Communication apparatus and power use method

1. A communication apparatus for performing communication via an optical fiber, the communication apparatus comprising:

a transceiver;

a photoelectric converter configured to perform photoelectric conversion;

a functional unit, implemented using one or more computing devices, configured to operate using electricity from the photoelectric converter;

a switch configured to output, to the transceiver or the photoelectric converter, an optical signal input from the optical fiber connected to the communication apparatus; and

a state detector, implemented using one or more computing devices, configured to instruct the switch to switch an output destination of the optical signal based on information of a time allocated to the communication apparatus for transmission and/or reception,

wherein the photoelectric converter is configured to convert the optical signal from the switch into electricity through the photoelectric conversion.

2. The communication apparatus according to claim 1 , further comprising:

an electricity storage unit configured to store the electricity converted from the optical signal by the photoelectric converter.

3. The communication apparatus according to claim 2 , wherein the state detector is configured to determine whether current time is a transmission/reception timing based on the information of the time allocated to the communication apparatus for transmission and/or reception.

4. The communication apparatus according to claim 3 , wherein the state detector is configured to, based on a determination that the current time is not the transmission/reception timing, instruct the functional unit to sleep.

5. The communication apparatus according to claim 4 , wherein the transceiver is configured to instruct the switch to output the optical signal to the photoelectric converter to thereby cause the the photoelectric converter to covert the optical signal into the electricity, supply the electricity to the functional unit, and cause excess electricity to be stored in the electricity storage unit.

6. The communication apparatus according to claim 3 , wherein the state detector is configured to, based on a determination that the current time is the transmission/reception timing, instruct the electricity storage unit to discharge the electricity to be supplied to the functional unit.

7. The communication apparatus according to claim 6 , wherein the state detector is configured to instruct (i) the functional unit to be activated and (ii) the switch to output a next optical signal.

8. The communication apparatus according to claim 1 ,

wherein the transceiver is configured to:

acquire, from an optical signal received from the switch, the information of the time allocated to the communication apparatus for transmission and/or reception, and notify the state detector regarding the information.

9. An electricity use method performed by a communication apparatus including a transceiver, a photoelectric converter, a functional unit, a switch, a state detector, and an electricity storage unit to perform communication via an optical fiber, the electricity use method comprising:

outputting, to the transceiver or the photoelectric converter, an optical signal input from the optical fiber connected to the communication apparatus;

instructing the switch to switch an output destination of the optical signal based on information of a time allocated to the communication apparatus for transmission and/or reception;

converting, by the photoelectric converter, the optical signal from the switch into electricity through photoelectric conversion;

storing, by the electricity storage unit, the electricity converted from the optical signal by the photoelectric converter; and

operating, by the functional unit, using the electricity converted from the optical signal by the photo electric converter.

10. The electricity use method according to claim 9 , further comprising:

acquiring, from an optical signal received from the switch, the information of the time allocated to the communication apparatus for transmission and/or reception, by the transceiver; and

notifying, by the transceiver, the state detector regarding the information.

11. The electricity use method according to claim 9 , further comprising:

determining, by the state detector, whether current time is a transmission/reception timing based on the information of the time allocated to the communication apparatus for transmission and/or reception.

12. The electricity use method according to claim 11 , further comprising:

instructing, based on a determination that the current time is not the transmission/reception timing, the functional unit to sleep, by the state detector.

13. The electricity use method according to claim 12 , further comprising:

instructing, by the transceiver, the switch to output the optical signal to the photoelectric converter to thereby cause the the photoelectric converter to covert the optical signal into the electricity, supply the electricity to the functional unit, and cause excess electricity to be stored in the electricity storage unit.

14. The electricity use method according to claim 11 , further comprising:

instructing, based on a determination that the current time is the transmission/reception timing, the electricity storage unit to discharge the electricity to be supplied to the functional unit, by the state detector.

15. The electricity use method according to claim 14 , further comprising:

instructing, by the state detector, (i) the functional unit to be activated and (ii) the switch to output a next optical signal.