Reconfigurable optical add-drop multiplexer apparatus

1. A reconfigurable optical add-drop multiplexer apparatus, comprising:

a first input end, a first output end, a second input end, a second output end, a first downloading end, a second downloading end, a first uploading end, and a second uploading end, wherein

the first input end is connected to an input end of a first optical amplifier, an output end of the first optical amplifier is connected to an input end of a first reconfigurable optical add-drop multiplexer ROADM, and an output end of the first ROADM is connected to the first output end;

the first uploading end is connected to an input end of a third optical amplifier, an output end of the third optical amplifier is connected to an uploading end of the first ROADM, and a downloading end of the first ROADM is connected to the first downloading end;

the second input end is connected to an input end of a second optical amplifier, an output end of the second optical amplifier is connected to an input end of a second ROADM, and an output end of the second ROADM is connected to the second output end;

the second uploading end is connected to an input end of a fourth optical amplifier, an output end of the fourth optical amplifier is connected to an uploading end of the second ROADM, and a downloading end of the second ROADM is connected to the second downloading end;

a first coupler is disposed between the output end of the first ROADM and the first output end, wherein a first input end of the first coupler is connected to the output end of the first ROADM, and a first output end of the first coupler is connected to the first output end;

a second coupler is connected between the output end of the second ROADM and the second output end, wherein a first input end of the second coupler is connected to the output end of the second ROADM, and a first output end of the second coupler is connected to the second output end;

a third coupler is connected between the downloading end of the first ROADM and the first downloading end, wherein a first input end of the third coupler is connected to the downloading end of the first ROADM, and a first output end of the third coupler is connected to the first downloading end; and

a fourth coupler is connected between the downloading end of the second ROADM and the second downloading end, wherein a first input end of the fourth coupler is connected to the downloading end of the second ROADM, and a first output end of the fourth coupler is connected to the second downloading end, wherein

a second input end of the first coupler is connected to a first input end of a splitting coupler, a second input end of the second coupler is connected to a first output end of the splitting coupler, a second input end of the third coupler is connected to a second input end of the splitting coupler, and a second input end of the fourth coupler is connected to a second output end of the splitting coupler; and

the splitting coupler is configured to couple a reverse optical signal received by the first output end or the first downloading end and return the coupled reverse optical signal to the second output end for outputting;

or, couple a reverse optical signal received by the second output end or the second downloading end and return the coupled reverse optical signal to the first output end for outputting;

or, couple a reverse optical signal received by the first output end or the first downloading end and return the coupled reverse optical signal to the second downloading end for outputting;

or, couple a reverse optical signal received by the second output end or the second downloading end and return the coupled reverse optical signal to the first downloading end for outputting.

2. The apparatus according to claim 1 , wherein the reconfigurable optical add-drop multiplexer apparatus further comprises: four command receiving modules and one control module:

a first command receiving module disposed between the first input end and the first optical amplifier, wherein an input end of the first command receiving module is connected to the first input end, and an output end of the first command receiving module is connected to the input end of the first optical amplifier;

a second command receiving module disposed between the second input end and the second optical amplifier, wherein an input end of the second command receiving module is connected to the second input end, and an output end of the second command receiving module is connected to the input end of the second optical amplifier;

a third command receiving module disposed between the first uploading end and the third optical amplifier, wherein an input end of the third command receiving module is connected to the first uploading end, and an output end of the third command receiving module is connected to the input end of the third optical amplifier; and

a fourth command receiving module disposed between the second uploading end and the fourth optical amplifier, wherein an input end of the fourth command receiving module is connected to the second uploading end, and an output end of the fourth command receiving module is connected to the input end of the fourth optical amplifier, wherein

a control command output end of the first command receiving module, a control command output end of the second command receiving module, a control command output end of the third command receiving module, and a control command output end of the fourth command receiving module are all connected to the control module, and are configured to input a control command to the control module according to a received path connectivity signal, and the control module is further connected to the first ROADM and the second ROADM, and is configured to convert the control command into a control signal and send the control signal to the first ROADM or the second ROADM, so as to change a reconfiguration state of a corresponding ROADM.

3. The apparatus according to claim 2 , wherein each command receiving module comprises:

a splitter and a photodiode, wherein

an input end of the splitter is correspondingly connected to the first input end, the second input end, the first uploading end, or the second uploading end; an input end of the photodiode is coupled to a first output end of the splitter; a second output end of the splitter is connected to an input end of a corresponding optical amplifier; and an output end of the photodiode is connected to the control module, and is configured to convert a path connectivity signal output by the splitter into a control command and output the control command to the control module.

4. The apparatus according to claim 3 , wherein a filter is connected in series between the splitter and the photodiode.

5. The apparatus according to claim 2 , wherein the splitting coupler is a 2×2 optical switch, and the 2×2 optical switch is connected to the control module, and is configured to change a switch state under control of the control module, and couple a reverse optical signal generated by the first output end or the first downloading end and return the coupled reverse optical signal to the second output end for outputting;

or, couple a reverse optical signal generated by the second output end or the second downloading end and return the coupled reverse optical signal to the first output end for outputting;

or, couple a reverse optical signal generated by the first output end or the first downloading end and return the coupled reverse optical signal to the second downloading end for outputting;

or, couple a reverse optical signal generated by the second output end or the second downloading end and return the coupled reverse optical signal to the first downloading end for outputting, wherein

the switch state comprises a crossed state and a parallel state.

6. The apparatus according to claim 1 , wherein the splitting coupler is a 2×2 coupler.

7. The apparatus according to claim 1 , wherein

the first input end, the second input end, the first uploading end, and the second uploading end are configured to input a detection signal; and

the reverse optical signal comprises back scattering light of the detection signal received by at least one port at the first output end, the second output end, the first downloading end, and the second downloading end.

8. The apparatus according to claim 7 , wherein

the reverse optical signal further comprises: a selectively reflected part of detection signals received by at least one port at the first output end, the second output end, the first downloading end, and the second downloading end;

at least one of the first coupler, the second coupler, the third coupler, and the fourth coupler is a 2×2 coupler;

a second output end of the 2×2 coupler is connected to an input end of one attenuator, and an output end of the attenuator is connected to one wavelength-selective reflector; and

the wavelength-selective reflector is configured to selectively reflect a part of detection signals to form the reverse optical signal.