CN105681932B - A kind of optical switch for supporting extensive, full light network - Google Patents
A kind of optical switch for supporting extensive, full light network Download PDFInfo
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- CN105681932B CN105681932B CN201610199688.XA CN201610199688A CN105681932B CN 105681932 B CN105681932 B CN 105681932B CN 201610199688 A CN201610199688 A CN 201610199688A CN 105681932 B CN105681932 B CN 105681932B
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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
- H04Q11/0003—Details
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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
- H04B10/25—Arrangements specific to fibre transmission
- H04B10/2589—Bidirectional transmission
- H04B10/25891—Transmission components
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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
- H04Q11/0005—Switch and router aspects
-
- 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
- H04Q11/0005—Switch and router aspects
- H04Q2011/0007—Construction
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04Q—SELECTING
- H04Q2213/00—Indexing scheme relating to selecting arrangements in general and for multiplex systems
- H04Q2213/13295—Wavelength multiplexing, WDM
Abstract
The invention discloses a kind of optical switch for supporting extensive, full light network, including four corners of the world four direction interface, each direction N number of optical fiber interface, for being interconnected between optical switch；Further include：(1) four identical erbium-doped fiber amplifier (EDFA), (2) N+1 5:5 fiber optic splitters (5:5splitter), (3) wavelength division multiplexer (MUX), (4) solution wavelength division multiplexer (DEMUX), (5) fiber coupler (Coupler), (6) 2 N/2*1 wavelength-selective switches (WSS), 2 N*1 wavelength-selective switches, (7) M bidirectional optical fiber interface (fiber), it is attached by optical fiber with ToR interchangers, (8) 2 (N 2) a identical 1:N fiber optic splitters (1:N splitter), (9) control port (Console).Network based on optical switch composition can support large-scale data center ToR to interconnect, and point-to-point optical link can be established between arbitrary ToR, reduce network transmission delay, while also improving the flexibility of optical switching network.
Description
Technical field
The invention belongs to network architecture fields, can especially support the optical switch of large-scale data central site network.
Background technology
With the development of the technologies such as cloud computing, big data, the scale of data center is increasing.Conventional data centers network
The problems such as mainly using tree network topology, facing over-booking, network congestion.In recent years, the Dynamic Networks based on optical switch
Network research increases.Optical switch can dynamically change the connection type of network, establish link as desired, greatly reduce net
The deployment cost of network, promotes the performance of network.
Commercial optical switch is mainly based upon microelectromechanical-systems (Micro-electromechanical at present
System, MEMS) and wavelength-selective switches (Wave Selection Switch, WSS) optical switch.Light based on MEMS
Interchanger uses micro mirror array, the eyeglass in array being held by micro electronmechanical control mode between input port and output port
Arbitrarily change angle between mouthful to change the transmission direction of light beam, which problems faced, which is optical switch port number, to be had
Limit cannot support extensive full optical interconnection network.Pass through WSS waves based on wavelength-selective switches and wavelength-division multiplex technique optical switch
Long selecting switch controls internetwork connection mode.What CoAdna companies of the U.S. used is handed over based on the light of WSS and wavelength-division multiplex technique
It changes planes and is connected by way of 2D-Mesh, which can support that extensive cabinet top interchanger (Top of Rack, ToR) is mutual
Even, the ToR communications but on 2D-Mesh different directions have to pass through opto-electronic conversion and enter ToR forwardings, cannot directly establish a little
To the optical link of point.This mode increases the delay of network transmission, while also limiting the flexibility of optical switching network.
Invention content
In order to overcome the disadvantages of the above prior art, it is an object of the invention to design a kind of to support extensive node, energy
Enough optical switch that point-to-point optical link is established between arbitrary ToR.The technical solution adopted in the present invention is selected based on wavelength
The framework for selecting switch and wavelength-division multiplex technique passes through and increases wavelength-selective switches component in optical switch so that arbitrary ToR it
Between can establish an optical link, without being subjected to ToR forward.
In order to realize that said program, technical solution of the present invention are as follows：
As shown in Figure 1, the present invention supports that the optical switch of extensive full light network includes：(1) four identical to mix
Doped fiber amplifier (EDFA), (2) N+1 5:5 fiber optic splitters (5:5splitter), splitting ratio is 5 in both direction:5,
(3) wavelength division multiplexer (MUX), (4) solve wavelength division multiplexer (DEMUX), (5) fiber coupler (Coupler), (6) 2 N/2*1
Wavelength-selective switches (WSS), 2 N*1 wavelength-selective switches (WSS), (7) M bidirectional optical fiber interface (fiber), (8) 2 (N-2)
A identical 1:N fiber optic splitters (1:N splitter), the splitting ratio of the same direction and vertical direction is 1:N, wherein N
For integer, N is determined by wavelength-selective switches, (9) control port (Console).
The present invention supports that the optical switch of extensive full light network includes four corners of the world four direction interface, and each direction has
N number of optical fiber interface, for being interconnected between optical switch, N number of south interface is denoted as the 1st southern interface S respectively1..., the i-th south
Interface Si..., the south N interface SN, N number of north interface is denoted as the 1st northern interface N respectively1..., the i-th northern interface Ni、…、
The north N interface NN, N number of east interface is denoted as the 1st east interface E respectively1..., the i-th east interface Ei..., the east N interface
EN, N number of west interface is denoted as the 1st west interface W respectively1..., the i-th west interface Wi..., the wests N interface WN, i is integer,
1≤i≤N；Including M bidirectional optical fiber interface, is attached by optical fiber with ToR interchangers, is denoted as the 1st transceiver interface respectively
P1..., kth meets transceiver interface Pk..., M transceiver interfaces PM, k is integer, 1≤k≤M.
Four erbium-doped fiber amplifiers are denoted as the first erbium-doped optical fiber amplifier EDFA respectively1, the second erbium-doped fiber amplifier
EDFA2, third erbium-doped optical fiber amplifier EDFA3, the 4th erbium-doped optical fiber amplifier EDFA4。
2 N/2*1 wavelength-selective switches are denoted as first wave length selecting switch WSS respectively1, second wave length selecting switch WSS2,
2 N*1 wavelength-selective switches are denoted as third wavelength-selective switches WSS respectively3, the 4th wavelength-selective switches WSS4。
N+1 (5:5) fiber optic splitter is denoted as the 1st (5 respectively:5) fiber optic splitter ..., s (5:5) fiber beam splitting
Device ..., N (5:5) fiber optic splitter, (N+1) (5:5) fiber optic splitter, 1≤s≤N, s are integer, s (5:5) optical fiber
Beam splitter formalization representation is (5:5)Splitters。
2 (N-2) a 1:N fiber optic splitters are denoted as the 1st (1 respectively:N) fiber optic splitter ..., t (1:N) fiber beam splitting
Device ..., the 2nd (N-2) (1:N) fiber optic splitter, t are integer, 1≤t≤2 (N-2), t (1:N) fiber optic splitter formalizes table
It is shown as (1:N)Splittert。
1st to (N-2) (1:N) fiber optic splitter is located at North and South direction, and n-th (1:N) input terminal of fiber optic splitter with
N-th northern interface NnIt is connected, the southern interface S of the output port and n-th+2 that splitting ratio is Nn+2It is connected, 1≤n≤N-2, n are whole
Number, when n is even number, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14Phase
Even, when n is odd number, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (n+1)/2 (5:5) fiber optic splitter
It is connected, passes through (n+1)/2 (5:5) fiber optic splitter sends signal to first wave length selecting switch WSS1It is selected with third wavelength
Select switch WSS3。
N-1 to the 2nd (N-2) (1:N) fiber optic splitter is located at east-west direction, (N+n-2) (1:N) fiber optic splitter
Input terminal and the n-th west interface WnIt is connected, splitting ratio is the output port and the n-th+2 east interface E of Nn+2It is connected, wherein n is even
When number, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14It is connected, n is strange
When number, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (N+n-1)/2 (5:5) fiber optic splitter is connected, and leads to
Cross (N+n-1)/2 (5:5) fiber optic splitter sends signal to second wave length selecting switch WSS2It is opened with third wavelength selection
Close WSS3。
Wavelength division multiplexer MUX and (N+1) (5:5) fiber optic splitter is connected with outside ToR interchangers.It is handed in light of the present invention
The receiving terminal changed planes, wavelength division multiplexer MUX are received the optical signal of different wave length from external ToR by M optical fiber interface, passed through
Wavelength division multiplexer is multiplexed into an optical fiber, is sent to (N+1) (5:5) fiber optic splitter.
As 1≤s≤N/2-1, s (5:5) fiber optic splitter and first wave length selecting switch, third wavelength-selective switches
With (2s+1) (1:N) fiber optic splitter is connected.S (5:5) fiber optic splitter is from (2s+1) (1:N) fiber optic splitter receives
The optical signal for being 1 to splitting ratio, is then divided into 2 parts, is sent respectively to first wave length selecting switch and third wavelength selection
Switch, for judging that signal is to receive or forward.When s is N/2, s (5:5) fiber optic splitter is opened with first wave length selection
It closes, third wavelength-selective switches and the north N-1 interface are connected, s (5:5) fiber optic splitter connects from the north N-1 interface
The collection of letters number, is then divided into 2 parts, first wave length selecting switch and third wavelength-selective switches is sent respectively to, for judging
Signal is to receive or forward.As N/2+1≤s≤N-1, s (5:5) fiber optic splitter and second wave length selecting switch, the
Three wavelength-selective switches and (2s-1) (1:N) fiber optic splitter is connected, s (5:5) fiber optic splitter is from (2s-1) (1:N)
Fiber optic splitter receive splitting ratio be 1 signal, be then divided into 2 parts, be sent respectively to second wave length selecting switch and
Third wavelength-selective switches, for judging that signal is to receive or forward.When s is N, s (5:5) fiber optic splitter and second
Wavelength-selective switches, third wavelength-selective switches and the east N-1 interface are connected, s (5:5) fiber optic splitter is from N-1
East interface signal, is then divided into 2 parts, is sent respectively to second wave length selecting switch and third wavelength selection is opened
It closes, for judging that signal is to receive or forward.(N+1) (5:5) fiber optic splitter wavelength division multiplexer MUX, the first er-doped light
Fiber amplifier EDFA1, the second erbium-doped optical fiber amplifier EDFA2It is connected.(N+1) (5:5) fiber optic splitter by an optical fiber from
Wavelength division multiplexer MUX receives optical signal, by (N+1) (5:5) optical signal is divided into two parts by fiber optic splitter, is sent out respectively
Give the first erbium-doped optical fiber amplifier EDFA1, the second erbium-doped optical fiber amplifier EDFA2。
First erbium-doped optical fiber amplifier EDFA1With (N+1) (5:5) fiber optic splitter is connected, the first Erbium-doped fiber amplifier
Device EDFA1From (N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to North and South direction and is connect
Mouthful.Second erbium-doped optical fiber amplifier EDFA 2 and (N+1) (5:5) fiber optic splitter is connected, the second erbium-doped fiber amplifier
EDFA2From (N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to east-west direction interface.
Third erbium-doped optical fiber amplifier EDFA3With first wave length selecting switch WSS1It is connected, third erbium-doped optical fiber amplifier EDFA3From
One wavelength-selective switches WSS1It receives optical signal and optical signal amplification is subsequently sent to North and South direction interface.4th Er-doped fiber
Amplifier EDFA4With second wave length selecting switch WSS2It is connected, the 4th erbium-doped optical fiber amplifier EDFA4It is opened from second wave length selection
Close WSS2It receives optical signal and optical signal amplification is subsequently sent to east-west direction interface.
In the receiving terminal of optical switch, 4 N*1 wavelength-selective switches receive the difference that external different optical switch are sent
The optical signal of wavelength is connected by controlling the disconnection of different wave length optical signal and by establishing with other ToR interchangers.
First wave length selecting switch and second wave length selecting switch forward the signal of selection by erbium-doped fiber amplifier
To other directions.
First wave length selecting switch WSS1With the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ...,
N/2(5:5) fiber optic splitter and the 4th erbium-doped optical fiber amplifier EDFA4It is connected, w1For integer, 1≤w1≤N/2.First wave
Long selecting switch WSS1From the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ..., N/2 (5:5) optical fiber point
Beam device receives optical signal, decides whether optical signal passing through the 4th erbium-doped optical fiber amplifier EDFA4It is forwarded to east-west direction.
Second wave length selecting switch WSS2With (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber beam splitting
Device ..., N (5:5) fiber optic splitter and third erbium-doped optical fiber amplifier EDFA3It is connected, w2For integer, N/2+1≤w2≤
N.Second wave length selecting switch WSS2From (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber optic splitter ..., N
(5:5) fiber optic splitter receives optical signal, decides whether optical signal passing through third erbium-doped optical fiber amplifier EDFA3It is forwarded to south
The north to.
Third wavelength-selective switches WSS3With the 1st (5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N
(5:5) fiber optic splitter and fiber coupler Coupler are connected, w3For integer, 1≤w3≤N.Third wavelength-selective switches from
1st (5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N (5:5) fiber optic splitter receives same dimension
The signal that other upper optical switch forward decides whether to establish connection with the interchanger of other dimensions, then by selection
Optical signal is sent to fiber coupler Coupler.
4th wavelength-selective switches WSS4With the 2nd (1:N) fiber optic splitter ..., w4(1:N) fiber optic splitter ..., the 2nd
(N-2)(1:N the output port and fiber coupler Coupler that) splitting ratio of fiber optic splitter is 1 are connected, w4For integer,
2≤w4≤ 2 (N-2), and w4For even number.4th wavelength-selective switches are used for controlling the connection with the optical switch on different dimensions,
4th wavelength-selective switches are from the 2nd (1:N) fiber optic splitter ..., w4(1:N) fiber optic splitter ..., the 2nd (N-2) (1:N)
The output port that the splitting ratio of fiber optic splitter is 1 receives optical signal, decides whether to establish connection with the interchanger of other dimensions,
Then the optical signal of selection is sent to fiber coupler Coupler.
Fiber coupler Coupler and third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4, solution wavelength-division it is multiple
It is connected with device DEMUX.Fiber coupler Coupler is from third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4It receives
Optical signal is coupled to an optical fiber, optical signal is then sent to solution wavelength division multiplexer by optical signal.
Solution wavelength division multiplexer DEMUX is connected with fiber coupler Coupler, and is connected to outside by M optical fiber interface
ToR interchangers are connected.As shown in Fig. 2 (a), solution wavelength division multiplexer DEMUX receives optical signal from fiber coupler Coupler, will
Different wavelength signals are sent to external ToR interchangers by M optical fiber interface.
Control port and first wave length selecting switch WSS1, second wave length selecting switch WSS2, third wavelength-selective switches
WSS3, the 4th wavelength-selective switches WSS4And outside SDN controllers, that is, software defined network controller (Software
Defined Network) it is connected.Optical switch is configured by SDN controllers.
As shown in Fig. 2 (b), in actual deployment, using four corners of the world four direction port according to 2D- between optical switch
The mode of Mesh connects, and is connected using the optical fiber comprising different wave length between optical switch and ToR, the control port of optical switch
It is connected with SDN controllers, optical switch is configured by SDN controllers.
The interference networks course of work based on the optical switch is as shown in Figure 3：
Step (1):SDN controllers obtain bandwidth demand matrix by application layer or network layer
Step (2)：SDN controllers judge whether current network topology matches with bandwidth demand matrix, if matching
Network topology is had no need to change, and continues sensing network bandwidth demand；
Step (3):If mismatched, the wavelength of optical switch is adjusted according to bandwidth demand matrix, dynamic if SDN controllers
Network topology is set to meet bandwidth demand；
Step (4):After the completion of optical switch Wavelength Assignment, SDN controllers change the forward rule of ToR, with new network
Topology is adapted；
Step (5):After the completion of topology and rules modification, server carries out data transmission.
The Wavelength Assignment flow of the optical switch run on SDN controllers is as shown in Figure 4:
The first step inputs bandwidth requirement matrix
Second step, by bandwidth demand matrixTwo multigraph G' are converted into, assignment of wavelength is converted into two
The multiple map colouring problem in portion；
Third walk, the side (u, v) by source node and destination node not on same dimension split into two sides (u, w) and
(w, v), wherein w are forward node, and side (u, w) belongs to G '1, side (w, v) belongs to G'2, remaining side belongs to G '1, to obtain two
A two multigraph G '1And G'2；
4th step, in G '1And G'2The maximum matching m of middle searching, then in { G '1- m } and { G'2- m } in continually look for maximum
Matching, and so on, until G '1And G'2For sky；
5th step distributes different colors to each matching, that is, distributes different wavelength, and Wavelength Assignment is completed.
Compared with prior art, following technique effect can reach using the present invention：
1. framework of the optical switch of the present invention based on wavelength-selective switches and wavelength-division multiplex technique, by optical switch
Increase wavelength-selective switches component so that can establish an optical link between arbitrary ToR, be forwarded without being subjected to ToR.Cause
This, the network based on optical switch composition can support large-scale data center ToR to interconnect, and can be built between arbitrary ToR
Vertical point-to-point optical link reduces network transmission delay, while also improving the flexibility of optical switching network.
2. optical switch of the present invention is connected using four corners of the world four direction port in the way of 2D-Mesh, light exchanges
It is connected using the M optical fiber comprising different wave length between machine and ToR, the control port of optical switch is connected with SDN controllers, leads to
It crosses SDN controllers to configure optical switch, the bandwidth of link can be adjusted.
Description of the drawings
Fig. 1 is the structure chart of optical switch of the present invention.
Fig. 2 (a) is structure of the invention schematic diagram, and Fig. 2 (b) optical switch of the present invention is illustrated in the deployment of extensive interference networks
Figure.
Fig. 3 is the interference networks course of work flow chart based on optical switch of the present invention.
Fig. 4 is the Wavelength Assignment flow chart of the optical switch run on SDN controllers in the present invention.
Specific implementation mode
Below in conjunction with the accompanying drawings with example in detail embodiments of the present invention.
The present invention is a kind of for optical switch in data center network, using the optical switch can arbitrary ToR it
Between establish the optical link of point-to-point, the hardware configuration of optical switch is as shown in Figure 1.
As shown in Figure 1, the present invention supports that the optical switch of extensive full light network includes：(1) four identical to mix
Doped fiber amplifier (EDFA), (2) N+1 5:5 fiber optic splitters (5:5splitter), splitting ratio is 5 in both direction:5,
(3) wavelength division multiplexer (MUX), (4) solve wavelength division multiplexer (DEMUX), (5) fiber coupler (Coupler), (6) 2 N/2*1
Wavelength-selective switches (WSS), 2 N*1 wavelength-selective switches (WSS), (7) M bidirectional optical fiber interface (fiber), (8) 2 (N-2)
A identical 1:N fiber optic splitters (1:N splitter), the splitting ratio of the same direction and vertical direction is 1:N, wherein N
It is determined by wavelength-selective switches, (9) control port (Console).
The present invention supports that the optical switch of extensive full light network includes four corners of the world four direction interface, and each direction has
N number of optical fiber interface, for being interconnected between optical switch, N number of south interface is denoted as the 1st southern interface S respectively1..., the i-th south
Interface Si..., the south N interface SN, N number of north interface is denoted as the 1st northern interface N respectively1..., the i-th northern interface Ni、…、
The north N interface NN, N number of east interface is denoted as the 1st east interface E respectively1..., the i-th east interface Ei..., the east N interface
EN, N number of west interface is denoted as the 1st west interface W respectively1..., the i-th west interface Wi..., the wests N interface WN, i is integer,
1≤i≤N；Including M bidirectional optical fiber interface, is attached by optical fiber with ToR interchangers, is denoted as the 1st transceiver interface respectively
P1..., kth meets transceiver interface Pk..., M transceiver interfaces PM, k is integer, 1≤k≤M.
Four erbium-doped fiber amplifiers are denoted as the first erbium-doped optical fiber amplifier EDFA respectively1, the second erbium-doped fiber amplifier
EDFA2, third erbium-doped optical fiber amplifier EDFA3, the 4th erbium-doped optical fiber amplifier EDFA4。
2 N/2*1 wavelength-selective switches are denoted as first wave length selecting switch WSS respectively1, second wave length selecting switch WSS2,
2 N*1 wavelength-selective switches are denoted as third wavelength-selective switches WSS respectively3, the 4th wavelength-selective switches WSS4。
N+1 (5:5) fiber optic splitter is denoted as the 1st (5 respectively:5) fiber optic splitter ..., s (5:5) fiber optic splitter
I.e. (5:5)splitters..., N (5:5) fiber optic splitter, (N+1) (5:5) fiber optic splitter, 1≤s≤N, s are whole
Number, s (5:5) fiber optic splitter formalization representation is (5:5)Splitters。
2 (N-2) a 1:N fiber optic splitters are denoted as the 1st (1 respectively:N) fiber optic splitter ..., t (1:N) fiber beam splitting
Device ..., the 2nd (N-2) (1:N) fiber optic splitter, t are integer, 1≤t≤2 (N-2), t (1:N) fiber optic splitter formalizes table
It is shown as (1:N)Splittert。
1st to (N-2) (1:N) fiber optic splitter is located at North and South direction, and n-th (1:N) input terminal of fiber optic splitter with
N-th northern interface NnIt is connected, the southern interface S of the output port and n-th+2 that splitting ratio is Nn+2It is connected, 1≤n≤N-2, n are whole
Number, when n is even number, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14Phase
Even, when n is odd number, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (n+1)/2 (5:5) fiber optic splitter
It is connected, passes through (n+1)/2 (5:5) fiber optic splitter sends signal to first wave length selecting switch WSS1It is selected with third wavelength
Select switch WSS3。
N-1 to the 2nd (N-2) (1:N) fiber optic splitter is located at east-west direction, (N+n-2) (1:N) fiber optic splitter
Input terminal and the n-th west interface WnIt is connected, splitting ratio is the output port and the n-th+2 east interface E of Nn+2It is connected, wherein n is even
When number, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14It is connected, n is strange
When number, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (N+n-1)/2 (5:5) fiber optic splitter is connected, and leads to
Cross (N+n-1)/2 (5:5) fiber optic splitter sends signal to second wave length selecting switch WSS2It is opened with third wavelength selection
Close WSS3。
Wavelength division multiplexer MUX and (N+1) (5:5) fiber optic splitter is connected with outside ToR interchangers.It is handed in light of the present invention
The receiving terminal changed planes, wavelength division multiplexer MUX are received the optical signal of different wave length from external ToR by M optical fiber interface, passed through
Wavelength division multiplexer is multiplexed into an optical fiber, is sent to (N+1) (5:5) fiber optic splitter.
As 1≤s≤N/2-1, s (5:5) fiber optic splitter and first wave length selecting switch, third wavelength-selective switches
With (2s+1) (1:N) fiber optic splitter is connected.S (5:5) fiber optic splitter is from (2s+1) (1:N) fiber optic splitter receives
The optical signal for being 1 to splitting ratio, is then divided into 2 parts, is sent respectively to first wave length selecting switch and third wavelength selection
Switch, for judging that signal is to receive or forward.When s is N/2, s (5:5) fiber optic splitter is opened with first wave length selection
It closes, third wavelength-selective switches and the north N-1 interface are connected, s (5:5) fiber optic splitter connects from the north N-1 interface
The collection of letters number, is then divided into 2 parts, first wave length selecting switch and third wavelength-selective switches is sent respectively to, for judging
Signal is to receive or forward.As N/2+1≤s≤N-1, s (5:5) fiber optic splitter and second wave length selecting switch, the
Three wavelength-selective switches and (2s-1) (1:N) fiber optic splitter is connected, s (5:5) fiber optic splitter is from (2s-1) (1:N)
Fiber optic splitter receive splitting ratio be 1 signal, be then divided into 2 parts, be sent respectively to second wave length selecting switch and
Third wavelength-selective switches, for judging that signal is to receive or forward.When s is N, s (5:5) fiber optic splitter and second
Wavelength-selective switches, third wavelength-selective switches and the east N-1 interface are connected, s (5:5) fiber optic splitter is from N-1
East interface signal, is then divided into 2 parts, is sent respectively to second wave length selecting switch and third wavelength selection is opened
It closes, for judging that signal is to receive or forward.(N+1) (5:5) fiber optic splitter wavelength division multiplexer MUX, the first er-doped light
Fiber amplifier EDFA1, the second erbium-doped optical fiber amplifier EDFA2It is connected.(N+1) (5:5) fiber optic splitter by an optical fiber from
Wavelength division multiplexer MUX receives optical signal, by (N+1) (5:5) optical signal is divided into two parts by fiber optic splitter, is sent out respectively
Give the first erbium-doped optical fiber amplifier EDFA1, the second erbium-doped optical fiber amplifier EDFA2。
First erbium-doped optical fiber amplifier EDFA1With (N+1) (5:5) fiber optic splitter is connected, the first Erbium-doped fiber amplifier
Device EDFA1From (N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to North and South direction and is connect
Mouthful.Second erbium-doped optical fiber amplifier EDFA 2 and (N+1) (5:5) fiber optic splitter is connected, the second erbium-doped fiber amplifier
EDFA2From (N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to east-west direction interface.
Third erbium-doped optical fiber amplifier EDFA3With first wave length selecting switch WSS1It is connected, third erbium-doped optical fiber amplifier EDFA3From
One wavelength-selective switches WSS1It receives optical signal and optical signal amplification is subsequently sent to North and South direction interface.4th Er-doped fiber
Amplifier EDFA4With second wave length selecting switch WSS2It is connected, the 4th erbium-doped optical fiber amplifier EDFA4It is opened from second wave length selection
Close WSS2It receives optical signal and optical signal amplification is subsequently sent to east-west direction interface.
In the receiving terminal of optical switch, 4 N*1 wavelength-selective switches receive the difference that external different optical switch are sent
The optical signal of wavelength is connected by controlling the disconnection of different wave length optical signal and by establishing with other ToR interchangers.
First wave length selecting switch and second wave length selecting switch forward the signal of selection by erbium-doped fiber amplifier
To other directions.
First wave length selecting switch WSS1With the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ...,
N/2(5:5) fiber optic splitter and the 4th erbium-doped optical fiber amplifier EDFA4It is connected, w1For integer, 1≤w1≤N/2.First wave
Long selecting switch WSS1From the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ..., N/2 (5:5) optical fiber point
Beam device receives optical signal, decides whether optical signal passing through the 4th erbium-doped optical fiber amplifier EDFA4It is forwarded to east-west direction.
Second wave length selecting switch WSS2With (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber beam splitting
Device ..., N (5:5) fiber optic splitter and third erbium-doped optical fiber amplifier EDFA3It is connected, w2For integer, N/2+1≤w2≤
N.Second wave length selecting switch WSS2From (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber optic splitter ..., N
(5:5) fiber optic splitter receives optical signal, decides whether optical signal passing through third erbium-doped optical fiber amplifier EDFA3It is forwarded to south
The north to.
Third wavelength-selective switches WSS3With the 1st (5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N
(5:5) fiber optic splitter and fiber coupler Coupler are connected, w3For integer, 1≤w3≤N.Third wavelength-selective switches from
1st (5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N (5:5) fiber optic splitter receives same dimension
The signal that other upper optical switch forward decides whether to establish connection with the interchanger of other dimensions, then by selection
Optical signal is sent to fiber coupler Coupler.
4th wavelength-selective switches WSS4With the 2nd (1:N) fiber optic splitter ..., w4(1:N) fiber optic splitter ..., the 2nd
(N-2)(1:N the output port and fiber coupler Coupler that) splitting ratio of fiber optic splitter is 1 are connected, w4For integer,
2≤w4≤ 2 (N-2), and w4For even number.4th wavelength-selective switches are used for controlling the connection with the optical switch on different dimensions,
4th wavelength-selective switches are from the 2nd (1:N) fiber optic splitter ..., w4(1:N) fiber optic splitter ..., the 2nd (N-2) (1:N)
The output port that the splitting ratio of fiber optic splitter is 1 receives optical signal, decides whether to establish connection with the interchanger of other dimensions,
Then the optical signal of selection is sent to fiber coupler Coupler.
Fiber coupler Coupler and third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4, solution wavelength-division it is multiple
It is connected with device DEMUX.Fiber coupler Coupler is from third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4It receives
Optical signal is coupled to an optical fiber, optical signal is then sent to solution wavelength division multiplexer by optical signal.
Solution wavelength division multiplexer DEMUX is connected with fiber coupler Coupler, and is connected to outside by M optical fiber interface
ToR interchangers are connected.As shown in Fig. 2 (a), solution wavelength division multiplexer DEMUX receives optical signal from fiber coupler Coupler, will
Different wavelength signals are sent to external ToR interchangers by M optical fiber interface.
Control port and first wave length selecting switch WSS1, second wave length selecting switch WSS2, third wavelength-selective switches
WSS3, the 4th wavelength-selective switches WSS4And outside SDN controllers are connected.Optical switch is matched by SDN controllers
It sets.
As shown in Fig. 2 (b), in actual deployment, using four corners of the world four direction port according to 2D- between optical switch
The mode of Mesh connects, and is connected using the optical fiber comprising different wave length between optical switch and ToR, the control port of optical switch
It is connected with SDN controllers, optical switch is configured by SDN controllers.
The interference networks course of work based on the optical switch is as shown in Figure 3：
Step (1):SDN controllers obtain bandwidth demand matrix by application layer or network layer
Step (2)：SDN controllers judge whether current network topology matches with bandwidth demand matrix, if matching
Network topology is had no need to change, and continues sensing network bandwidth demand；
Step (3):If mismatched, the wavelength of optical switch is adjusted according to bandwidth demand matrix, dynamic if SDN controllers
Network topology is set to meet bandwidth demand；
Step (4):After the completion of optical switch Wavelength Assignment, SDN controllers change the forward rule of ToR, with new network
Topology is adapted；
Step (5):After the completion of topology and rules modification, server carries out data transmission.
The Wavelength Assignment flow of the optical switch run on SDN controllers is as shown in Figure 4:
The first step inputs bandwidth requirement matrix
Second step, by bandwidth demand matrixTwo multigraph G' are converted into, assignment of wavelength is converted into two
The multiple map colouring problem in portion；
Third walk, the side (u, v) by source node and destination node not on same dimension split into two sides (u, w) and
(w, v), wherein w are forward node, and side (u, w) belongs to G '1, side (w, v) belongs to G'2, remaining side belongs to G '1, to obtain two
A two multigraph G '1And G'2；
4th step, in G '1And G'2The maximum matching m of middle searching, then in { G '1- m } and { G '2- m } in continually look for maximum
Matching, and so on, until G '1And G'2For sky；
5th step distributes different colors to each matching, that is, distributes different wavelength, and Wavelength Assignment is completed.
The above is only a preferred embodiment of the present invention, protection scope of the present invention is not limited merely to above-mentioned implementation
Example, all technical solutions belonged under thinking of the present invention all belong to the scope of protection of the present invention.It should be pointed out that for the art
Those of ordinary skill for, several improvements and modifications without departing from the principles of the present invention, these improvements and modifications
It should be regarded as protection scope of the present invention.
Claims (1)
1. a kind of optical switch for supporting extensive, full light network, which is characterized in that including four identical Er-doped fibers
Amplifier EDFA, N+1 a 5:5 fiber optic splitters i.e. 5:5splitter, wavelength division multiplexer MUX solve wavelength division multiplexer DEMUX, light
Fine coupler Coupler, 2 N/2*1 wavelength-selective switches WSS, 2 N*1 wavelength-selective switches WSS, M bidirectional optical fiber interface
Fiber, 2 (N-2) a identical 1:N fiber optic splitters i.e. 1:N splitter, wherein N are integer, and N is opened by wavelength selection
Close decision and control port Console；Further include four corners of the world four direction interface, there is N number of optical fiber interface in each direction,
For being interconnected between optical switch, N number of south interface is denoted as the 1st southern interface S respectively1..., the i-th southern interface Si..., N
Southern interface SN, N number of north interface is denoted as the 1st northern interface N respectively1..., the i-th northern interface Ni..., the north N interface NN,
N number of east interface is denoted as the 1st east interface E respectively1..., the i-th east interface Ei..., the east N interface EN, N number of west interface
It is denoted as the 1st west interface W respectively1..., the i-th west interface Wi..., the wests N interface WN, i is integer, 1≤i≤N；Including M
A bidirectional optical fiber interface is attached by optical fiber with cabinet top interchanger, that is, ToR interchangers, is denoted as the 1st transceiver interface respectively
P1..., kth meets transceiver interface Pk..., M transceiver interfaces PM, k is integer, 1≤k≤M；
Four erbium-doped fiber amplifiers are denoted as the first erbium-doped optical fiber amplifier EDFA respectively1, the second erbium-doped optical fiber amplifier EDFA2、
Third erbium-doped optical fiber amplifier EDFA3, the 4th erbium-doped optical fiber amplifier EDFA4；2 N/2*1 wavelength-selective switches are denoted as respectively
One wavelength-selective switches WSS1, second wave length selecting switch WSS2, 2 N*1 wavelength-selective switches are denoted as third wavelength selection respectively
Switch WSS3, the 4th wavelength-selective switches WSS4；N+1 (5:5) fiber optic splitter is denoted as the 1st (5 respectively:5) fiber beam splitting
Device ..., s (5:5) fiber optic splitter ..., N (5:5) fiber optic splitter, (N+1) (5:5) fiber optic splitter, 1≤s≤
N, s are integer, s (5:5) fiber optic splitter formalization representation is (5:5)Splitters；2 (N-2) a 1:N fiber optic splitters
It is denoted as the 1st (1 respectively:N) fiber optic splitter ..., t (1:N) fiber optic splitter ..., the 2nd (N-2) (1:N) fiber optic splitter, t
For integer, 1≤t≤2 (N-2), t (1:N) fiber optic splitter formalization representation is (1:N)Splittert；
1st to (N-2) (1:N) fiber optic splitter is located at North and South direction, and n-th (1:N) input terminal of fiber optic splitter and the n-th north
Square interface NnIt is connected, the southern interface S of the output port and n-th+2 that splitting ratio is Nn+2It is connected, 1≤n≤N-2, n are integer, and n is
When even number, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14It is connected, n is
When odd number, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (n+1)/2 (5:5) fiber optic splitter is connected, and leads to
Cross (n+1)/2 (5:5) fiber optic splitter sends signal to first wave length selecting switch WSS1With third wavelength-selective switches
WSS3；
N-1 to the 2nd (N-2) (1:N) fiber optic splitter is located at east-west direction, (N+n-2) (1:N) the input of fiber optic splitter
End and the n-th west interface WnIt is connected, splitting ratio is the output port and the n-th+2 east interface E of Nn+2It is connected, wherein n is even number
When, n-th (1:N) the output port and the 4th wavelength-selective switches WSS that the splitting ratio of fiber optic splitter is 14It is connected, n is odd number
When, n-th (1:N) splitting ratio of fiber optic splitter is 1 output port and (N+n-1)/2 (5:5) fiber optic splitter is connected, and passes through
(N+n-1)/2 (5:5) fiber optic splitter sends signal to second wave length selecting switch WSS2With third wavelength-selective switches
WSS3；
Wavelength division multiplexer MUX and (N+1) (5:5) fiber optic splitter is connected with outside ToR interchangers；Wavelength division multiplexer MUX is logical
The optical signal that M optical fiber interface receives different wave length from external ToR is crossed, an optical fiber is multiplexed by wavelength division multiplexer, is sent out
Give (N+1) (5:5) fiber optic splitter；
As 1≤s≤N/2-1, s (5:5) fiber optic splitter and first wave length selecting switch, third wavelength-selective switches and the
(2s+1)(1:N) fiber optic splitter is connected；S (5:5) fiber optic splitter is from (2s+1) (1:N) fiber optic splitter receives point
Then light is divided into 2 parts than the optical signal for 1, be sent respectively to first wave length selecting switch and third wavelength-selective switches,
For judging that signal is to receive or forward；When s is N/2, s (5:5) fiber optic splitter and first wave length selecting switch, the
Three wavelength-selective switches and the north N-1 interface are connected, s (5:5) fiber optic splitter is believed from the north N-1 interface
Number, 2 parts are then divided into, first wave length selecting switch and third wavelength-selective switches are sent respectively to, for judging signal
It is to receive or forward；As N/2+1≤s≤N-1, s (5:5) fiber optic splitter and second wave length selecting switch, third wave
Long selecting switch and (2s-1) (1:N) fiber optic splitter is connected, s (5:5) fiber optic splitter is from (2s-1) (1:N) optical fiber
Beam splitter receives the signal that splitting ratio is 1, is then divided into 2 parts, is sent respectively to second wave length selecting switch and third
Wavelength-selective switches, for judging that signal is to receive or forward；When s is N, s (5:5) fiber optic splitter and second wave length
Selecting switch, third wavelength-selective switches and the east N-1 interface are connected, s (5:5) fiber optic splitter is from the east N-1
Then interface signal is divided into 2 parts, be sent respectively to second wave length selecting switch and third wavelength-selective switches, uses
In judge signal be receive or forwarding；(N+1) (5:5) fiber optic splitter wavelength division multiplexer MUX, the first Erbium-doped fiber amplifier
Device EDFA1, the second erbium-doped optical fiber amplifier EDFA2It is connected；(N+1) (5:5) fiber optic splitter is multiple from wavelength-division by an optical fiber
Optical signal is received with device MUX, by (N+1) (5:5) optical signal is divided into two parts by fiber optic splitter, is sent respectively to
One erbium-doped optical fiber amplifier EDFA1, the second erbium-doped optical fiber amplifier EDFA2；
First erbium-doped optical fiber amplifier EDFA1With (N+1) (5:5) fiber optic splitter is connected, the first erbium-doped fiber amplifier
EDFA1From (N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to North and South direction interface；
Second erbium-doped optical fiber amplifier EDFA 2 and (N+1) (5:5) fiber optic splitter is connected, the second erbium-doped optical fiber amplifier EDFA2From
(N+1) (5:5) fiber optic splitter receives optical signal and optical signal amplification is subsequently sent to east-west direction interface；Third er-doped
Fiber amplifier EDFA3With first wave length selecting switch WSS1It is connected, third erbium-doped optical fiber amplifier EDFA3It is selected from first wave length
Select switch WSS1It receives optical signal and optical signal amplification is subsequently sent to North and South direction interface；4th erbium-doped fiber amplifier
EDFA4With second wave length selecting switch WSS2It is connected, the 4th erbium-doped optical fiber amplifier EDFA4From second wave length selecting switch WSS2
It receives optical signal and optical signal amplification is subsequently sent to east-west direction interface；
First wave length selecting switch WSS1With the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ..., N/2
(5:5) fiber optic splitter and the 4th erbium-doped optical fiber amplifier EDFA4It is connected, w1For integer, 1≤w1≤N/2；First wave length is selected
Select switch WSS1From the 1st (5:5) fiber optic splitter ..., w1(5:5) fiber optic splitter ..., N/2 (5:5) fiber optic splitter
Optical signal is received, decides whether optical signal passing through the 4th erbium-doped optical fiber amplifier EDFA4It is forwarded to east-west direction；
Second wave length selecting switch WSS2With (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber optic splitter ...,
N (5:5) fiber optic splitter and third erbium-doped optical fiber amplifier EDFA3It is connected, w2For integer, N/2+1≤w2≤N；Second
Wavelength-selective switches WSS2From (N/2+1) (5:5) fiber optic splitter ..., w2(5:5) fiber optic splitter ..., N (5:5)
Fiber optic splitter receives optical signal, decides whether optical signal passing through third erbium-doped optical fiber amplifier EDFA3It is forwarded to the South and the North
To；
Third wavelength-selective switches WSS3With the 1st (5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N (5:
5) fiber optic splitter and fiber coupler Coupler are connected, w3For integer, 1≤w3≤N；Third wavelength-selective switches are from the 1st
(5:5) fiber optic splitter ..., w3(5:5) fiber optic splitter ..., N (5:5) fiber optic splitter receives on same dimension
The signal that other optical switch forward decides whether to establish connection with the interchanger of other dimensions, then by the light of selection
Signal is sent to fiber coupler Coupler；
4th wavelength-selective switches WSS4With the 2nd (1:N) fiber optic splitter ..., w4(1:N) fiber optic splitter ..., the 2nd (N-
2)(1:N the output port and fiber coupler Coupler that) splitting ratio of fiber optic splitter is 1 are connected, w4For integer, 2≤
w4≤ 2 (N-2), and w4For even number；4th wavelength-selective switches are from the 2nd (1:N) fiber optic splitter ..., w4(1:N) optical fiber point
Beam device ..., the 2nd (N-2) (1:N) splitting ratio of fiber optic splitter be 1 output port receive optical signal, decide whether with it is other
The interchanger of dimension establishes connection, and the optical signal of selection is then sent to fiber coupler Coupler；
Fiber coupler Coupler and third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4, solution wavelength division multiplexer
DEMUX is connected；Fiber coupler Coupler is from third wavelength-selective switches WSS3, the 4th wavelength-selective switches WSS4Receive light letter
Number, optical signal is coupled to an optical fiber, optical signal is then sent to solution wavelength division multiplexer；
Solution wavelength division multiplexer DEMUX is connected with fiber coupler Coupler, and is connected to external ToR by M optical fiber interface and hands over
It changes planes connected；It solves wavelength division multiplexer DEMUX and receives optical signal from fiber coupler Coupler, different wavelength signals are passed through into M
A optical fiber interface is sent to external ToR interchangers；
Control port and first wave length selecting switch WSS1, second wave length selecting switch WSS2, third wavelength-selective switches WSS3、
4th wavelength-selective switches WSS4And outside SDN controllers, that is, software defined network controller is connected；Pass through SDN controllers pair
Optical switch is configured.
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| CN112260788B (en) * | 2020-10-19 | 2021-09-03 | 北京邮电大学 | Dynamic high-precision time-frequency synchronous network |
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