CN116865899A - ONU-end bidirectional SOA automatic gain control method and system - Google Patents
ONU-end bidirectional SOA automatic gain control method and system Download PDFInfo
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- CN116865899A CN116865899A CN202310870714.7A CN202310870714A CN116865899A CN 116865899 A CN116865899 A CN 116865899A CN 202310870714 A CN202310870714 A CN 202310870714A CN 116865899 A CN116865899 A CN 116865899A
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 230000003287 optical effect Effects 0.000 claims abstract description 125
- 238000011144 upstream manufacturing Methods 0.000 claims description 23
- 230000005540 biological transmission Effects 0.000 claims description 21
- 239000004065 semiconductor Substances 0.000 claims description 9
- 238000000926 separation method Methods 0.000 claims description 7
- 230000001360 synchronised effect Effects 0.000 claims description 6
- 230000003247 decreasing effect Effects 0.000 claims description 2
- 239000013307 optical fiber Substances 0.000 description 5
- 238000001514 detection method Methods 0.000 description 3
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- 239000000835 fiber Substances 0.000 description 2
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0201—Add-and-drop multiplexing
- H04J14/0215—Architecture aspects
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04J—MULTIPLEX COMMUNICATION
- H04J14/00—Optical multiplex systems
- H04J14/02—Wavelength-division multiplex systems
- H04J14/0221—Power control, e.g. to keep the total optical power constant
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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
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q11/00—Selecting arrangements for multiplex systems
- H04Q11/0001—Selecting arrangements for multiplex systems using optical switching
- H04Q11/0062—Network aspects
- H04Q11/0067—Provisions for optical access or distribution networks, e.g. Gigabit Ethernet Passive Optical Network (GE-PON), ATM-based Passive Optical Network (A-PON), PON-Ring
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Abstract
The application discloses an ONU-end bidirectional SOA automatic gain control method and a system, which relate to the technical field of optical access networks, and the method comprises the following steps: separating an uplink burst optical signal and a downlink continuous optical signal; when the uplink burst optical signal exists, the bias current of the SOA is increased, and when the uplink burst optical signal does not exist, the bias current of the SOA is reduced. The application can reduce the damage caused by cross gain modulation and enhance the performance of the system.
Description
Technical Field
The application relates to the technical field of optical access networks, in particular to an ONU-end bidirectional SOA automatic gain control method and system.
Background
In order to adapt to the rapid growth of emerging applications such as high-definition video streaming media, network games, cloud services and the like, the transmission capacity of an optical access network needs to be greatly enhanced. Operators are currently developing gigabit passive optical networks (G-PONs) and beginning to deploy 10Gbit/s PONs (i.e., XGS-PONs).
The increasing bandwidth demands have prompted standardization bodies to standardize the next-generation PON systems. There are several organizations working to drive the development of high-speed passive optical network technology, and the latest standard of the international telecommunications union (ITU-T) relates to 50G-PON. IEEE 802.3ca is researching the proposal of 100Gb/s for the next generation passive optical network.
With respect to the practical implementation of high-speed PON systems, one of the difficulties is achieving a high optical link budget (N1 level up to 29 dB) at such high rates. However, the main problems in the transmission of the high-speed direct detection systems such as fiber dispersion, nonlinearity and bandwidth limitation lead to lower receiving sensitivity in the direct detection system, and meanwhile, higher fiber entering power of a transmitting end can bring about larger nonlinearity, and further, lead to that the transmitting power cannot be too high, which presents challenges for realizing high power budget of the PON system.
A semiconductor optical amplifier (semiconductor optical amplifier, SOA) is used at the receiving end to increase the power of the receiving end, so that an effective solution for improving the power budget of a high-speed direct-detection PON system is provided. In order to reduce costs, the best solution is to use SOA to amplify both Downstream (DS) and Upstream (US) models. However, in the bidirectional amplification mode, the problem of using the SOA is: the cross gain modulation (XGM) generated when the downlink signal and the uplink burst mode signal are transmitted simultaneously may have an influence on the signal quality so as to degrade the system performance. When the ONU end sends out an uplink burst packet, the SOA gain available for the received downlink signal is reduced, and the system performance is reduced.
Disclosure of Invention
Aiming at the defects in the prior art, the first aspect of the application provides an ONU-end bidirectional SOA automatic gain control method, which can reduce the damage caused by cross gain modulation and enhance the performance of a system.
In order to achieve the above purpose, the application adopts the following technical scheme:
an ONU-end bidirectional SOA automatic gain control method comprises the following steps:
separating an uplink burst optical signal and a downlink continuous optical signal;
when the upstream burst optical signal exists, the bias current of the SOA of the semiconductor optical amplifier is increased, and when the upstream burst optical signal does not exist, the bias current of the SOA is reduced.
In some embodiments, increasing the bias current of the SOA when the upstream burst optical signal is present, and decreasing the bias current of the SOA when the upstream burst optical signal is absent, includes:
the envelope signal generated by the gate signal generator is used for controlling the transmission of the uplink burst data packet so as to control the generation of the uplink burst optical signal;
and performing automatic gain control on bias current of the SOA by utilizing the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
In some embodiments, the magnitude of the bias current of the SOA is adjusted based on the amplitude synchronization of the upstream burst optical signal.
In some embodiments, further comprising:
and keeping the bias current change of the SOA synchronous with the arrival time of the uplink burst optical signal.
In some embodiments, the upstream burst optical signal and the downstream continuous optical signal are separated by a wavelength division multiplexing filter and an optical isolator.
The second aspect of the application provides an ONU-end bidirectional SOA automatic gain control system, which can reduce damage caused by cross gain modulation and enhance the performance of the system.
In order to achieve the above purpose, the application adopts the following technical scheme:
an ONU-side bidirectional SOA automatic gain control system, comprising:
a bidirectional semiconductor optical amplifier SOA;
the signal separation device is connected with the bidirectional SOA signal and is used for separating an uplink burst optical signal and a downlink continuous optical signal which pass through the bidirectional SOA;
the gain control device is connected with the bidirectional SOA signal and is used for increasing the bias current of the SOA when the uplink burst optical signal exists and reducing the bias current of the SOA when the uplink burst optical signal does not exist.
In some embodiments, the gain control device includes a gate signal generator, where the gate signal generator is configured to generate an envelope signal to control transmission of an upstream burst data packet, so as to control generation of an upstream burst optical signal;
the gate signal generator also performs automatic gain control on bias current of the SOA through the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
In some embodiments, the gain control apparatus is further configured to:
and adjusting the bias current of the SOA based on the amplitude synchronization of the uplink burst optical signal.
In some embodiments, the gain control apparatus is further configured to:
and keeping the bias current change of the SOA synchronous with the arrival time of the uplink burst optical signal.
In some embodiments, the signal splitting means comprises a wavelength division multiplexing filter in signal connection with the bi-directional SOA, and an optical isolator in signal connection with the wavelength division multiplexing filter.
Compared with the prior art, the application has the advantages that:
the ONU-end bidirectional SOA automatic gain control method separates an uplink burst optical signal and a downlink continuous optical signal; when the uplink burst optical signal exists, the bias current of the SOA is increased, and when the uplink burst optical signal does not exist, the bias current of the SOA is reduced. Therefore, when the uplink burst optical signal sent by the ONU arrives, the bidirectional SOA can provide more gain for the system, and the influence of cross gain modulation on the downlink continuous optical signal on the system performance is avoided.
Drawings
Fig. 1 is a flowchart of an ONU-side bidirectional SOA automatic gain control method in an embodiment of the present application;
fig. 2 is a graph of signal effects with and without automatic gain control.
Fig. 3 is a block diagram of an ONU-side bidirectional SOA automatic gain control system according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments of the present application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
It should be noted that, when the ONU sends out an upstream burst packet, the SOA gain available for the received downstream signal decreases, because the upstream burst consumes a part of its gain, resulting in a decrease in system performance. How to control the current of the SOA so that the downlink signal can output a stable signal amplitude to the ONU-end detector after passing through the SOA is the problem to be solved by the application.
For this reason, referring to fig. 1, an embodiment of the present application provides a bidirectional SOA automatic gain control method at an ONU end, which includes the following steps:
s1, separating an uplink burst optical signal and a downlink continuous optical signal.
In a specific implementation, the upstream burst optical signal and the downstream continuous optical signal can be separated by a wavelength division multiplexing filter and an optical isolator.
S2, when the uplink burst optical signal exists, the bias current of the SOA of the semiconductor optical amplifier is increased, and when the uplink burst optical signal does not exist, the bias current of the SOA is reduced.
It can be understood that, referring to fig. 2, when the SOA does not have automatic gain control, when the ONU sends out an upstream burst optical signal, the gain of some SOA is consumed, so that the available gain of the downstream continuous optical signal is temporarily reduced, and the downstream continuous optical signal output by the SOA is lost, thereby damaging the system performance. When the bias current of the SOA carries out automatic gain control according to the uplink burst signal, the bias current is increased when the uplink burst signal exists, and the bias current is reduced when the burst signal does not exist, so that when the uplink burst optical signal sent by the ONU arrives, the SOA can provide more gain for the system, and the influence of the downlink continuous optical signal on the performance of the system is avoided.
In a specific implementation, step S2 includes the steps of:
the envelope signal generated by the gate signal generator is used for controlling the transmission of the uplink burst data packet so as to control the generation of the uplink burst optical signal;
and performing automatic gain control on bias current of the SOA by utilizing the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
In the uplink transmission channel, the envelope signal generated by the gate signal generator controls the switch of uplink burst data packet transmission, and simultaneously, carries out automatic gain control on the bias current of the SOA. The uplink burst data packet is modulated to generate an uplink burst optical signal, and the uplink burst optical signal is sent to the wavelength division multiplexing filter after passing through the optical isolator, and then is amplified by the bidirectional SOA and enters the optical fiber network.
The automatic gain control controls the bias current of the SOA according to the envelope signal generated by the gate signal generator, and when the gate signal is at a high level, namely the burst packet is generated, the bias current of the SOA is increased so as to compensate the damage caused by cross gain modulation when the uplink and downlink signals simultaneously occur. When the gate signal is low, the bias current of the SOA is reduced to provide gain for the downstream continuous optical signal alone.
In addition, the gain of the SOA can be managed according to the amplitude of the uplink burst signal, and the larger the amplitude of the uplink burst signal is, the larger the consumed gain is, so that the required bias current is also larger. In the preferred embodiment, the magnitude of the bias current of the SOA is adjusted synchronously based on the amplitude of the upstream burst optical signal.
In addition, in some preferred embodiments, the bias current variation of the SOA and the arrival time of the uplink burst optical signal can be kept synchronous.
In summary, according to the ONU-side bidirectional SOA automatic gain control method of the present application, the upstream burst optical signal and the downstream continuous optical signal are separated; when the uplink burst optical signal exists, the bias current of the SOA is increased, and when the uplink burst optical signal does not exist, the bias current of the SOA is reduced. Therefore, when the uplink burst optical signal sent by the ONU arrives, the bidirectional SOA can provide more gain for the system, and the influence of cross gain modulation on the downlink continuous optical signal on the system performance is avoided.
Meanwhile, referring to fig. 3, the embodiment of the application also provides an ONU-side bidirectional SOA automatic gain control system, which comprises a bidirectional semiconductor optical amplifier SOA, a signal separation device and a gain control device.
The signal separation device is connected with the bidirectional SOA signal and is used for separating an uplink burst optical signal and a downlink continuous optical signal which pass through the bidirectional SOA.
In some embodiments, the signal splitting means comprises a wavelength division multiplexing filter in signal connection with the bi-directional SOA, and an optical isolator in signal connection with the wavelength division multiplexing filter.
The characteristics of the optical isolator are: the forward insertion loss is low, the reverse isolation is high, and the return loss is high. The optical fiber is a passive device which allows light to pass in one direction and prevents the light from passing in the opposite direction, and has the function of limiting the direction of the light, so that the light can only be transmitted in one direction, and the light reflected by the optical fiber echo can be well isolated by the optical isolator, thereby improving the light wave transmission efficiency.
The gain control device is connected with the bidirectional SOA signal and is used for increasing the bias current of the SOA when the uplink burst optical signal exists and reducing the bias current of the SOA when the uplink burst optical signal does not exist.
In some embodiments, the gain control device includes a gate signal generator, where the gate signal generator is configured to generate an envelope signal to control transmission of an upstream burst data packet, so as to control generation of an upstream burst optical signal;
the gate signal generator also performs automatic gain control on bias current of the SOA through the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
In some embodiments, the gain control apparatus is further configured to:
and adjusting the bias current of the SOA based on the amplitude synchronization of the uplink burst optical signal.
In some embodiments, the gain control apparatus is further configured to:
and keeping the bias current change of the SOA synchronous with the arrival time of the uplink burst optical signal.
Details of the specific implementation are further described below in conjunction with fig. 3:
the ONU-side block diagram bidirectional SOA automatic gain control system is shown in fig. 3. The downlink continuous optical signal and the uplink burst optical signal adopt different wavelengths to carry out bidirectional transmission in the optical fiber. The received downlink continuous optical signal is amplified through a bidirectional SOA, separated through a wavelength division multiplexing filter and an uplink signal, then enters a photoelectric detector for photoelectric conversion, and then is sent to an error rate calculation module.
The envelope signal generated by the gate signal generator in the upstream transmission channel controls the switching of the data transmission and the switching of the light source (ECL light source), and simultaneously performs automatic gain control on the bias current of the SOA. The burst data generated by the data transmission module enters a Mach-Zehnder modulator to modulate an External Cavity Laser (ECL), and the generated burst optical signals are sent into a wavelength division multiplexing filter after passing through an optical isolator and then enter an optical fiber network after being amplified by an SOA. The automatic gain control controls the bias current of the SOA according to the envelope signal generated by the gate signal generator, and when the gate signal is in a high level, namely the uplink burst packet is generated, the bias current of the SOA is increased to compensate the damage caused by cross gain modulation when the uplink signal and the downlink signal simultaneously occur. When the gate signal is low, the SOA bias current is reduced to provide gain for the downstream continuous optical signal alone.
In summary, the ONU-side bidirectional SOA automatic gain control system of the present application includes a bidirectional semiconductor optical amplifier SOA, a signal separation device and a gain control device. The signal separation device is connected with the bidirectional SOA signal and is used for separating an uplink burst optical signal and a downlink continuous optical signal which pass through the bidirectional SOA; the gain control device is connected with the bidirectional SOA signal and is used for increasing the bias current of the SOA when the uplink burst optical signal exists and reducing the bias current of the SOA when the uplink burst optical signal does not exist. Therefore, when the uplink burst optical signal sent by the ONU arrives, the bidirectional SOA can provide more gain for the system, and the influence of cross gain modulation on the downlink continuous optical signal on the system performance is avoided.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element.
The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments. While the application has been described with reference to certain preferred embodiments, it will be understood by those skilled in the art that various changes and substitutions of equivalents may be made and equivalents will be apparent to those skilled in the art without departing from the scope of the application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. The ONU-end bidirectional SOA automatic gain control method is characterized by comprising the following steps:
separating an uplink burst optical signal and a downlink continuous optical signal;
when the upstream burst optical signal exists, the bias current of the SOA of the semiconductor optical amplifier is increased, and when the upstream burst optical signal does not exist, the bias current of the SOA is reduced.
2. The ONU-side bidirectional SOA automatic gain control method of claim 1, wherein increasing the bias current of the SOA when the upstream burst optical signal exists and decreasing the bias current of the SOA when the upstream burst optical signal does not exist comprises:
the envelope signal generated by the gate signal generator is used for controlling the transmission of the uplink burst data packet so as to control the generation of the uplink burst optical signal;
and performing automatic gain control on bias current of the SOA by utilizing the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
3. The ONU-side bidirectional SOA automatic gain control method according to claim 1 or 2, wherein:
and adjusting the bias current of the SOA based on the amplitude synchronization of the uplink burst optical signal.
4. The ONU-side bidirectional SOA automatic gain control method of claim 1, further comprising:
and keeping the bias current change of the SOA synchronous with the arrival time of the uplink burst optical signal.
5. The ONU-side bidirectional SOA automatic gain control method as claimed in claim 1, wherein:
and separating the uplink burst optical signal from the downlink continuous optical signal by a wavelength division multiplexing filter and an optical isolator.
6. An ONU-side bidirectional SOA automatic gain control system, comprising:
a bidirectional semiconductor optical amplifier SOA;
the signal separation device is connected with the bidirectional SOA signal and is used for separating an uplink burst optical signal and a downlink continuous optical signal which pass through the bidirectional SOA;
the gain control device is connected with the bidirectional SOA signal and is used for increasing the bias current of the SOA when the uplink burst optical signal exists and reducing the bias current of the SOA when the uplink burst optical signal does not exist.
7. The ONU-side bidirectional SOA automatic gain control system as claimed in claim 6, wherein:
the gain control device comprises a gate signal generator, a gain control device and a gain control device, wherein the gate signal generator is used for generating an envelope signal to control the transmission of an uplink burst data packet so as to control the generation of an uplink burst optical signal;
the gate signal generator also performs automatic gain control on bias current of the SOA through the envelope signal;
when the envelope signal is at a high level, an uplink burst data packet is sent, an uplink burst optical signal is generated, and the bias current of an SOA is increased;
when the envelope signal is at a low level, the transmission of the uplink burst data packet is disconnected, the generation of the uplink burst optical signal is stopped, and the bias current of the SOA is reduced.
8. The ONU-side bidirectional SOA automatic gain control system according to claim 6 or 7, wherein said gain control means is further adapted to:
and adjusting the bias current of the SOA based on the amplitude synchronization of the uplink burst optical signal.
9. The ONU-side bidirectional SOA automatic gain control system according to claim 6 or 7, wherein said gain control means is further adapted to:
and keeping the bias current change of the SOA synchronous with the arrival time of the uplink burst optical signal.
10. The ONU-side bidirectional SOA automatic gain control system as claimed in claim 7, wherein:
the signal separation device comprises a wavelength division multiplexing filter connected with the bidirectional SOA signal and an optical isolator connected with the wavelength division multiplexing filter signal.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310870714.7A CN116865899A (en) | 2023-07-14 | 2023-07-14 | ONU-end bidirectional SOA automatic gain control method and system |
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| CN202310870714.7A CN116865899A (en) | 2023-07-14 | 2023-07-14 | ONU-end bidirectional SOA automatic gain control method and system |
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