CN112383357A - Power balancing device of space division multiplexing optical switching node - Google Patents

Power balancing device of space division multiplexing optical switching node Download PDF

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CN112383357A
CN112383357A CN202011126314.8A CN202011126314A CN112383357A CN 112383357 A CN112383357 A CN 112383357A CN 202011126314 A CN202011126314 A CN 202011126314A CN 112383357 A CN112383357 A CN 112383357A
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signals
optical
division multiplexing
edfa
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CN112383357B (en
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武保剑
江歆睿
钱悦
文峰
邱昆
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University of Electronic Science and Technology of China
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    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B10/00—Transmission systems employing electromagnetic waves other than radio-waves, e.g. infrared, visible or ultraviolet light, or employing corpuscular radiation, e.g. quantum communication
    • H04B10/29—Repeaters
    • H04B10/291—Repeaters in which processing or amplification is carried out without conversion of the main signal from optical form
    • H04B10/293—Signal power control
    • H04B10/294—Signal power control in a multiwavelength system, e.g. gain equalisation
    • H04B10/2941—Signal power control in a multiwavelength system, e.g. gain equalisation using an equalising unit, e.g. a filter
    • 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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Abstract

The invention discloses a power balancing device of a space division multiplexing optical switching node, which adopts a semi-analytic genetic optimization algorithm to quickly calculate the pump mode and power required by each FM-EDFA through a logic control module in a control unit according to the switch routing state of a space division multiplexing switching structure; then, the operation mode of the multimode pumping unit is changed through a mode distribution circuit, and the on-demand combination of the pumping modes is completed; and finally, compensating different switch routing losses in a single-mode optical switch matrix and the like by dynamically adjusting the mode gain of the FM-EDFA, so that the output optical power of each channel in the space division multiplexing optical switching node is balanced.

Description

Power balancing device of space division multiplexing optical switching node
Technical Field
The invention belongs to the technical field of optical communication, and particularly relates to a power balancing device of a space division multiplexing optical switching node.
Background
The optical fiber communication network has the transmission characteristics of low loss, large bandwidth, high speed and the like, and is an important support for telecommunication networks, computer networks and cable television networks. In recent years, with the rapid development of services such as the internet, the mobile internet, and cloud computing, the capacity of an optical fiber communication system has exponentially increased. At present, the capacity of an optical communication system approaches the non-linear shannon limit. In order to meet the rapidly increasing bandwidth demand, space division multiplexing has become a technology for further effectively improving the transmission capacity of optical fibers, and has great development potential in optical interconnection of data centers and long-distance optical communication networks, and the key point is the construction and implementation of space division multiplexing optical switching nodes. The silicon photonic switching chip scheme has the most competitive advantage, has the advantages of low power consumption, compatibility with a Complementary Metal Oxide Semiconductor (CMOS) process and the like, and can meet the switching requirement of continuously increasing capacity in an optical communication transmission system and a data center.
On the other hand, as the capacity of the space division multiplexing optical fiber increases, the core node construction compatible with the space division multiplexing granularity switching is also an early matter. However, as the switching scale increases or the number of ports increases, the change of the routing state of the optical switching chip may cause the insertion loss performance of different switch routes to be rapidly degraded, so that the difference of the output optical power of each channel passing through the optical switching node increases, and finally the networking performance of the optical switching fabric may be limited. By optimizing the topological structure of the optical switching chip, the performance difference caused by the switch routing can be reduced to a certain extent. However, in the actual optical switch, there is always a difference in insertion loss in both the parallel and cross states. Therefore, only by adopting a proper power balancing device, the silicon photonic switching chip can be really applied to a data center or an optical transmission network.
At present, under the drive of the space division multiplexing technology, the proposed space division multiplexing optical switching node has higher construction cost and poorer realizability, and more importantly, the space division multiplexing optical switching node does not have a power balancing function, so that the space division multiplexing optical switching node is difficult to apply to an actual network.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a power balancing device of an optical switch node for space division multiplexing, which solves the problem of power imbalance of mode channels in a large-scale optical switch node by compensating the route related loss of an optical switch system for space division multiplexing so as to realize power balancing of the whole optical switch node.
To achieve the above object, a power equalization apparatus for a space division multiplexing optical switching node according to the present invention includes: the system comprises a control unit, a space division multiplexing optical exchange structure and an erbium-doped fiber amplifier FM-EDFA array;
the control unit consists of a logic control module, a switch driving circuit, a power monitoring module and a mode distribution circuit which are controlled by the logic control module; the switch driving circuit is used for completing the switch state setting of a single-mode optical switch matrix in the space division multiplexing optical switching structure; the power monitoring module comprises a digital-to-analog D/A converter, a MN multiplied by 1 selection switch, a PIN diode and an analog-to-digital A/D converter and is mainly used for monitoring the switch routing loss or the output signal light power of all mode channels; the mode distribution circuit is used for adjusting the multimode pumping units to complete the combination of pumping modes according to requirements, thereby realizing the dynamic adjustment of FM-EDFA on the gains of signals in different modes;
the space division multiplexing optical switching structure consists of N1 multiplied by M mode conversion demultiplexers, a single mode optical switch matrix and N M multiplied by 1 mode conversion multiplexers;
the FM-EDFA array consists of N FM-EDFAs and multimode pumping units shared by the N FM-EDFAs, and mainly realizes dynamic gain compensation; the multimode pumping unit consists of L single-mode pumping lasers, L-1 phase plates, L electrically adjustable light distributors and N combiners;
sequentially accessing N few-mode fibers to N1 xM mode conversion demultiplexers, and outputting by corresponding N FM-EDFAs, wherein each few-mode fiber supports the propagation of M mode signals;
the logic control module operates a corresponding routing algorithm according to the optical switching connection requirement, determines the optical switching state of the space division multiplexing optical switching structure, and controls the switch driving circuit to complete the configuration of the single-mode optical switch matrix; n multi-mode signals are converted into NM single-mode signals through N1 xM mode conversion demultiplexers and then input into a single-mode optical switch matrix; the single-mode optical switch matrix feeds back NM single-mode signals to the power monitoring module, outputs the NM single-mode signals to N M multiplied by 1 mode conversion multiplexers simultaneously, converts the NM single-mode signals into N multi-mode signals through the N M multiplied by 1 mode conversion multiplexers, and inputs the N multi-mode signals into an FM-EDFA array;
in the power monitoring module, a logic control module controls an MN multiplied by 1 selective switch through a digital-to-analog D/A converter, and scans and monitors NM single-mode signals output by a single-mode optical switch matrix to generate monitoring optical signals, then the monitoring optical signals are converted into electric signals through a PIN diode, and finally the electric signals are fed back to the logic control module through the conversion of an analog-to-digital A/D converter, so that the insertion loss of the single-mode optical switch matrix in different routing states is dynamically monitored;
in the FM-EDFA array, a logic control module adopts a semi-analytic genetic optimization algorithm to quickly calculate pump light modes and powers required by N FM-EDFAs according to insertion loss under different routing states, and a mode distribution circuit regulates output power of L single-mode pump lasers and splitting ratio of L electrically-adjustable light distributors in a multi-mode pump unit to complete combination of the pump modes as required; then, each pump laser generates a base mode pump light, the back L-1 base mode pump lights are converted into high-order spatial mode pump lights through a connected phase plate, only the first base mode pump light is reserved, and then each beam of pump light is input to the electrically adjustable light distributor; in the electric adjustable optical distributor, according to the pump light modes needed by N FM-EDFAs, splitting the pump light of each mode into N combiners according to the needed proportion, and inputting the pump light of each mode into the corresponding FM-EDFA by each combiner; in each FM-EDFA, multimode signals and combined mode pump light are simultaneously injected into the FM-EDFs through couplers, the FM-EDFs amplify the mode signals to the same power and output the signals, and then filters the pump light through filters to realize mode gain balance.
The invention aims to realize the following steps:
the invention relates to a power balancing device of a space division multiplexing optical switching node, which adopts a semi-analytic genetic optimization algorithm to quickly calculate the pumping mode and power required by each FM-EDFA through a logic control module in a control unit according to the switch routing state of a space division multiplexing switching structure; then, the operation mode of the multimode pumping unit is changed through a mode distribution circuit, and the on-demand combination of the pumping modes is completed; and finally, compensating different switch routing losses in a single-mode optical switch matrix and the like by dynamically adjusting the mode gain of the FM-EDFA, so that the output optical power of each channel in the space division multiplexing optical switching node is balanced.
Meanwhile, the power balancing device of the space division multiplexing optical switching node of the invention also has the following beneficial effects:
(1) the invention can adaptively and dynamically adjust the corresponding FM-EDFA gain, effectively compensate the routing related loss of multimode signals in different switch states, and realize the power balance of the whole optical switching node;
(2) the scheme of sharing the multimode pumping unit is adopted, mode conversion is realized by sharing the multimode pumping unit and using the fixed phase plate, the flexible combination of the mode components of the required pumping light can be realized, the realization is easy, and the cost of the device is greatly reduced;
(3) the invention adopts a semi-analytic genetic optimization algorithm in the control unit, can quickly calculate the pump mode combination and the power thereof required by an erbium-doped fiber amplifier (FM-EDFA) array, and quickens the flexible combination of the required pump mode components;
(4) the device can be combined with wavelength division multiplexing to realize an optical switching structure compatible with mode division multiplexing and wavelength division multiplexing, becomes a power balancing device of an optical switching node with multiple granularities, and realizes flexible upgrading and updating of the device.
Drawings
Fig. 1 is an architecture diagram of a power balancing apparatus for an sdm optical switching node according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of an 8 × 8 Switch Select (Switch-and-Select) configuration based on a Mach-Zehnder interferometer (MZI);
FIG. 3 is a schematic diagram of a power monitoring module;
FIG. 4 is a schematic diagram of an FM-EDFA array.
Detailed Description
The following description of the embodiments of the present invention is provided in order to better understand the present invention for those skilled in the art with reference to the accompanying drawings. It is to be expressly noted that in the following description, a detailed description of known functions and designs will be omitted when it may obscure the subject matter of the present invention.
Examples
Fig. 1 is an architecture diagram of a power balancing apparatus for an sdm optical switching node according to an embodiment of the present invention.
In this embodiment, as shown in fig. 1, a power equalization apparatus for a spatial division multiplexing optical switching node according to the present invention includes: the system comprises a control unit, a space division multiplexing optical exchange structure and an erbium-doped fiber amplifier FM-EDFA array;
as shown in fig. 1, the control unit is composed of a logic control module, a switch driving circuit under the control of the logic control module, a power monitoring module and a mode distribution circuit; the switch driving circuit is used for completing the switch state setting of a single-mode optical switch matrix in the space division multiplexing optical switching structure; the power monitoring module comprises a digital-to-analog D/A converter, a MN multiplied by 1 selection switch, a PIN diode and an analog-to-digital A/D converter and is mainly used for monitoring the switch routing loss or the output signal light power of all mode channels; the mode distribution circuit is used for adjusting the multimode pumping units to complete the combination of pumping modes according to requirements, thereby realizing the dynamic adjustment of FM-EDFA on the gains of signals in different modes;
the space division multiplexing optical switching structure consists of N1 multiplied by M mode conversion demultiplexers, a single mode optical switch matrix and N M multiplied by 1 mode conversion multiplexers;
the FM-EDFA array consists of N FM-EDFAs and multimode pumping units shared by the FM-EDFAs, and the scheme of sharing the multimode pumping units has the advantages of low cost and easy realization, and mainly realizes dynamic gain compensation; the multimode pumping unit consists of L single-mode pumping lasers, L-1 phase plates, L electrically adjustable light distributors and N combiners;
in this embodiment, the power equalization apparatus of the space division multiplexing optical switching node has N multimode fibers for input and output, each multimode fiber supports propagation of M mode signals, as shown in fig. 1, the N multimode fibers are sequentially connected to N1 × M mode conversion demultiplexers, and then output to the N multimode fibers through corresponding N FM-EDFAs;
the logic control module operates a corresponding routing algorithm according to the optical switching connection requirement, determines the optical switching state of the space division multiplexing optical switching structure, and controls the switch driving circuit to complete the configuration of the single-mode optical switch matrix;
in the space division multiplexing optical switching structure, M mode signals of each optical fiber are converted into M single mode signals through a 1 × M mode conversion demultiplexer, so that for the input condition of N few-mode optical fibers, N multimode signals are converted into NM single mode signals through N1 × M mode conversion demultiplexers, and then input into a single mode optical switch matrix, the optical signals are switched by adopting the currently realizable single mode optical switch matrix, and the switching matrix scale of the single mode optical switch matrix should not be lower than MN × MN. The single-mode optical switch matrix feeds back NM single-mode signals to the power monitoring module, outputs the NM single-mode signals to N M multiplied by 1 mode conversion multiplexers simultaneously, converts the NM single-mode signals into N multi-mode signals through the N M multiplied by 1 mode conversion multiplexers, and inputs the N multi-mode signals into an FM-EDFA array;
in this embodiment, before the optical signal is input into the FM-EDFA array, the logic control module needs to obtain the loss information related to the switch routing. In this embodiment, the logic control module provides two ways to obtain the switch routing loss information. The first way is that the routing correlation loss is directly calculated according to the topological structure of the single-mode optical switch matrix, the loss of the Cross (Cross) state and the parallel (Bar) state of the optical switch basic units, the routing information, and the number of the optical switch basic units in the Cross (Cross) state and the parallel (Bar) state in the single-mode optical switch matrix from the input port to the output port of each signal; the second way is that at the output end of the single-mode optical switch matrix, the power of each output signal is detected by the power monitoring module, and the route correlation loss of each signal is indirectly measured. In the following, we will explain the second mode in detail, specifically: in the power monitoring module, a logic control module controls an MN multiplied by 1 selective switch through a digital-to-analog D/A converter, and scans and monitors NM single-mode signals output by a single-mode optical switch matrix to generate monitoring optical signals, then the monitoring optical signals are converted into electric signals through a PIN diode, and finally the electric signals are fed back to the logic control module through the conversion of an analog-to-digital A/D converter, so that the insertion loss of the single-mode optical switch matrix in different routing states is dynamically monitored;
in this embodiment, if the power equalization apparatus of the space division multiplexing optical switching node performs power equalization on the wavelength division multiplexing signal, as shown in fig. 3, a central wavelength tunable filter may be added in the power monitoring module to perform wavelength selection, so as to upgrade the apparatus to a power equalization apparatus of a multi-granularity optical switching node.
In the FM-EDFA array, the logic control module uses a half-analytic genetic optimization algorithm to quickly calculate the pump light modes and powers required by N FM-EDFAs according to the insertion loss under different routing states, and in this embodiment, the core of the half-analytic genetic optimization algorithm is to combine the half-analytic method of the FM-EDFA with the genetic optimization algorithm: the half-analysis method is an FM-EDFA calculation method which can replace the complete solution of an EDFA differential equation set by the inversion population concentration in the erbium-doped fiber according to an input signal and an input pump and complete the rapid and accurate calculation of the signal gain by a larger iteration step length; according to the route correlation loss, the mode and the power of the pump light required by the FM-EDFA for amplifying the input signal to the same power can be rapidly calculated in an optimized mode by combining a semi-analytical method and a genetic optimization algorithm;
as shown in fig. 4, the mode splitter circuit readjusts the output powers of the L single-mode pump lasers and the splitting ratios of the L electrically tunable optical splitters in the multimode pump unit to complete the on-demand combination of the pump modes; then, each pump laser generates a base mode pump light, the back L-1 base mode pump lights are converted into high-order spatial mode pump lights through a connected phase plate, only the first base mode pump light is reserved, and then each beam of pump light is input to the electrically adjustable light distributor; in the electric adjustable optical distributor, according to the pump light modes needed by N FM-EDFAs, splitting the pump light of each mode into N combiners according to the needed proportion, and inputting the pump light of each mode into the corresponding FM-EDFA by each combiner; in each FM-EDFA, multimode signals and combined mode pump light are simultaneously injected into the FM-EDFs through couplers, the FM-EDFs amplify the mode signals to the same power and output the signals, and then filters the pump light through filters to realize mode gain balance.
A specific example of the power balancing apparatus for space division multiplexing optical switching nodes is described in further detail below.
(1) The space division multiplexing signals for realizing optical switching are input or output by two three-mode few-mode optical fibers (N is 2, M is 3), as shown in fig. 1; each few-mode fiber supports LP01、LP11,e、LP11,oThe input optical powers of the three linear polarization modes are all-10 dBm, and the output optical powers of the three linear polarization modes are required to be balanced to 0 dBm.
(2) The single-mode optical Switch matrix employs an 8 × 8 Switch-and-Select (Switch-and-Select) structure based on a mach-zehnder interferometer (MZI), as shown in fig. 2. For each MZI switch cell, the insertion loss in the parallel (Bar) state is 0.5dB, and the insertion loss in the Cross (Cross) state is 1 dB. In order to highlight the main implementation process of the present invention, the insertion loss of other optical devices such as the mode division multiplexer, etc. is not considered in this embodiment.
(3) In the multimode pumping unit, 10 LPs are designed01The mode pump laser (L is 10, and can be reduced according to specific conditions), and the power range of each pump laser is 0-0.1W; converting the modes of 9 of the pump lasers into LP by using 9 different phase plates11,e、LP11,o、LP21,e、LP21,o、LP02、LP31,e、LP31,o、LP12,e、LP12,o. Also 10 electrically tunable optical splitters are required. There are 2 few-mode fibers as input, and accordingly 2 combiners are required.
(4) The FM-EDFA array comprises two FM-EDFAs, and the parameters of the two few-mode erbium-doped fibers (FM-EDFAs) are the same, wherein the length of the FM-EDFAs is 10m, the radius of the fiber core is 10 mu m, the doping radius is 10 mu m, and the uniform doping concentration is 1 multiplied by 1024m-3。
For the space division multiplexing switching node, the information that the input port is required to be switched and connected to the output port is I1→O1、I2→O4、I3→O5、I4→O2、I5→O6、I6→O3The remaining two input/output ports of the single-mode optical switch matrix may be used for finer-grained wavelength switching. Specifically, the three-mode signals in the first few-mode fiber are respectively demultiplexed to the input port I through the mode conversion demultiplexer 11、I2And I3Then switched to output port O by the single mode optical switch matrix1、O4And O5(ii) a The three-mode signals in the second few-mode optical fiber are respectively demultiplexed to the input port I through the mode conversion demultiplexer 24、I5And I6Then switched to output port O by the single mode optical switch matrix2、O6And O3. Port O1、O2And O3Is re-multiplexed into LP by the mode conversion multiplexer 101、LP11,eAnd LP11,oInputting the three-mode signal into FM-EDFA-1; port O4、O5And O6Is re-multiplexed into a further LP via the mode conversion multiplexer 201、LP11,eAnd LP11,oThe three-mode signal is then input into FM-EDFA-2.
Next, a specific implementation procedure is described with respect to the above space division multiplexing switching requirement.
(1) Firstly, according to the switching requirement, the logic control module operates a corresponding routing algorithm to determine the switching state of the space division multiplexing optical switching structure. For the Switch-and-Select structure, the Switch state on each route can be determined by adopting a single-path routing algorithm, and then the setting of the single-mode optical Switch matrix is completed by controlling a Switch driving circuit.
(2) According to the routing information and the insertion loss of the MZI optical switch unit in different states, the logic control module calculates the related loss of all routes of the single-mode optical switch matrix, I1→O1、I4→O2、I6→O3、I2→O4、I3→O5And I5→O6The switch routing loss of (1) is 5.5dB, 4.5dB, 4dB and 3dB in sequence. The single-mode optical switch matrix can also be monitored by the power monitoring moduleThe logic control module controls the 6 x 1 selective switch through the D/A converter in the power monitoring module, respectively scans and monitors the 6 output ports, and after the monitoring optical signal is converted into an electric signal by the PIN diode, the electric signal is fed back to the logic control module through the A/D converter to obtain O1～O6The optical power of the ports are-15.5 dBm, -14.5 dBm, -14 dBm, and-13 dBm, respectively.
(3) And according to the routing correlation loss, the logic control module uses a semi-analytic genetic optimization algorithm to quickly calculate the mode and the power required by each FM-EDFA. The pump optical mode set required for FM-EDFA-1 to equalize the output power to 0dBm comprises LP01、LP11,e、LP11,o、LP02、LP31,o、LP12,e、LP12,oThe power is 0.05W, 0.04W, 0.05W, 0.03W, 0.035W and 0.05W respectively; the pump light module required by FM-EDFA-2 comprises LP01、LP11,e、LP02、LP31,o、LP12,e、LP12,oThe power is 0.05W, 0.015W, 0.045W, 0.05W and 0.045W respectively.
(4) And calculating the emission power of each pump laser in the multimode pump unit and the splitting ratio of the electric adjustable light distributor. According to the parameters, the emission power of 10 pump lasers is 0.1W, 0.04W, 0W, 0.065W, 0W, 0.075W, 0.085W and 0.095W in sequence, and the proportion of 10 electrically adjustable light distributors is 1:1, 1:0, 10:3, 0, 2:3, 7:10 and 10:9 in sequence. According to the parameters, the logic control module adjusts the pump laser and the electric adjustable optical distributor through the mode distribution circuit, and then forms two FM-EDFAs by means of the combiner to obtain the required multimode combined pump light.
(5) And respectively sending the two groups of multimode combined pump lights into corresponding FM-EDFAs to realize gain compensation of the corresponding modes and power balance of the whole optical switching node. At this time, the three mode gains of FM-EDFA-1 are respectively 15.5dB, 14.5dB and 14.5dB, and the three mode gains of FM-EDFA-2 are respectively 14.7dB, 14.2dB and 13.2 dB. Obviously, when the route correlation loss of the single-mode optical switch matrix is compensated, each mode signal of the multimode signal is amplified to the same power, and the purpose of power balance can be achieved.
Although illustrative embodiments of the present invention have been described above to facilitate the understanding of the present invention by those skilled in the art, it should be understood that the present invention is not limited to the scope of the embodiments, and various changes may be made apparent to those skilled in the art as long as they are within the spirit and scope of the present invention as defined and defined by the appended claims, and all matters of the invention which utilize the inventive concepts are protected.

Claims (3)

1. A power equalization apparatus for a spatial division multiplexing optical switching node, comprising: the system comprises a control unit, a space division multiplexing optical exchange structure and an erbium-doped fiber amplifier FM-EDFA array;
the control unit consists of a logic control module, a switch driving circuit, a power monitoring module and a mode distribution circuit which are controlled by the logic control module; the switch driving circuit is used for completing the switch state setting of a single-mode optical switch matrix in the space division multiplexing optical switching structure; the power monitoring module comprises a digital-to-analog D/A converter, a MN multiplied by 1 selection switch, a PIN diode and an analog-to-digital A/D converter and is mainly used for monitoring the switch routing loss or the output signal light power of all mode channels; the mode distribution circuit is used for adjusting the multimode pumping units to complete the combination of pumping modes according to requirements, thereby realizing the dynamic adjustment of FM-EDFA on the gains of signals in different modes.
The space division multiplexing optical switching structure consists of N1 multiplied by M mode conversion demultiplexers, a single mode optical switch matrix and N M multiplied by 1 mode conversion multiplexers;
the FM-EDFA array consists of N FM-EDFAs and multimode pumping units shared by the N FM-EDFAs, and mainly realizes dynamic gain compensation; the multimode pumping unit consists of L single-mode pumping lasers, L-1 phase plates, L electrically adjustable light distributors and N combiners;
sequentially accessing N few-mode fibers to N1 xM mode conversion demultiplexers, and outputting by corresponding N FM-EDFAs, wherein each few-mode fiber supports the propagation of M mode signals;
the logic control module operates a corresponding routing algorithm according to the optical switching connection requirement, determines the optical switching state of the space division multiplexing optical switching structure, and controls the switch driving circuit to complete the configuration of the single-mode optical switch matrix; n multi-mode signals are converted into NM single-mode signals through N1 xM mode conversion demultiplexers and then input into a single-mode optical switch matrix; the single-mode optical switch matrix feeds back NM single-mode signals to the power monitoring module, outputs the NM single-mode signals to N M multiplied by 1 mode conversion multiplexers simultaneously, converts the NM single-mode signals into N multi-mode signals through the N M multiplied by 1 mode conversion multiplexers, and inputs the N multi-mode signals into an FM-EDFA array;
in the power monitoring module, a logic control module controls an MN multiplied by 1 selective switch through a digital-to-analog D/A converter, and scans and monitors NM single-mode signals output by a single-mode optical switch matrix to generate monitoring optical signals, then the monitoring optical signals are converted into electric signals through a PIN diode, and finally the electric signals are fed back to the logic control module through the conversion of an analog-to-digital A/D converter, so that the insertion loss of the single-mode optical switch matrix in different routing states is dynamically monitored;
in the FM-EDFA array, a logic control module adopts a semi-analytic genetic optimization algorithm to quickly calculate pump light modes and powers required by N FM-EDFAs according to insertion loss under different routing states, and a mode distribution circuit regulates output power of L single-mode pump lasers and splitting ratio of L electrically-adjustable light distributors in a multi-mode pump unit to complete combination of the pump modes as required; then, each pump laser generates a base mode pump light, the back L-1 base mode pump lights are converted into high-order spatial mode pump lights through a connected phase plate, only the first base mode pump light is reserved, and then each beam of pump light is input to the electrically adjustable light distributor; in the electric adjustable optical distributor, according to the pump light modes needed by N FM-EDFAs, splitting the pump light of each mode into N combiners according to the needed proportion, and inputting the pump light of each mode into the corresponding FM-EDFA by each combiner; in each FM-EDFA, multimode signals and combined mode pump light are simultaneously injected into the FM-EDFs through couplers, the FM-EDFs amplify the mode signals to the same power and output the signals, and then filters the pump light through filters to realize mode gain balance.
2. The apparatus of claim 1 wherein the size of the single-mode optical switch matrix is not less than MN x MN.
3. The apparatus according to claim 1, wherein the insertion loss of the single-mode optical switch matrix in different routing states can also directly calculate the routing correlation loss according to the topology of the single-mode optical switch matrix, the loss of the cross state and the parallel state of the optical switch basic units, routing information, and the number of the optical switch basic units in the cross state and the parallel state of each signal passing through the single-mode optical switch matrix from the input port to the output port.
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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022228034A1 (en) * 2021-04-25 2022-11-03 华为技术有限公司 Optical signal amplification apparatus and method
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