and then combined with the C+L band wavelength signals via an FWDM broadband filter before being transmitted over the trunk. The FWDM filter transmits the C+L band wavelength and reflects the O band wavelength, so the O band wavelength signal is also combined and transmitted over long distances. Thus, the DWDM long-distance transmission system extends the O band signal. The O band wavelength signal can include both LWDM and DWDM wavelength channel spacing. Typically, after long-distance transmission of 10km to 40km, the combined wavelength signal passes through the same FWDM broadband filter. The O band wavelength signal is reflected and downloaded, while the C+L band wavelength signal is amplified by the EDFA and then enters the DWDM wavelength division multiplexer for wavelength division, before being received and processed by the corresponding DWDM optical module.
[0035] This invention provides a dense wavelength division multiplexing (DWDM) transmission system for scalable O-band wavelength signals. The main line is based on DWDM technology to multiplex and demultiplex various signals. It provides an O-band expansion port that connects to a wavelength division multiplexing component and then to at least one O-band wavelength branch optical module. It also provides an O-band expansion port that connects to a 1310nm circulator and then to one or more O-band wavelength optical modules.
[0036] This invention provides a dense wavelength division multiplexing (DWDM) transmission system for scalable O-band wavelength signals. It not only supports C+L band DWDM wavelength channel spacing, but also supports subdividing the O band into DWDM channel spacing, theoretically extending the usable bandwidth by 100nm. The direct transmission rate of the optical module can reach 100Gbps and above, making it suitable for long-distance optical fiber network transmission scenarios.
[0037] In summary, the technical solution of this utility model can fully and effectively achieve the aforementioned objectives. Furthermore, the structure and functional principles of this utility model have been fully verified in the embodiments, achieving the expected effects and objectives. Without departing from the principles and essence of this utility model, various changes or modifications can be made to the embodiments. Therefore, this utility model includes all substitutions within the scope mentioned in the patent application claims, and any equivalent changes made within the scope of this patent application are within the scope of the patent application.
Claims
1. A scalable dense wavelength division multiplexing transmission system for O band wavelength signals, comprising two first and second main lines which can mutually transmit optical signals, characterized in that, The first main line includes a first arrayed waveguide grating module, a plurality of first main light modules are butt-jointed to one side of the first arrayed waveguide grating module, a first filter and a dispersion compensation module are connected to the other side of the first arrayed waveguide grating module in sequence, a first amplifier for amplifying optical signals when the optical signals are transmitted to the first arrayed waveguide grating module is arranged between the first arrayed waveguide grating module and the first filter, a first expansion port is butt-jointed to one side of the dispersion compensation module, and a first expansion branch is connected to the first expansion port; the second main line includes a second arrayed waveguide grating module, a plurality of second main light modules are butt-jointed to one side of the second arrayed waveguide grating module, a second filter is connected to the other side of the second arrayed waveguide grating module, a second amplifier for amplifying optical signals when the optical signals are transmitted to the second arrayed waveguide grating module is arranged between the second arrayed waveguide grating module and the second filter, a second expansion port is butt-jointed to one side of the second filter, the second expansion port is connected to the first expansion port through an optical fiber, a second expansion branch is connected to the second expansion port, and the second expansion branch includes a second wavelength division multiplexer component for splitting and combining a plurality of O band wavelength signals, and the wavelength division multiplexer component is butt-jointed to at least one second branch light module.
2. The scalable dense wavelength division multiplexing transmission system of O band wavelength signals according to claim 1, wherein: The first arrayed waveguide grating module includes a first arrayed waveguide grating for combining optical signals and a second arrayed waveguide grating for splitting optical signals, the first arrayed waveguide grating is butt-jointed to the first filter, and the first amplifier is arranged between the first filter and the second arrayed waveguide grating; the second arrayed waveguide grating module includes a third arrayed waveguide grating for combining optical signals and a fourth arrayed waveguide grating for splitting optical signals, the third arrayed waveguide grating is butt-jointed to the second filter, and the second amplifier is arranged between the second filter and the fourth arrayed waveguide grating.
3. The scalable dense wavelength division multiplexing transmission system of O band wavelength signals according to claim 1, wherein: The first main light module and the second main light module are C band or C / L band DWDM light modules.
4. The scalable dense wavelength division multiplexing transmission system of O band wavelength signals according to claim 1, wherein: The first filter and the second filter are DWDM m-hop-n filters.
5. The scalable dense wavelength division multiplexing transmission system of O band wavelength signals according to claim 1, wherein: The first expansion port and the second expansion port are implemented by FWDM wideband filters.
6. The scalable O band wavelength signal dense wavelength division multiplexing transmission system of claim 1, wherein: The first wavelength division multiplexer component and the second wavelength division multiplexer component are wavelength division multiplexers, and the wavelength division multiplexers correspond to a plurality of branch light modules.
7. The scalable O band wavelength signal dense wavelength division multiplexing transmission system of claim 1, wherein: The first wavelength division multiplexer component and the second wavelength division multiplexer component are fiber circulators, and the fiber circulators correspond to one or more branch light modules.
8. The scalable O band wavelength signal dense wavelength division multiplexing transmission system of claim 1, wherein: The first branch light module and the second branch light module are O band wavelength light modules.