CN109728854B - Forward remote gain unit and remote pump amplifier - Google Patents
Forward remote gain unit and remote pump amplifier Download PDFInfo
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- CN109728854B CN109728854B CN201811385456.9A CN201811385456A CN109728854B CN 109728854 B CN109728854 B CN 109728854B CN 201811385456 A CN201811385456 A CN 201811385456A CN 109728854 B CN109728854 B CN 109728854B
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Abstract
The embodiment of the invention provides a forward remote gain unit and a remote pump amplifier, wherein the forward remote gain unit comprises a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer and an erbium-doped optical fiber; the common ends of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively connected with two ends of the erbium-doped fiber, and the reflection end of the second wavelength division multiplexer is connected with the common end of the third wavelength division multiplexer; the transmission end of the first wavelength division multiplexer is used for receiving the signal light and the associated pump light, and the reflection end of the first wavelength division multiplexer is used for receiving the bypass pump light; the transmission end of the second wavelength division multiplexer is used for outputting the amplified signal light; and the transmission end and the reflection end of the third wavelength division multiplexer are respectively used for receiving the bypass pump light. The forward remote gain unit and the remote pump amplifier provided by the embodiment of the invention realize bidirectional pumping, can effectively prolong the transmission distance of an ultra-long span optical fiber communication system, reduce the line laying cost, and have good performance stability and long service life.
Description
Technical Field
The embodiment of the invention relates to the technical field of optical communication, in particular to a forward remote gain unit and a remote pump amplifier.
Background
With the development of optical fiber communication technology, the ultra-long span optical transmission system needs to transmit over longer and longer distances, often hundreds of kilometers. In this case, the system power budget can be increased by extending the fiber transmission span using a remote pump amplifier.
The forward Remote pump amplifier is characterized in that a Remote Gain Unit (RGU) composed of an erbium-doped Fiber (EDF) as a Gain medium and related passive devices is introduced into a system transmission link, the RGU is placed inside a joint box, and a pumping source for providing pumping amplification is placed at a transmitting end of the transmission system. The signal light is amplified in the erbium-doped fiber, so that the output optical power of the transmission fiber is obviously improved. And because the RGU is a passive device, no power supply facility or personnel maintenance is needed at the point, the RGU is suitable for crossing the desert, plateau, lake, strait and other areas with inconvenient maintenance and power supply, and the daily maintenance cost is reduced.
The remote pump system comprises a channel-associated pump structure and a bypass pump structure, wherein the channel-associated pump structure is used for transmitting signal light and pump light in the same fiber core; the bypass pump structure is characterized in that signal light and pump light are transmitted between two fiber cores. In the channel associated pumping structure, the transmission system has a certain limitation on the pumping light intensity, the over-high pumping light can generate nonlinear effects such as stimulated brillouin and stimulated raman scattering, and after long-distance transmission, the power from the channel associated pumping light or the bypass pumping light to the remote gain unit is difficult to meet the requirement of the pumping power. The transmission distance that the remote gain unit can extend is very limited.
Disclosure of Invention
The embodiment of the invention provides a forward remote gain unit and a remote pump amplifier, which are used for solving the problem that the extendable distance of the conventional remote gain unit is limited.
In a first aspect, an embodiment of the present invention provides a forward remote gain unit, including a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer, and an erbium-doped fiber;
the common ends of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively connected with two ends of the erbium-doped fiber, and the reflection end of the second wavelength division multiplexer is connected with the common end of the third wavelength division multiplexer;
the transmission end of the first wavelength division multiplexer is used for receiving signal light and associated pump light, and the reflection end of the first wavelength division multiplexer is used for receiving bypass pump light; the transmission end of the second wavelength division multiplexer is used for outputting the amplified signal light; and the transmission end and the reflection end of the third wavelength division multiplexer are respectively used for receiving the bypass pump light.
In a second aspect, an embodiment of the present invention provides a forward remote pump amplifier, including the remote gain unit described in the first aspect, and a remote pump unit; the remote pumping unit is connected with the remote gain unit through an optical cable and is used for providing bypass pumping light and associated pumping light for the remote gain unit.
The forward remote gain unit and the remote pump amplifier provided by the embodiment of the invention realize bidirectional pumping by arranging three wavelength division multiplexers, based on forward pumping of one path of associated pumping light and one path of bypass pumping light to the erbium-doped fiber and based on reverse pumping of two paths of bypass pumping light to the erbium-doped fiber, can effectively prolong the transmission distance of the ultra-long span optical fiber communication system under the condition that system parameters are not influenced by changing a transmission coding mode, the fiber-entering optical power of a transmission link and the like, so that the laying of a long-distance optical communication optical cable is not required, the line laying cost is reduced, and the remote gain unit is a passive device, has good performance stability and long service life, and does not need later maintenance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a forward remote gain unit according to an embodiment of the present invention;
FIG. 2 is a schematic structural diagram of a forward remote pump amplifier according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a remote pumping unit according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of a forward remote pump amplifier according to another embodiment of the present invention;
fig. 5 is an optical power variation curve of the signal light and the channel-associated pump light in the channel-associated fiber core according to the embodiment of the present invention;
description of reference numerals:
11-a first wavelength division multiplexer; 11 a-the transmissive end of the first wavelength division multiplexer;
11 b-the reflective end of the first wavelength division multiplexer; 11c — the common of the first wavelength division multiplexer;
12-a second wavelength division multiplexer; 12 a-the transmissive end of the second wavelength division multiplexer;
12 b-a reflective end of the second wavelength division multiplexer; 12 c-a common terminal of a second wavelength division multiplexer;
13-a third wavelength division multiplexer; 13 a-the transmission side of the third wavelength division multiplexer;
13 b-the reflective end of the third wavelength division multiplexer; 13 c-a common terminal of a third wavelength division multiplexer;
14-erbium doped fiber; 1-a remote gain unit;
2-a remote pumping unit; 3-an optical cable;
21-a first bypass pump unit; 22-a second bypass pumping unit;
23-a third bypass pumping unit; 24-a channel pump unit;
31-a first bypass core; 32-a second bypass core;
33-a third bypass core; 34-follower core.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment of the invention provides a forward remote gain unit, aiming at the condition that the transmission distance which can be prolonged by a remote gain unit based on a channel associated pumping structure and a bypass pumping structure in the current remote pump system is very limited. Fig. 1 is a schematic structural diagram of a forward remote gain unit according to an embodiment of the present invention, and as shown in fig. 1, the forward remote gain unit includes a first wavelength division multiplexer 11, a second wavelength division multiplexer 12, a third wavelength division multiplexer 13, and an erbium-doped fiber 14. The common ends 11c and 12c of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively connected with two ends of the erbium-doped fiber 14, and the reflection end 12b of the second wavelength division multiplexer is connected with the common end 13c of the third wavelength division multiplexer; the transmission end 11a of the first wavelength division multiplexer is used for receiving the signal light and the associated pump light, and the reflection end 11b of the first wavelength division multiplexer is used for receiving the bypass pump light; the transmission end 12a of the second wavelength division multiplexer is used for outputting the amplified signal light; the transmission end 13a and the reflection end 13b of the third wavelength division multiplexer are respectively used for receiving the bypass pump light.
Specifically, the forward remote gain unit includes three wavelength division multiplexers, which are represented by a first wavelength division multiplexer 11, a second wavelength division multiplexer 12, and a third wavelength division multiplexer 13, respectively, for convenience of description. It should be noted that, the wavelength division multiplexers in the embodiments of the present invention are all three-port wavelength division multiplexers, and the three ports are respectively a transmission port, a reflection port, and a common port.
For the first wavelength division multiplexer 11, a transmission end 11a of the first wavelength division multiplexer is configured to receive signal light and channel associated pump light, where the signal light refers to service signal light transmitted by a transmitting end, and the channel associated pump light refers to pump light transmitted on the same fiber core as the signal light. The reflection end 11b of the first wavelength division multiplexer is used for receiving the bypass pump light, and the first wavelength division multiplexer combines the channel associated pump light input through the transmission end 11a and the bypass pump light input through the reflection end 11b, and outputs the combined pump light through the common end 11 c. Further, the signal light is also included which is output through the common terminal 11c of the first wavelength division multiplexer. The common end 11c of the first wavelength division multiplexer is connected with the input end of the erbium-doped fiber 14, and the channel-associated pump light and the bypass pump light are output through the common end 11c after being combined to perform forward pumping on the erbium-doped fiber 14.
For the third wavelength division multiplexer 13, both the transmission end 13a and the reflection end 13b of the third wavelength division multiplexer are configured to receive bypass pump light, where the bypass pump light entering the third wavelength division multiplexer 13 and the bypass pump light entering the first wavelength division multiplexer 11 may be from the same bypass pump unit or may be from different bypass pump units, and the bypass pump light entering the transmission end 13a of the third wavelength division multiplexer and the bypass pump light entering the reflection end 13b of the third wavelength division multiplexer may be from the same bypass pump unit or may be from different bypass pump units. The two bypass pump lights are respectively injected into a transmission end 13a and a reflection end 13b of the third wavelength division multiplexer, and then are combined in the third wavelength division multiplexer 13 and output through a common end 13c of the third wavelength division multiplexer. And a common end 13c of the third wavelength division multiplexer is connected with a reflection end 12b of the second wavelength division multiplexer 12, namely, the two bypass pump beams are combined and then transmitted to the reflection end 12b of the second wavelength division multiplexer.
For the second wavelength division multiplexer 12, a reflection end 12b of the second wavelength division multiplexer is configured to receive the two paths of combined bypass pump light, a common end 12c of the second wavelength division multiplexer is connected to an output end of the erbium-doped fiber 14, and the two paths of combined bypass pump light enter the erbium-doped fiber 14 from the common end 12c of the second wavelength division multiplexer to perform reverse pumping on the erbium-doped fiber 14. The transmission end 12a of the second wavelength division multiplexer outputs the signal light amplified by the bidirectional pump.
The remote gain unit provided by the embodiment of the invention realizes bidirectional pumping by arranging three wavelength division multiplexers, based on forward pumping of one path of associated pumping light and one path of bypass pumping light to the erbium-doped fiber and based on reverse pumping of two paths of bypass pumping light to the erbium-doped fiber, can effectively prolong the transmission distance of the ultra-long span optical fiber communication system under the condition of not changing the transmission coding mode, the fiber-in optical power of a transmission link and other system parameters, so that no cable needs to be laid for laying the long-distance optical communication cable, the line laying cost is reduced, and the remote gain unit is a passive device, has good performance stability and long service life and does not need later maintenance.
Based on the above embodiment, still include the opto-isolator, the output of opto-isolator is connected with the transmission end of first wavelength division multiplexer, and the input of opto-isolator is used for receiving signal light and along with the way pump light.
Specifically, the optical isolator is a passive optical device which is realized based on Faraday rotation non-reciprocity and only allows one-way light to pass through, has the characteristics of high isolation and low insertion loss, and can improve the light wave transmission efficiency. The optical isolator is additionally arranged in front of the transmission end of the first wavelength division multiplexer, so that the signal light and the channel associated pump light can not be attenuated, and the noise of the system caused by reflected light is reduced on the premise that the transmission end of the first wavelength division multiplexer can receive the signal light and the channel associated pump light.
Based on any one of the above embodiments, the insertion loss range between the transmission end and the common end of the first wavelength division multiplexer is 0.1-0.5 dB; the insertion loss range between the public end and the transmission end of the second wavelength division multiplexer is 0.1-0.5 dB.
Based on any one of the above embodiments, the isolation between the transmission end and the reflection end of the first wavelength division multiplexer is in a range of 30-50 dB; the isolation degree range between the reflection end and the transmission end of the third wavelength division multiplexer is 30-50 dB.
Based on any of the above embodiments, fig. 2 is a schematic structural diagram of a forward remote pump amplifier provided in an embodiment of the present invention, and as shown in fig. 2, the forward remote pump amplifier includes a remote gain unit 1 and a remote pumping unit 2; the remote pumping unit 2 is connected to the remote gain unit 1 through an optical cable 3, and the remote pumping unit 2 is configured to provide bypass pumping light and associated pumping light to the remote gain unit 1.
Specifically, the remote gain unit 1 is a forward remote gain unit in any of the above embodiments, and the remote pumping unit 2 is connected to the remote gain unit 1 through the optical cable 3 to supply pumping light to the remote gain unit 1. Further, referring to fig. 1, in the remote gain unit 1, a transmission end 11a of a first wavelength division multiplexer is configured to receive the associated pump light, a reflection end 11b of the first wavelength division multiplexer is configured to receive the bypass pump light, and a transmission end 13a and a reflection end 13b of a third wavelength division multiplexer are respectively configured to receive the bypass pump light. Accordingly, the remote pumping unit 2 needs to provide the associated pump light to the transmission end 11a of the first wavelength division multiplexer, the bypass pump light to the reflection end 11b of the first wavelength division multiplexer, and the bypass pump light to the transmission end 13a and the reflection end 13b of the third wavelength division multiplexer, respectively, through the optical cable 3. Here, the on-path pump light and the bypass pump light provided by the remote pump unit 2 may be from the same pump source, or may be from different pump sources, for example, two pump sources are included in the remote pump unit 2, one pump source is used for providing the on-path pump light, the other pump source is used for providing the bypass pump light, and the remote pump unit may further include four pump sources, one pump source is used for providing the on-path pump light, and the remaining three pump sources are respectively a port of the wavelength division multiplexer for providing the bypass pump light, which is not specifically limited in this embodiment of the present invention.
The forward remote pump amplifier provided by the embodiment of the invention comprises a remote gain unit 1 and a remote pump unit 2, wherein the remote gain unit 1 is provided with three wavelength division multiplexers, the erbium-doped fiber 14 is positively pumped based on one path of associated pump light and one path of bypass pump light, and the erbium-doped fiber 14 is reversely pumped based on two paths of bypass pump light, so that bidirectional pumping is realized, the transmission distance of an ultra-long span optical fiber communication system can be effectively prolonged under the condition that system parameters such as a transmission coding mode, the fiber-entering optical power of a transmission link and the like are not changed, the cable does not need to be laid when the long-distance optical communication optical cable is laid, the line laying cost is reduced, and the remote gain unit 1 is a passive device, has good performance stability and long service life and does not need to be maintained in a later period.
Based on any of the above embodiments, fig. 3 is a schematic structural diagram of a remote pumping unit provided in an embodiment of the present invention, and as shown in fig. 3, the remote pumping unit 2 includes an associated pumping unit 24, a first bypass pumping unit 21, a second bypass pumping unit 22, and a third bypass pumping unit 23; the optical fiber cable 3 includes a follower core 34, a first bypass core 31, a second bypass core 32, and a third bypass core 33. The channel following pumping unit 24 is connected with the transmission end of the first wavelength division multiplexer through a channel following fiber core 34, the first bypass pumping unit 21 is connected with the reflection end of the first wavelength division multiplexer through a first bypass fiber core 31, the second bypass pumping unit 22 is connected with the transmission end of the third wavelength division multiplexer through a second bypass fiber core 32, and the third bypass pumping unit 23 is connected with the reflection end of the third wavelength division multiplexer through a third bypass fiber core 33.
Specifically, in the remote pumping unit 2, the channel associated pumping unit 24, the first bypass pumping unit 21, the second bypass pumping unit 22, and the third bypass pumping unit 23 are four independent pumping sources, wherein the channel associated pumping unit 24 is connected to the transmission end of the first wavelength division multiplexer through the channel associated fiber core 34 to provide channel associated pumping light for the transmission end of the first wavelength division multiplexer. The first bypass pump unit 21 is connected to the reflection end of the first wavelength division multiplexer through the first bypass fiber core 31, and provides bypass pump light for the reflection end of the first wavelength division multiplexer. The second bypass pump unit 22 is connected to the transmission end of the third wavelength division multiplexer through the second bypass fiber core 32, and provides bypass pump light to the transmission end of the third wavelength division multiplexer. The third bypass pump unit 23 is connected to the reflection end of the third wavelength division multiplexer through the third bypass fiber core 33, and supplies bypass pump light to the reflection end of the third wavelength division multiplexer.
Based on any of the above embodiments, if the single channel rate of the signal light is 2.5Gb/s, 10Gb/s or 100Gb/s, the optical cable length L is as follows:
if the single channel rate of the signal light is 200Gb/s, the cable length L is as follows:
if the single channel rate of the signal light is 400Gb/s, the cable length L is as follows:
where α is a loss coefficient of the signal light, a unit of α is dB/km., i.e., lengths of the follower core, the first bypass core, the second bypass core, and the third bypass core, and a unit of the cable length L is km.
The remote pump amplifier provided by the embodiment of the invention is suitable for SDH (Synchronous Digital Hierarchy) and WDM (Wavelength Division Multiplexing) optical transmission systems with single channel rates of 2.5Gb/s, 10Gb/s, 100Gb/s, 200Gb/s and 400Gb/s, is suitable for coding modes such as intensity modulation and amplitude modulation, and is beneficial to smooth upgrading of the systems.
Based on any of the above embodiments, the channel associated pumping unit is connected to the transmission end of the first wavelength division multiplexer through the channel associated fiber core and the optical isolator, and the channel associated pumping unit is configured to perform raman amplification on the signal light and provide channel associated pumping light for the transmission end of the first wavelength division multiplexer.
Specifically, include the opto-isolator at remote gain unit, and the output of opto-isolator and the condition that first wavelength division multiplexer's transmission end was connected, the pumping unit along with the way need be connected with opto-isolator's input through the fibre core along with the way to realize the intercommunication of light path between pumping unit along with the way and the transmission end of first wavelength division multiplexer. Here, the channel pumping unit has not only a function of raman-amplifying the signal light but also a function of transmitting the signal light after raman amplification and the channel pumping light to the transmission end of the first wavelength division multiplexer. In the case where the remote gain unit does not include an optical isolator, the follower pump unit also has the function of raman-amplifying the signal light.
Based on any of the above embodiments, the wavelength range of the channel associated pump unit is 1465-1480 nm, the wavelength range of the first bypass pump unit is 1480-1500 nm, the wavelength range of the second bypass pump unit is 1480-1500 nm, and the wavelength range of the third bypass pump unit is 1465-1480 nm.
Based on any of the above embodiments, the pump light power ranges of the associated pump unit, the first bypass pump unit, the second bypass pump unit, and the third bypass pump unit are 30-37 dBm.
Based on any of the above embodiments, fig. 4 is a schematic structural diagram of a forward remote pump amplifier according to another embodiment of the present invention, as shown in fig. 4, the forward remote pump amplifier includes a remote gain unit 1 and a remote pumping unit 2, which are connected by an optical cable 3.
The remote pumping unit 2 includes an on-path pumping unit 24, a first bypass pumping unit 21, a second bypass pumping unit 22, and a third bypass pumping unit 23. The optical cable includes a follower core 34, a first bypass core 31, a second bypass core 32, and a third bypass core 33. The remote gain unit 1 comprises a first wavelength division multiplexer 11, a second wavelength division multiplexer 12, a third wavelength division multiplexer 13 and an erbium-doped fiber 14, wherein common ends 11c and 12c of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively connected with two ends of the erbium-doped fiber 14, and a reflection end 12b of the second wavelength division multiplexer is connected with a common end 13c of the third wavelength division multiplexer.
The channel following pump unit 24 is connected to the transmission end 11a of the first wavelength division multiplexer through the channel following fiber core 34, and provides channel following pump light for the transmission end 11a of the first wavelength division multiplexer. The first bypass pump unit 21 is connected to the reflection end 11b of the first wavelength division multiplexer through the first bypass fiber core 31, and supplies bypass pump light to the reflection end 11b of the first wavelength division multiplexer. The second bypass pump unit 22 is connected to the transmission end 13a of the third wavelength division multiplexer through the second bypass fiber core 32, and supplies bypass pump light to the transmission end 13a of the third wavelength division multiplexer. The third bypass pump unit 23 is connected to the reflection end 13b of the third wavelength division multiplexer through the third bypass core 33, and supplies bypass pump light to the reflection end 13b of the third wavelength division multiplexer. For the sake of distinction, the pump light emitted by the first bypass pump unit 21, the second bypass pump unit 22, and the third bypass pump unit 23 will be hereinafter referred to as first bypass pump light, second bypass pump light, and third bypass pump light, respectively.
The transmission end 11a of the first wavelength division multiplexer is used for receiving the signal light and the associated pump light, the reflection end 11b of the first wavelength division multiplexer is used for receiving the first bypass pump light, the associated pump light and the first bypass pump light are combined by the first wavelength division multiplexer 11 and output through the common end 11c, and forward pumping is carried out on the erbium-doped optical fiber 14.
And the transmission end 13a of the third wavelength division multiplexer is used for receiving the second bypass pump light, the reflection end 13b of the third wavelength division multiplexer is used for receiving the third bypass pump light, and the first bypass pump light and the second bypass pump light are respectively injected into the transmission end 13a and the reflection end 13b of the third wavelength division multiplexer, are subjected to wave combination in the third wavelength division multiplexer 13, are output through the common end 13c of the third wavelength division multiplexer and are transmitted to the reflection end 12b of the second wavelength division multiplexer. The combined second bypass pump light and third bypass pump light are input from the reflection end 12b of the second wavelength division multiplexer, enter the erbium-doped fiber 14 from the common end 12c of the second wavelength division multiplexer, and reversely pump the erbium-doped fiber 14.
In summary, the associated pump light and the first bypass pump light are combined by the first wavelength division multiplexer 11 and then pump the erbium-doped fiber 14 in the forward direction, and the second bypass pump light and the third bypass pump light are combined by the third wavelength division multiplexer 13 and then pump the erbium-doped fiber 14 in the reverse direction by the second wavelength division multiplexer 12, so as to form a bidirectional pump structure, thereby realizing amplification of signal light.
Based on any of the above embodiments, referring to fig. 4, the forward remote pump amplifier is provided, wherein the wavelength of the signal light for service transmission is 1550nm, and the nominal loss in the single-mode optical fiber is generally 0.2dB/km, and if the wavelength of the associated pump light output by the associated pump unit is 1480nm, the nominal loss of the associated pump light in the single-mode optical fiber is generally 0.223 dB/km. The channel following pumping unit injects 0dBm (1mW) of signal light into the channel following fiber core, and pumps 31dBm (1260mW) of channel following pumping light. The transmission equation of the signal light and the associated pump light is as follows:
in the formula, PsAnd PpPower, gamma, of signal light and associated pump light, respectivelysAnd gammapFrequency, A, of the signal light and the associated pump light, respectivelyeffis the cross-sectional area of the follower core, αsand alphapThe fiber loss coefficients g of the signal light and the associated pump light in the associated fiber coreRIs the raman gain coefficient and z is the transmission distance. The optical power variation curves of the signal light and the channel-associated pump light in the channel-associated fiber core can be obtained according to the formula, and fig. 5 is an optical power variation curve of the signal light and the channel-associated pump light in the channel-associated fiber core provided by the embodiment of the present invention. As can be seen from fig. 5, the optical power loss of the signal light when the channel pump light is present is smaller than the optical power change curve of the signal light when the channel pump light is absent.
For a remote pump amplifier which only comprises a channel associated pumping unit and does not comprise a bypass pumping unit, signal light of single wave 10G is sent at a sending end and enters a transmission optical fiber for transmission through the channel associated pumping unit, a remote gain unit is positioned 91km away from the channel associated pumping unit, the signal light enters the transmission optical fiber with the length of 100km for transmission after being amplified by the remote gain unit, and finally enters a receiving end. The power of the channel associated pumping light entering the remote gain unit is 10dBm, the noise index of the remote gain unit is 6dB, the gain of the remote gain unit is 8dB, the switch gain of the channel associated pumping unit is 21.6dB, and the signal-to-noise ratio of the obtained output light is 48 dB.
For a remote pump amplifier only comprising a channel associated pumping unit and a bypass pumping unit, signal light of single wave 10G is sent at a sending end and enters a transmission optical fiber for transmission through the channel associated pumping unit, a remote gain unit is located at a position 104km away from the remote pumping unit (comprising the channel associated pumping unit and the bypass pumping unit), the signal light enters the transmission optical fiber with the length of 100km for transmission after being amplified by the remote gain unit, and finally enters a receiving end. The power of the pump light entering the remote gain unit is 7dBm, the noise index of the remote gain unit is 6dB, the gain of the remote gain unit is 8dB, the switch gain of the channel-associated pump unit is 21.6dB, the switch gain is 21.74dB, and the signal-to-noise ratio of the output light is 45.7 dB.
For a remote pump amplifier comprising a channel associated pumping unit and two bypass pumping units, signal light of single wave 10G is sent at a sending end and enters a transmission optical fiber for transmission through the channel associated pumping unit, a remote gain unit is located at a position 112km away from the remote pumping unit (comprising the channel associated pumping unit and the two bypass pumping units), the signal light enters the transmission optical fiber with the length of 100km for transmission after being amplified by the remote gain unit, and finally enters a receiving end. The power of the pump light entering the remote gain unit is 5.3dBm, the noise index of the remote gain unit is 6dB, the gain of the remote gain unit is 8dB, the switch gain is 21.77dB, and the signal-to-noise ratio of the output light is 44.25 dB.
For a remote pump amplifier comprising a channel associated pumping unit and three bypass pumping units, signal light of single wave 10G is sent at a sending end and enters a transmission optical fiber for transmission through the channel associated pumping unit, a remote gain unit is located at a position 117.2km away from the remote pumping unit (comprising the channel associated pumping unit and the three bypass pumping units), the signal light enters the transmission optical fiber with the length of 100km for transmission after being amplified by the remote gain unit, and finally enters a receiving end. The power of the pump light entering the remote gain unit is 4dBm, the noise index of the remote gain unit is 6dB, the gain of the remote gain unit is 8dB, the switch gain is 21.79dB, and the signal-to-noise ratio of the output light is 43.26 dB.
Therefore, compared with the remote pump amplifier of the channel associated pump, the optical signal to noise ratio of the system can be improved by 4.74 dB; compared with the remote pump amplifier of the channel associated pump and the single bypass pump, the optical signal to noise ratio of the system can be improved by 2.44 dB; compared with the remote pump amplifier of the channel following pump and the double-bypass pump, the optical signal to noise ratio of the system can be improved by 1 dB.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the embodiments of the present invention, and are not limited thereto; although embodiments of the present invention have been described in detail with reference to the foregoing embodiments, those skilled in the art will understand that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A forward remote gain unit, comprising a first wavelength division multiplexer, a second wavelength division multiplexer, a third wavelength division multiplexer and an erbium doped fiber;
the common ends of the first wavelength division multiplexer and the second wavelength division multiplexer are respectively connected with two ends of the erbium-doped fiber, and the reflection end of the second wavelength division multiplexer is connected with the common end of the third wavelength division multiplexer;
the transmission end of the first wavelength division multiplexer is used for receiving signal light and associated pump light, and the reflection end of the first wavelength division multiplexer is used for receiving bypass pump light; the transmission end of the second wavelength division multiplexer is used for outputting the amplified signal light; and the transmission end and the reflection end of the third wavelength division multiplexer are respectively used for receiving the bypass pump light.
2. The remote gain unit according to claim 1, further comprising an optical isolator, an output of the optical isolator being coupled to a transmission terminal of the first wavelength division multiplexer, an input of the optical isolator being configured to receive the signal light and the on-path pump light.
3. The remote gain unit according to claim 1, wherein an insertion loss between the transmission terminal and the common terminal of the first wavelength division multiplexer ranges from 0.1 to 0.5 dB; and the insertion loss range between the public end and the transmission end of the second wavelength division multiplexer is 0.1-0.5 dB.
4. The remote gain unit according to claim 1, wherein an isolation between the transmission end and the reflection end of the first wavelength division multiplexer is in a range of 30-50 dB; and the isolation degree range between the reflection end and the transmission end of the third wavelength division multiplexer is 30-50 dB.
5. A forward remote pump amplifier comprising a remote gain unit as claimed in any one of claims 1 to 4, and a remote pump unit; the remote pumping unit is connected with the remote gain unit through an optical cable and is used for providing bypass pumping light and associated pumping light for the remote gain unit.
6. The remote pump amplifier of claim 5, wherein the remote pumping unit comprises an associated pumping unit, a first bypass pumping unit, a second bypass pumping unit, and a third bypass pumping unit;
the optical cable comprises a follow-up fiber core, a first bypass fiber core, a second bypass fiber core and a third bypass fiber core;
the channel following pumping unit is connected with the transmission end of the first wavelength division multiplexer through the channel following fiber core, the first bypass pumping unit is connected with the reflection end of the first wavelength division multiplexer through the first bypass fiber core, the second bypass pumping unit is connected with the transmission end of the third wavelength division multiplexer through the second bypass fiber core, and the third bypass pumping unit is connected with the reflection end of the third wavelength division multiplexer through the third bypass fiber core.
7. A remote pump amplifier according to claim 5, where if the single channel rate of the signal light is 2.5Gb/s, 10Gb/s, or 100Gb/s, the length L of the fiber optic cable is given by:
if the single-channel rate of the signal light is 200Gb/s, the length L of the optical cable is as follows:
if the single-channel rate of the signal light is 400Gb/s, the length L of the optical cable is as follows:
in the formula, α is a loss factor of the signal light.
8. A remote pump amplifier according to claim 6, wherein the optically pumped unit is coupled to the transmissive end of the first wavelength division multiplexer via the optically pumped core and an optical isolator, the optically pumped unit configured to Raman amplify the signal light and provide the optically pumped light to the transmissive end of the first wavelength division multiplexer.
9. A remote pump amplifier according to claim 6, wherein the wavelength range of the follower pump unit is 1465-1480 nm, the wavelength range of the first bypass pump unit is 1480-1500 nm, the wavelength range of the second bypass pump unit is 1480-1500 nm, and the wavelength range of the third bypass pump unit is 1465-1480 nm.
10. A remote pump amplifier according to claim 6, in which the pump optical power of the follower pump unit, the first bypass pump unit, the second bypass pump unit and the third bypass pump unit is in the range of 30-37 dBm.
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| EP1045535A2 (en) * | 1999-04-16 | 2000-10-18 | Nec Corporation | Optical amplifier equipment for WDM optical communication |
| CN1556438A (en) * | 2003-12-30 | 2004-12-22 | 武汉光迅科技有限责任公司 | Gain dsplacement type thulium aduterated optical fiber amplifier using spontaneous radiation light source as auxiliary pumping |
| CN108599851A (en) * | 2018-05-22 | 2018-09-28 | 武汉光迅科技股份有限公司 | A kind of single spanning distance optical transmission system and method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| EP1045535A2 (en) * | 1999-04-16 | 2000-10-18 | Nec Corporation | Optical amplifier equipment for WDM optical communication |
| CN1556438A (en) * | 2003-12-30 | 2004-12-22 | 武汉光迅科技有限责任公司 | Gain dsplacement type thulium aduterated optical fiber amplifier using spontaneous radiation light source as auxiliary pumping |
| CN108599851A (en) * | 2018-05-22 | 2018-09-28 | 武汉光迅科技股份有限公司 | A kind of single spanning distance optical transmission system and method |
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