JP3276293B2 - Light distribution device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an optical distribution device used for an optical communication terminal or the like, and more particularly, to an optical distribution device having an improved redundancy method in an optical video distribution device.

[0002]

2. Description of the Related Art SCM (Sub-Carrier Multiplexing), which frequency-multiplexes and transmits an RF carrier signal to an optical fiber having excellent characteristics of a wide band, low loss, and no induction, is being put to practical use. In addition, in the case of an all-optical distribution system in which a video signal is distributed as light in a subscriber system, a high output is required on the light transmitting side due to distribution loss. In order to satisfy this requirement, an optical amplification / distribution technique that enables an optical signal to be amplified as it is has been researched and developed.

[0003] Conventionally, as this type of apparatus, for example, "Na
National Technical Report Vol.39 No.4 Aug.1993 ".

FIG. 9 is a diagram showing the overall configuration of a frequency division multiplexing optical subscriber transmission system disclosed in the above document, and FIG.
It is a figure showing the detailed composition of C.

[0005] In FIG. 9, the optical subscriber transmission system comprises:
FDM that FM-modulates and frequency-multiplexes 50ch video signal
-TX (E / E / MUX11) which directly modulates the intensity of the laser diode and outputs it to the optical fiber after amplification by the optical amplifier
O) After 12 and 8 branches, AMP / BRC units 13 to 15 (AM
P / BRC units 1 to 3), an optical subscriber line 16 composed of an optical fiber, and a 16-branch unit 17 connected to the optical subscriber line 16 and further dividing the video signal into 16 and distributing it to the optical subscriber's home. You. In addition, at the subscriber's house, an ONU (Optical Network Un-
it) 18, CSU (Ch) for demodulating video and audio signals after tuning
annel Select Unit) 19 and a TV 20.

The above three-stage AMP / BRC units 13 to
15 constitutes the AMP / BRC module 21 as a whole.

The AMP / BRC units 13 to 15
After 8 branches, the optical amplifier compensates for the branch loss. Of the eight branches, one output has a redundant configuration used as a standby system.

FIG. 10 shows the AMP / BRC unit 13
15 is a block diagram of the AMP / BR.
Each of the C units 13 to 15 includes a 1 × 8 coupler 22 for branching input light, an optical amplifier (AMP) 23 for performing optical amplification, a 1 × 8 optical switch 24 for changing a light path, and a 1 × 2 optical switch 25. You.

Here, the TX (E / O) 12 has a double structure including a standby system in order to enhance reliability.
The same system 0 system and 1 system are provided. Usually, one system is used, and when an abnormality occurs, the system is switched to the other system for use.

In FIG. 10, TX (E / O) 1
The light input from 2 is converted into 8 light by a 1 × 8 optical coupler 24.
A 1 × 8 optical switch 24 is connected so that one output of the optical amplifier 23 is switched when another output becomes abnormal. Is attached to the other end of the 2 × 1 optical switch 25 attached to the output of another optical amplifier. The output terminal of the 2 × 1 optical switch 25 selects and outputs the output of the 1 × 8 optical switch 24 or the output of another optical amplifier.

The AMP / BRC units 13 to 15
Performs optical amplification by splitting the input light from the TX (E / O) 12 into eight. Also in this case, one of the eight branches is for standby and has a redundant configuration.

However, in such a conventional optical distribution device, the same system and functions that are not required in a normal state must be additionally provided for a redundant configuration, and the control thereof becomes complicated. In some cases, the ratio of the redundant configuration of the hardware and software of the device has increased.

The present applicant has already filed an application for an optical distribution device and an optical distribution redundant method that can reduce the number of hardware components having only a redundant configuration and simplify the control (Japanese Patent Application No. Hei 8-108).
No. 179039).

FIG. 11 shows an example of the configuration of a redundant system of an optical distribution device according to the above-mentioned prior application. In FIG. 11, reference numeral 30 denotes an optical transmitter (TX0) for transmitting an optical signal, and 31 denotes an optical transmitter (T
X1), EO is an electro-optical converter for converting an electric signal to an optical signal, AMP is an optical amplifier having an auto power control function for amplifying an optical signal, S is a 2 × 2 optical switch having the function of an optical coupler, C is a 1 × N optical coupler for distribution,
And RX are optical receivers for receiving optical signals.

With such a configuration, the failure such as the failure of the optical amplifier or the disconnection of the optical fiber is compensated by the other pair of the optical amplifiers.

[0016]

As described above, it is possible to prevent the redundant system from having the same system or function that is not required in a normal state and to construct the redundant system with a small amount of hardware and software. However, this is a configuration for the effects achieved only by the above-described components, and does not particularly mention the connection configuration of the entire system.

An object of the present invention is to construct a redundant configuration which is flexible with respect to a failure in an upper node, in particular, by limiting connection routes of the entire configuration.

[0018]

According to the present invention, there is provided an optical distribution device comprising: a first-stage first optical amplifier having one input and 2n outputs (n is a positive integer);
Plastic and 1st stage 2nd optical coupler, 1st stage with 2 inputs and 2 outputs
1st optical switch to 1st stage 2n optical switch, 1 input
2n output first stage optical coupler to 2nd stage 4n optical coupler
And the second-stage first optical switch through the second stage having two inputs and two outputs
4m (m is a positive integer) optical switch, and
1st optical switch to 1st stage 2n optical switch and 2nd stage
The 1st optical switch to the 2nd stage 4m optical switch are
When one is abnormal, the other input is equally distributed and output.
Light input to the first stage optical coupler or the first stage second optical coupler
The signal is transmitted from the first stage first optical switch to the first stage second optical switch.
2nd stage 1st optical coupler to 2nd stage 4n light via switch
Split by a coupler, from the second stage first optical switch to the second stage first optical switch
In the optical distribution device output from the 2m optical switch, <A1> first stage first optical coupler and first stage first optical
Switch to the first-stage n-th optical switch,
Configuration and then, <A2> first stage second optical coupler, and the first stage the (n
+1) The first to second-stage optical switches from the first stage to the first stage
The structure of the second group, which is different from the group,
And, <B1> the second stage first optical coupler to the second-stage second 2n optical coupler
And second stage first optical switch to second stage second optical switch
The switches are configured as a first group, and <B2> second stage (2n + 1) optical coupler to second stage
4n optical coupler and second stage (2m + 1) optical switch
H to the second-stage 4m optical switch in the second group configuration
And then, <C1> first stage first optical coupler is a first group of structure
A first output terminal to an n-th output terminal of the first group
In a first optical switch to the first-stage first stage the n Hikarisu switch
And <C2> a first-stage first optical cap, which is a configuration of a first group.
The (n + 1) th output terminal to the (2n) th output terminal of the
First to (n + 1) th optical switches to
<C3> a first-stage second optical switch which is connected to a first input terminal of a first-stage second optical switch,
A first output terminal to an n-th output terminal of the first group
1st stage first optical switch to 1st stage nth optical switch
And <C4> a first-stage second optical cap having a second group configuration.
The (n + 1) th output terminal to the (2n) th output terminal of the
First to (n + 1) th optical switches to
<D1> a first-stage first optical switch which is connected to the second input terminal of the first-stage second-n optical switch,
Switch to the first output terminal and the second output terminal of the first-stage n-th optical switch.
The first end is a second-stage first optical coupler having a first group configuration.
<D2> are connected to the input terminals of the second-stage and second-n optical couplers, respectively. <D2> The first-stage (n +
1) The first output of the optical switch to the first-stage 2n-th optical switch
Terminal and the second output terminal are connected to a second stage of a second group configuration.
Input of (2n + 1) -th optical coupler through second-stage fourth-n optical coupler
Respectively connected to the force terminal, <E1> second stage first optical coupler is a first group of structure
To the first to n-th outputs of the second to second n-th optical couplers
The second end of the first optical switch having a first group configuration
To the first input terminal of the second-stage second-m optical switch.
Continued to, <E2> second stage first optical coupler is a first group of structure
To the (n + 1) -th output terminal of the second to second n-th optical couplers
The 2n-th output terminal is connected to the second stage of the second group configuration.
(2m + 1) optical switch to second stage 4m optical switch
<E3> are connected to the first input terminals, respectively. <E3> The second stage (2n +
1) The first output terminal of the optical coupler or the second stage 4n optical coupler
The n-th output terminal is connected to the second stage first stage which is a second group configuration.
Optical switch to the second input terminal of the second stage 2m optical switch
Each connected, <E4> second stage is the configuration of the second group the (2n +
1) (n + 1) th of the optical coupler to the second stage and the 4nth optical coupler
An output terminal to the 2n output terminals, is the second group configuration
2nd stage (2m + 1) optical switch to 2nd stage 4m optical switch
Connected to the second input terminals of the switch respectively.
ing.

Further, the optical distribution device according to the present invention is characterized in that: <F1> an optical power of the third group and the first group of 1 input 2n output.
A plurality of plug, the third stage a second group of <F2> 1 input 2n output light mosquito
A plurality of plug, the <G1> 2 input 2 third stage the first group of output light Sui
A plurality of pitch, <G2> 2-input 2 third stage a second group of output light Sui
A plurality of pitch, <G3> optical switch and third stage of the third stage first group
The second group of optical switches is used when one of the inputs is abnormal.
By equally distributing the other input to output, <H> the second stage the first optical switch to the second stage first 2m light Sui
The first output terminal and the second output terminal of the switch are connected to a third stage first glue.
Of the optical coupler of the third stage and the optical coupler of the second group of the third stage
Connected to the end, <I1> output end of the optical coupler of the third stage the first group is the
Three-stage first group optical switch and third-stage second group
Is connected to the one input terminal of the optical switch, <I2> output end of the optical coupler of the third-stage second group third
Three-stage first group optical switch and third-stage second group
To be connected to the other input of the optical switch
May be used.

Further, the light distribution device according to the present invention has one input.
1st stage first optical coupler to 3n output (n is a positive integer)
One-stage third optical coupler and three-input three-output first-stage first optical switch
Switch to first stage 3n optical switch, and 1 input and 3n output
2nd stage 1st optical coupler to 2nd stage 9n optical coupler
3rd output first optical switch to 3rd output 9m (m
Is a positive integer) optical switch, and the first stage first optical switch
To the first-stage third optical switch and the second-stage first optical switch.
The second to ninth-stage 9m optical switches have one or two inputs.
In the event of an abnormality, the other input is equally distributed and output.
Optical signals input to the first to third optical couplers
Are the first stage first optical switch to the first stage third optical switch.
Through the second stage first optical coupler to the second stage 9n optical coupler.
2nd stage first optical switch to 2nd stage ninth
In optical distributor output from m optical switches, <A1> first stage first optical coupler, and the first stage first light
Switch to the first-stage n-th optical switch,
Configuration and then, <A2> first stage second optical coupler, and the first stage the (n
+1) The first to second-stage optical switches from the first stage to the first stage
The structure of the second group, which is different from the group,
And, <A3> first stage third optical coupler, and the first stage the (2
(n + 1) optical switch through first-stage third-n optical switch
A third configuration different from the first and second groups
A group of structure, <B1> the second stage first optical coupler to the second-stage second 3n light coupler
And second stage first optical switch to second stage third optical switch
The switches are configured as a first group, and <B2> second stage (3n + 1) optical coupler to second stage
6n optical coupler and second stage (3m + 1) optical switch
H to the second stage 6m optical switch, the second group configuration
And then, <B3> second stage the (6n + 1) optical coupler to the second-stage second
9n optical coupler and second stage (6m + 1) optical switch
The second to ninth optical switches are arranged in a third group.
And then, <C1.1> first stage the first light is a first group of structure
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the first input terminal of the pitch, <C1.2> first stage the first light is a first group of structure
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the second
First-stage (n + 1) -th optical switch having a group configuration
Connected to the first input terminal of the 1st stage 2n optical switch
And, <C1.3> first stage the first light is a first group of structure
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having three groups
To the first input terminals of the first to third stage optical switches, respectively.
Connect, <C2.1> first stage second light is a structure of the second group
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the second input terminal of the pitch, <C2.2> first stage second light is a structure of the second group
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the second
First-stage (n + 1) -th optical switch having a group configuration
Connected to the second input terminal of the 1st stage 2n optical switch
And, <C2.3> first stage second light is a structure of the second group
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having two groups
To the second input terminals of the first to third n optical switches, respectively.
Connect, <C3.1> first stage third light is a third group of structure
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the third input terminal of the pitch, <C3.2> first stage third light is a third group of structure
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the third output terminal.
First-stage (n + 1) -th optical switch having a group configuration
Connected to the third input terminal of the 1st stage 2n optical switch
And, <C3.3> first stage third light is a third group of structure
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having three groups
To the third input terminals of the first to third optical switches, respectively.
Connect, <D1> first stage first optical Sui a first group of structure
Switches to first to third output terminals of the first to n-th optical switches
To the second stage first optical coupler through the first group configuration.
<D2> is connected to the input terminal of the second-stage third n-type optical coupler, and <D2> is the first-stage (n +
1) Optical switches to first to second stages of 1st to 2n optical switches
The third output terminal is connected to the second stage (3
n + 1) at the input end of the optical coupler to the second stage 6n optical coupler
Respectively connected, first stage is the configuration of the <D3> third group the (2n +
1) Optical switches to first to third nth optical switches
The third output terminal is connected to the second stage (6
n + 1) at the input end of the optical coupler to the second-stage ninth optical coupler
Each connected, <E1.1> second stage the first light is a first group of structure
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the first input terminal of the second-stage third-m optical switch.
Is connected, <E1.2> second stage the first light is a first group of structure
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The first and respectively connected to the input terminal, <E1.3> second stage the first light is a first group of the structure of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n-th output terminal are connected to the second group of the third group configuration.
(6m + 1) th optical switch to 2nd ninth optical switch
Respectively connected to the first input terminal of the switch, <E2.1> second stage the first light is the configuration of the second group
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the second input terminal of the second stage 3m optical switch.
Is connected, <E2.2> second stage the first light is the configuration of the second group
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The second was connected to the input terminals, <E2.3> second stage the first light is the configuration of the second group of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n-th output terminal are connected to the second group of the third group configuration.
(6m + 1) th optical switch to 2nd ninth optical switch
Respectively connected to the second input terminal of the switch, <E3.1> second stage the first light which is the third group of structure
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the third input terminal of the second stage 3m optical switch.
Is connected, <E3.2> second stage the first light which is the third group of structure
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The third respectively connected to the input terminal, <E3.3> second stage the first light which is the third group of the structure of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n output terminal are connected to the second group of the second group.
(6m + 1) th optical switch to 2nd ninth optical switch
Connected to the third input terminals of the
You.

Further, the optical distribution device according to the present invention comprises: <F1> a plurality of optical couplers of a third stage and a first group having 1 input and 3n output; and <F2> an optical coupler of a third stage and a second group having 1 input and 3n output. A plurality of optical couplers, <F3> a plurality of 1-input 3n-output third-stage third-group optical couplers, <G1> a 3-input 3-output third-stage first-group optical switches, <G2 <G3> A plurality of third-stage third-group optical switches having three inputs and three outputs are provided. <G3> A plurality of third-stage third group optical switches having three inputs and three outputs are provided. The optical switches of the second group and the third group equally distribute the other input when one or two of the inputs are abnormal, and output the same. <H> Second-stage first optical switch to second-stage A first output terminal , a second output terminal, and a third output terminal of the ninth optical switch Are connected to the input terminals of the third-stage first group, the second group, and the third group of optical couplers. <I1> The output terminal of the third-stage first group of optical couplers is the third-stage first group, <I2> The output terminals of the third-stage second-group optical couplers are connected to the third-stage first-group, second-group, and third-stage optical couplers. <I3> The output terminal of the third-stage third-group optical coupler is connected to the third-stage first-group, second-group, and third-group optical switches of the third-stage optical switch. It may be configured to be connected to the input terminal.

Further, the optical distribution device may include an optical amplifier for compensating for optical loss. The optical distribution device distributes the optical output to N pieces and the output becomes 1 / N. × N
An optical coupler may be provided.

Further, the optical distribution device includes a multi-stage optical distribution component stage, wherein an optical output of an optical transmitter is connected to an optical input of an optical switch of a first stage, and an optical output of an optical switch of a final stage is connected. The output may be connected to an optical input of an optical receiver.

[0024]

DETAILED DESCRIPTION OF THE INVENTION An optical distribution device according to the present invention
The present invention can be applied to an optical video distribution device used for an ATV device or the like.

FIG. 1 is a configuration diagram showing the connection of the entire system of the optical distribution device according to the first embodiment of the present invention.

In FIG. 1, IN is an input of the optical distribution device,
S is a 2 × 2 optical switch, C is a 1 × N optical coupler, OUT is the output of the optical distribution device, and the connection is composed of an optical fiber, an optical waveguide, or the like.

The input IN is connected to an optical transmitter (TX) for transmitting the optical signal shown in FIG.
An optical receiver (RX) is connected to T.

The 2 × 2 optical switch (S) has two inputs and two inputs.
This is an output optical switch that outputs to only one end of the output or outputs to both outputs equally depending on the voltage applied to the optical switch.

The 2 × 2 optical switch S is composed of a 1 × 2 optical switch and a 2 × 2 optical coupler C. In the system for transmitting two or more identical optical signals to the input of the 2 × 2 optical switch S, One optical output of the two optical outputs is connected to the other optical output.

The 1 × 2 optical switch is an optical switch in which one optical input / output and two optical inputs / outputs are opposed to each other, and this one optical input / output is connected to one of the two optical switches. is there.

The 1 × N optical coupler (C) converts the optical output to N
Distribute into pieces. Since the output is 1 / N, an optical amplifier (not shown) is connected. For example, a 1 × 4 optical coupler is
One optical input and four optical outputs are opposed to each other, and light input to one optical input is equally divided into four opposing optical outputs and output. Note that the 1 × N optical coupler (C) is represented by a 1 × 4 optical coupler for simplification of description,
Even with N, the effect does not change.

The present optical distribution device is characterized by the connection configuration of the entire system. In particular, the connection route of the entire configuration is configured as follows.

The present optical distribution device is provided with the above 2 × 2 optical switch S
And 1 × N optical couplers C in a tree-like configuration in multiple stages (here, first, second, and third stages), each of which includes a plurality of 1 × N optical couplers and 2 × N optical couplers. A × 2 optical switch S is provided. That is, the final stage (third stage)
A plurality of 2 × 2 output optical switches S, which are output terminals of the optical distribution device, and a 1 × N optical coupler C connected in front of the plurality of 2 × 2 output optical switches S,
The plurality of 2 × 2 output optical switches S and the plurality of 1 × N optical couplers C of the stage are equally divided into two groups, Group 1 and Group 2, and the 1 × N optical couplers C of one of the equally divided groups are divided.
Is connected to one of the 2 × 2 output optical switches S of the other group equally divided.

The higher-order light distribution configuration stage (second stage) of the last stage includes a plurality of 2 × 2 × 2 × 2 × 2
It has a two-output optical switch S and a 1 × N optical coupler C connected in front of the plurality of 2 × 2 output optical switches S, and has a plurality of 2 × 2 output optical switches S and 1 in the second stage. The × N optical coupler C is further divided into subgroups obtained by further dividing the group equally divided in the final stage (third stage), and one of the subgroups equally divided into subgroups.
The output of the × N optical coupler C is connected to one of the 2 × 2 output optical switches S of the other sub-group equally divided into sub-groups. For example, a plurality of 2 ×
The two-output optical switch S and the 1 × N optical coupler C are further divided into a sub-group 1 and a sub-group 2 obtained by dividing the third-stage group 1 into equal parts.
1 × N optical coupler C of one subgroup 1 equally divided into
Is connected to one of the 2 × 2 output optical switches S of the other subgroup 2. Similarly, the third
The subgroups obtained by further dividing the group 2 of the column into equal parts are a subgroup 1 ′ and a subgroup 2 ′.

Further, the light distribution component stage (first stage), which is the upper stage of the second stage, is the highest stage of the light distribution device.
A plurality of 2 × 2 output optical switches S serving as output ends of the stages, and one 2 × 2 output optical switch S connected to a stage preceding the plurality of 2 × 2 output optical switches S
A X × N optical coupler C and a 2 × 2 output optical switch S connected to a stage preceding the 1 × N optical coupler C and serving as an input terminal IN of the optical distribution device. The output optical switch S and the 1 × N optical coupler C are further divided into subgroups obtained by dividing the subgroup equally divided in the second stage into subgroups, and one of the subgroups equally divided into this subgroup. The output of the .times.N optical coupler C is connected to one of the 2.times.2 output optical switches S of the other sub-group which is further equally divided into sub-groups.
Is connected to the output of a 2 × 2 output optical switch S which is the input end IN of the optical distribution device.

As described above, in the optical distribution device according to the present embodiment, for example, the optical transmitter (TX) is connected to the input IN,
An optical receiver (RX) is connected to the output OUT as a terminal, and the configuration stages redundantly configured by the optical switch S and the 1 × N optical coupler C are configured in a tree-like configuration. The third stage is equally divided into two groups, and the input of the 2 × 2 optical switch S receives one output of the 1 × 4 optical coupler C from each of the two equally divided groups. The second stage further divides one of the two divided by the third stage into two, and divides the divided groups into 2 × so that the output of the 1 × 4 optical coupler C is 2 × so as to complement each other. It is connected to the input of the two-optical switch S. Similarly, the first stage is a 1 × 4 optical coupler C
And the 2 × 2 optical switches S are connected so as to complement each other.

That is, the optical distribution component stage is divided into a plurality of groups, and the input of the optical switch input to the own group among the divided groups is wired so as to be divided into another divided group, and the optical switch of the final stage is divided. The distribution configuration stage is divided into a plurality of groups, and the optical distribution configuration stage at the uppermost stage of the final stage divides the group divided at the last stage into subgroups that are further equally divided. Wiring to repeat until.

Hereinafter, the operation of the optical distribution device configured as described above will be described.

The above connection configuration can be used for an optical distribution device, and the optical distribution device having the above configuration branches the same signal and distributes the same signal to many terminals.

In FIG. 1, the same transmitter (not shown) is connected to each input of the input IN, and the same signal is transmitted. When the same signal is normal, the 2 × 2 optical switch S outputs each input signal to the corresponding output. When one of the signals is abnormal, the 2 × 2 optical switch S becomes a 1 × 2 optical coupler to input a normal input. The output is divided equally into each output. The output is amplified by an optical amplifier (not shown) and continues to the next stage. Such an operation is repeated up to n stages, here up to the third stage.

In the last stage, that is, the third stage, all terminals can operate normally if half of the routes are connected to the 1 × 4 optical coupler C. Here, it is assumed that the connections of the optical couplers C of group 1 are all normal.

Here, in the second stage, which is higher in group 1, group 1 is further divided into two subgroups.
Since the input of the optical switch S is wired so as to be divided in each subgroup, if all the optical couplers C in one subgroup operate normally, all terminals can operate normally. Here, it is assumed that the connection of the optical coupler C of the subgroup 1 is normal. In order for the subgroup 1 to operate normally, one of the input terminals of the optical switch S input to the subgroup only needs to be normal.

Therefore, it is only necessary that one of the wirings from the input IN of the optical transmitter is normal.

Now, assuming that the system shown in FIG. 1 is up to the second stage, the subgroup 1 'on the group 2 side is assumed.
Must be normal. And
First stage optical switch S connected to subgroup 1 '
One of the inputs must work. However, as shown in FIG. 1, when the third stage is connected in the above-described configuration, the lower stage compensates for a terminal failure. Therefore, by connecting the lower stage by the connection method, the upper stage is connected. It can be said that the obstacle avoidance power of the step has increased.

FIGS. 2 to 4 are diagrams showing other wiring routes that adopt the above-described connection method. The basic connection method is shown in FIG.
Is the same as In this example, how to divide the constituent stages into two groups and the location of connection with other groups are changed. The effect is the same.

FIG. 5 to FIG. 7 are views showing an example in which connection is made without using the above-described configuration, and are for comparison with the present embodiment.

As shown in FIGS. 5 to 7, the lower stage does not operate normally unless the route of the upper stage operates more. That is, in the connection examples of FIGS. 5 to 7, the connection route is merely a tree-like configuration. For example, in FIG. 5, if any of the routes from the input IN has an abnormality, The effect of the abnormal route is not recovered and the fault remains in the lower stage.

On the other hand, in the present embodiment, the failure in the terminal can be compensated in the lower stage by connecting in the above-described configuration, so that as the number of stages in the system increases, the failure in the upper stage is avoided. be able to.

As described above, the optical distribution device according to the first embodiment is composed of the optical distribution component stages in which the 2 × 2 optical switches S and the 1 × N optical couplers C are arranged in multiple stages in a tree shape.
The third stage is equally divided into two groups, and the 2 × 2 optical switch S
Input from each of the two equally divided groups is 1 ×
The outputs of the four optical couplers C are input one by one.
The output of the 1 × 4 optical coupler C is connected to the input of the 2 × 2 optical switch S so that one of the two divided by the stage is further divided into two, and the further divided groups complement each other. 1 × 4 optical coupler C
And the 2 × 2 optical switches S are connected so as to complement each other. In this way, the optical distribution component stage is divided into a plurality of groups, and the input of the optical switch input to the own group among the divided groups is input. Are divided so as to be divided into other groups, and the final light distribution component stage is divided into a plurality of groups, and the upper light distribution component stage of the final stage further includes the group divided in the final stage. Since the wiring is divided into equally divided subgroups, and the above configuration is wired so as to be repeated up to the upper stage, the more stages of the system, the more the lower stage can compensate for the failure. Higher fault routes can be compensated more.

Further, only the connection route is set to the configuration of this embodiment (FIGS. 1 to 4), and other configurations (FIGS. 5 to 7)
More redundancy is enhanced. Also, since only the route connection needs to be changed, no additional hardware is required. For this reason, it is possible to compensate for a failure in the upper node without increasing the cost.

Here, the above-mentioned optical distribution configuration stage may be configured to have a multi-stage redundant configuration. With such a configuration, higher fault routes can be compensated more, and the redundant configuration of the entire system can be enhanced. it can.

Therefore, when the optical distribution device having such excellent features is applied to an optical video distribution device, the system and configuration of the optical distribution device can be reduced. In particular, an optical CATV device or the like can be used. It is suitable for application to an optical image distribution device.

FIG. 8 is a diagram showing a configuration of an optical switch used in the optical distribution device according to the second embodiment of the present invention, which is applied to an optical distribution device in a system for transmitting an odd number of identical optical signals. It is an example.

In FIG. 8, the 3 × 3 optical switch is 1 ×
2 optical switch (S1), 2 × 1 optical switch (S2), 3
It consists of a × 3 optical coupler (C3).

In the 1 × 2 optical switch (S1), one optical input / output and two optical inputs / outputs are opposed to each other, and this one optical input / output is connected to one of the two switches by switching. An optical switch.

In the 3 × 3 optical coupler (C3), three light input / outputs and three light input / outputs are opposed to each other. The light input from the other of the three light input / outputs is equally divided and output to three opposing light input / outputs.

In the above configuration, when all of the inputs of the optical switch are normal, the 3 × 3 optical switch has a 1 × 2 input.
Optical switch (S1) (hereinafter referred to as input optical switch)
And an output 2 × 1 optical switch (S2) (hereinafter referred to as an output optical switch) mutually select a partner.

When one input of the optical switch is abnormal, the optical switch having the abnormal input selects the opposing output optical switch, and the output optical switch selects the optical coupler (C3).
One of the input optical switches of normal input is an optical coupler (C
The optical switch that selects 3) and opposes its input optical switch selects the optical coupler (C3), and the other normal input optical switches select each other.

When two inputs of the optical switch are abnormal, the input side optical switch to which the normal input is input is connected to the optical coupler (C
3) connected to the output side optical switch is an optical coupler (C3)
Select

The 3 × 3 optical switch performing the above operation is replaced with the 2 × 2 optical switch S of the optical distribution device according to the first embodiment.
Used in place of In the first embodiment, the 1 × N optical coupler C is an example in which the 1 × 4 optical coupler is applied.
In the present embodiment, N is an odd number, for example, used instead of a 1 × 3 optical coupler.

Accordingly, the present optical distribution device has the following configuration in the entire system.

The present optical distribution device comprises an optical distribution configuration stage (for example, a first stage, a second stage, and a third stage) in which the 3 × 3 optical switch and the 1 × 3 optical coupler are configured in a multi-stage in a tree shape. The final stage (third stage) is composed of a plurality of 3 × output terminals of the optical distribution device.
A plurality of 3 × 3 optical switches and a 1 × 3 optical coupler connected in front of the plurality of 3 × 3 optical switches, and the third plurality of 3 × 3 optical switches and the plurality of 1 × 3 optical couplers , Divided into three groups of groups 1, 2, 3
The output of one equally divided group of 1 × 3 optical couplers is
It is configured to be connected to one of the 3 × 3 optical switches of another group divided into three.

Further, the light distribution configuration stage (second stage) of the upper stage of the final stage is composed of a plurality of 3 × output terminals OUT of the second stage.
A plurality of 3 × 3 optical switches and a 1 × 3 optical coupler connected in front of the plurality of 3 × 3 optical switches, and the second plurality of 3 × 3 optical switches and the 1 × 3 optical coupler,
In the final stage (third stage), the group divided into three equal parts is further divided into three equal sub-groups, and the output of the 1 × 3 optical coupler of one sub-group divided into three equal sub-groups is It is configured to be connected to one of the 3 × 3 optical switches of another sub-group divided into three equal parts.

Further, the upper light distribution configuration stage (first stage) of the second stage is the highest stage of the optical distribution device, and the first stage is the first stage.
A plurality of 3 × 3 optical switches serving as output terminals of a stage, a 1 × 3 optical coupler connected before the plurality of 3 × 3 optical switches, and an optical distribution device connected before the 1 × 3 optical coupler And a 3 × 3 optical switch serving as an input terminal IN of
The plurality of 3 × 3 optical switches and 1 × 3 optical couplers in the second stage are further divided into three equal sub-groups of the sub-group divided into three in the second stage. The output of the 1 × 3 optical coupler of one equally divided sub-group is further connected to one of the 3 × 3 optical switches of another sub-group equally divided into three sub-groups, and the uppermost 1 × 3 optical coupler is connected. The coupler is a 3 × input terminal IN of the optical distribution device.
It is configured to be connected to the output of the three-optical switch.

With the above configuration, the following effects can be obtained. That is, in the optical distribution device according to the first embodiment, the optical switch is 2 ×
Since the optical switch is a two-optical switch, the connection between the optical coupler and the optical switch is smooth when the optical coupler is an even number, but the configuration is difficult when the optical coupler is an odd number. In the case of an odd number, as in the present embodiment, the optical switch may have a 3 × 3 optical switch configuration as shown in FIG. 8, a configuration in which the group is divided into three, and a configuration in which the three groups compensate each other. Operate in the same manner as in the first embodiment.

Accordingly, an effect can be obtained in which N can be applied even if N of the 1 × N optical coupler is an odd number of 2 or more.

The optical distribution device according to each of the above embodiments can be applied to the optical video distribution device and the like as described above. However, the present invention is not limited to this, and any communication system that transmits and receives light can be used. It goes without saying that it can be applied to all devices.

Further, it goes without saying that the number, type, number, connection method, and the like of the inputs and outputs of the optical switches and optical couplers constituting the optical distribution device are not limited to the above-described embodiments.

[0069]

The optical distribution device according to the present invention includes an optical distribution component stage composed of multiple stages in a tree shape. The optical distribution component stage outputs an optical switch and an output of the optical switch to N (N is an arbitrary integer). ) A 1 × N optical coupler for distributing the light output to the book;
One of the two optical outputs is connected to the input of the optical switch, and the other optical output is connected to the other input of the optical switch. In a normal state, the light input from one input of the optical switch is transmitted to the optical switch. And output only to one output of the optical switch, the light input from the other input of the optical switch is output only to the other output of the optical switch, and when one of the inputs is abnormal,
A redundant configuration in which the other optical input of the optical switch is equally divided and output to the output of the optical switch,
The optical switch is divided into multiple groups and the input of the optical switch input to the divided group is configured so that the divided groups compensate each other. Can be built.

In particular, as the number of stages in the system increases, faults can be compensated for in the lower stages, and each time the system is expanded, higher fault routes can be compensated more.

Further, since only connection routes are limited, the present invention can be implemented without adding hardware or the like, and a failure in an upper node can be compensated without increasing costs.

[Brief description of the drawings]

FIG. 1 is a configuration diagram showing a connection of an entire system of an optical distribution device according to a first embodiment to which the present invention is applied.

FIG. 2 is a configuration diagram showing another connection of the entire system of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 3 is a configuration diagram showing another connection of the entire system of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 4 is a configuration diagram showing another connection of the entire system of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 5 is a configuration diagram illustrating a connection for explaining an effect of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 6 is a configuration diagram showing a connection for explaining an effect of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 7 is a configuration diagram illustrating a connection for explaining an effect of the optical distribution device according to the first embodiment to which the present invention is applied.

FIG. 8 is a configuration diagram of an optical switch of an optical distribution device according to a second embodiment to which the present invention has been applied.

FIG. 9 is a configuration diagram illustrating an overall configuration of a frequency division multiplexing optical subscriber transmission system.

FIG. 10 is an AM of a frequency division multiplexing optical subscriber transmission system.
It is a figure showing the detailed composition of P / BRC.

FIG. 11 is a diagram showing a configuration of a conventional light distribution device.

[Explanation of symbols]

IN Optical distribution unit input, S 2 × 2 optical switch, C
1 × N optical coupler, OUT Output of optical distribution device

Claims (4)

(57) [Claims] 1. A 1-input 2n-output (n is a positive integer) first signal
1st stage optical coupler and 1st stage 2nd optical coupler, 1st stage 1st optical switch with 2 inputs and 2 outputs to 1st stage 2n
An optical switch, a 1st input 2n output second stage first optical coupler to a second stage 4n
An optical coupler, a 2nd stage 1st optical switch having 2 inputs and 2 outputs to a 2nd stage 4m
(Where m is a positive integer) an optical switch, wherein the first-stage first optical switch to the first-stage second optical switch and
The second stage first optical switch to the second stage fourth optical switch are:
When one of the inputs is abnormal, the other input is equally distributed and output
And is input to the first stage first optical coupler or the first stage second optical coupler
Optical signals are transmitted from the first stage first optical switch to the first stage second optical switch.
2nd stage 1st optical coupler to 2nd stage 4th
n optical couplers, the second stage first optical switch through the second stage
In the optical distribution device output from the 2nd stage optical switch
Te, <A1> first stage first optical coupler, and the first stage first light
Switch to the first-stage n-th optical switch,
Configuration and then, <A2> first stage second optical coupler, and the first stage the (n
+1) The first to second-stage optical switches from the first stage to the first stage
The structure of the second group, which is different from the group,
And, <B1> the second stage first optical coupler to the second-stage second 2n optical coupler
And second stage first optical switch to second stage second optical switch
The switches are configured as a first group, and <B2> second stage (2n + 1) optical coupler to second stage
4n optical coupler and second stage (2m + 1) optical switch
H to the second-stage 4m optical switch in the second group configuration
And then, <C1> first stage first optical coupler is a first group of structure
A first output terminal to an n-th output terminal of the first group
1st stage first optical switch to 1st stage nth optical switch
And <C2> a first-stage first optical cap, which is a configuration of a first group.
The (n + 1) th output terminal to the ( 2n ) th output terminal of the
First to (n + 1) th optical switches to
<C3> a first-stage second optical switch which is connected to a first input terminal of a first-stage second optical switch,
A first output terminal to an n-th output terminal of the first group
1st stage first optical switch to 1st stage nth optical switch
And <C4> a first-stage second optical cap having a second group configuration.
The (n + 1) th output terminal to the (2n) th output terminal of the
First to (n + 1) th optical switches to
<D1> a first-stage first optical switch which is connected to the second input terminal of the first-stage second-n optical switch,
Switch to the first output terminal and the second output terminal of the first-stage n-th optical switch.
The first end is a second-stage first optical coupler having a first group configuration.
<D2> are connected to the input terminals of the second-stage and second-n optical couplers, respectively. <D2> The first-stage (n +
1) The first output of the optical switch to the first-stage 2n-th optical switch
Terminal and the second output terminal are connected to a second stage of a second group configuration.
Input of (2n + 1) -th optical coupler through second-stage fourth-n optical coupler
Respectively connected to the force terminal, <E1> second stage first optical coupler is a first group of structure
To the first to n-th outputs of the second to second n-th optical couplers
The second end of the first optical switch having a first group configuration
To the first input terminal of the second-stage second-m optical switch.
Continued to, <E2> second stage first optical coupler is a first group of structure
To the (n + 1) -th output terminal of the second to second n-th optical couplers
The 2n-th output terminal is connected to the second stage of the second group configuration.
(2m + 1) optical switch to second stage 4m optical switch
<E3> are connected to the first input terminals, respectively. <E3> The second stage (2n +
1) The first output terminal of the optical coupler or the second stage 4n optical coupler
The n-th output terminal is connected to the second stage first stage which is a second group configuration.
Optical switch to the second input terminal of the second stage 2m optical switch
Each connected, <E4> second stage is the configuration of the second group the (2n +
1) (n + 1) th of the optical coupler to the second stage and the 4nth optical coupler
The output terminal to the 2n-th output terminal constitute a second group.
2nd stage (2m + 1) optical switch to 2nd stage 4m optical switch
Connected to the second input terminals of the switch .
Light distribution device. 2. <F1> Third Stage First with 1 Input and 2n Output
A plurality of optical couplers of the group, <F2> optical couplers of the third stage and the second group of 1 input 2n output
A plurality of plug, the <G1> 2 input 2 third stage the first group of output light Sui
A plurality of pitch, <G2> 2-input 2 third stage a second group of output light Sui
A plurality of pitch, <G3> optical switch and third stage of the third stage first group
The second group of optical switches is used when one of the inputs is abnormal.
By equally distributing the other input to output, <H> the second stage the first optical switch to the second stage first 2m light Sui
The first output terminal and the second output terminal of the switch are connected to a third stage first glue.
Of the optical coupler of the third stage and the optical coupler of the second group of the third stage
Connected to the end, <I1> output end of the optical coupler of the third stage the first group is the
Three-stage first group optical switch and third-stage second group
Is connected to the one input terminal of the optical switch, <I2> output end of the optical coupler of the third-stage second group third
Three-stage first group optical switch and third-stage second group
And connected to the other input terminal of the optical switch
The optical distribution device according to claim 1. 3. A 1-input 3n-output (n is a positive integer) first signal
1st stage optical coupler to 1st stage 3rd optical coupler, 1st stage 1st optical switch to 1st stage 3n with 3 inputs and 3 outputs
An optical switch, a 1st input 3n output second stage first optical coupler to a second stage 9n
An optical coupler, a second-stage first optical switch having three inputs and three outputs to a second-stage 9m
(M is a positive integer), and a first-stage first optical switch to a first-stage third-n optical switch;
The second stage first optical switch to the second stage 9m optical switch are:
When one or two inputs are abnormal, the other input is equally distributed
And output to the first-stage first optical coupler to the first-stage third optical coupler.
Optical signals are transmitted from the first stage first optical switch to the first stage third optical switch
The second stage first optical coupler to the second stage ninth through the switch
n optical couplers, the second stage first optical switch through the second stage
Optical distributor odor output from stage a 9m beam switch
Te, <A1> first stage first optical coupler, and the first stage first light
Switch to the first-stage n-th optical switch,
Configuration and then, <A2> first stage second optical coupler, and the first stage the (n
+1) The first to second-stage optical switches from the first stage to the first stage
The structure of the second group, which is different from the group,
And, <A3> first stage third optical coupler, and the first stage the (2
(n + 1) optical switch through first-stage third-n optical switch
A third configuration different from the first and second groups
A group of structure, <B1> the second stage first optical coupler to the second-stage second 3n light coupler
And second stage first optical switch to second stage third optical switch
The switches are configured as a first group, and <B2> second stage (3n + 1) optical coupler to second stage
6n optical coupler and second stage (3m + 1) optical switch
H to the second stage 6m optical switch, the second group configuration
And then, <B3> second stage the (6n + 1) optical coupler to the second-stage second
9n optical coupler and second stage (6m + 1) optical switch
The second to ninth optical switches are arranged in a third group.
And then, <C1.1> first stage the first light is a first group of structure
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the first input terminal of the pitch, <C1.2> first stage the first light is a first group of structure
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the second
First-stage (n + 1) -th optical switch having a group configuration
Connected to the first input terminal of the 1st stage 2n optical switch
And, <C1.3> first stage the first light is a first group of structure
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having three groups
To the first input terminals of the first to third stage optical switches, respectively.
Connect, <C2.1> first stage second light is a structure of the second group
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the second input terminal of the pitch, <C2.2> first stage second light is a structure of the second group
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the second
First-stage (n + 1) -th optical switch having a group configuration
Connected to the second input terminal of the 1st stage 2n optical switch
And, <C2.3> first stage second light is a structure of the second group
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having two groups
To the second input terminals of the first to third n optical switches, respectively.
Connect, <C3.1> first stage third light is a third group of structure
The first output terminal to the n-th output terminal of the coupler are connected to the first group.
1st stage first optical switch to 1st stage nth optical switch
Respectively connected to the third input terminal of the pitch, <C3.2> first stage third light is a third group of structure
The (n + 1) th output terminal to the (2n) th output terminal of the coupler are connected to the third output terminal.
First-stage (n + 1) -th optical switch having a group configuration
Connected to the third input terminal of the 1st stage 2n optical switch
And, <C3.3> first stage third light is a third group of structure
The (2n + 1) th output terminal to the 3nth output terminal of the coupler are connected to the
The first stage (2n + 1) optical switch having three groups
To the third input terminals of the first to third optical switches, respectively.
Connect, <D1> first stage first optical Sui a first group of structure
Switches to first to third output terminals of the first to n-th optical switches
To the second stage first optical coupler through the first group configuration.
<D2> is connected to the input terminal of the second-stage third n-type optical coupler, and the first-stage (n +)
1) Optical switches to first to second stages of 1st to 2n optical switches
The third output terminal is connected to the second stage (3
n + 1) at the input end of the optical coupler to the second stage 6n optical coupler
Respectively connected, first stage is the configuration of the <D3> third group the (2n +
1) Optical switches to first to third nth optical switches
The third output terminal is connected to the second stage (6
n + 1) at the input end of the optical coupler to the second-stage ninth optical coupler
Each connected, <E1.1> second stage the first light is a first group of structure
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the first input terminal of the second-stage third-m optical switch.
Is connected, <E1.2> second stage the first light is a first group of structure
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The first and respectively connected to the input terminal, <E1.3> second stage the first light is a first group of the structure of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n-th output terminal are connected to the second group of the third group configuration.
(6m + 1) th optical switch to 2nd ninth optical switch
Respectively connected to the first input terminal of the switch, <E2.1> second stage the first light is the configuration of the second group
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the second input terminal of the second stage 3m optical switch.
Is connected, <E2.2> second stage the first light is the configuration of the second group
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The second was connected to the input terminals, <E2.3> second stage the first light is the configuration of the second group of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n-th output terminal are connected to the second group of the third group configuration.
(6m + 1) th optical switch to 2nd ninth optical switch
Respectively connected to the second input terminal of the switch, <E3.1> second stage the first light which is the third group of structure
Coupler to first output end to n-th optical coupler
The output terminal is connected to the first optical switch of the second stage, which is the configuration of the first group.
Switch to the third input terminal of the second stage 3m optical switch.
Is connected, <E3.2> second stage the first light which is the third group of structure
(N + 1) th output terminal of the coupler to the second stage and the 3nth optical coupler
Through 2n output terminals to the second stage of the second group configuration.
(3m + 1) optical switch to second stage 6m optical switch
The third respectively connected to the input terminal, <E3.3> second stage the first light which is the third group of the structure of
The (2n + 1) th output of the coupler to the 2nd stage 3n optical coupler
Terminal to the 3n output terminal are connected to the second group of the second group.
(6m + 1) th optical switch to 2nd ninth optical switch
Light connected to the third input terminals of the
Dispensing device. 4. <F1> Third Stage First with 1 Input and 3n Output
<F2> a plurality of third-stage third-group optical couplers having 1 input and 3n output, and a plurality of third-stage third group optical couplers having 1 input and 3n output. <G1> A plurality of optical switches of a third-stage first group having three inputs and three outputs are provided. <G2> A plurality of optical switches of a third-stage second group having three inputs and three outputs are provided. <G3> Three-input three outputs are provided. A plurality of optical switches of the third stage and the third group are provided. <G4> The optical switches of the third stage, the first group, the second group, and the third group, when one or two of the inputs are abnormal, the other switches <H> The first output terminal , the second output terminal, and the third output terminal of the second-stage first optical switch to the second-stage 9m optical switch are connected to the third-stage first optical switch. Connected to the input end of the group, second group, and third group optical coupler <I1> an output terminal of the third-stage first-group optical coupler is connected to the first-input terminals of the third-stage first-group, second-group, and third-group optical switches; <I2> third-stage The output end of the second group of optical couplers is connected to the second input end of the third-stage first group, the second group, and the third group of optical switches. <I3> The third-stage third group of optical couplers 4. The optical distribution device according to claim 3, wherein the output terminal is connected to the third input terminals of the third-stage first group, the second group, and the third group of optical switches.