CONTROL SIGNAL MULTIPLEXING APPARATUS, CONTROL SIGNAL RECEIVING APPARATUS, CONTROL SIGNAL MULTIPLEXING METHOD, AND CONTROL SIGNAL RECEIVING METHOD
The control signal multiplexing device includes a modulation unit that performs polarization modulation of an optical signal for carrying a main signal with a control signal.
1 . A control signal multiplexing device comprising:
a modulator configured to perform polarization modulation of an optical signal for carrying a main signal with a control signal.
2 . The control signal multiplexing device according to claim 1 , wherein
the modulator performs the polarization modulation of the optical signal by switching a modulation pattern based on the control signal, and
in the modulation pattern, a range of a polarization angle is wider than a range of polarization variation which may occur in a transmission line of the optical signal, or a frequency of change of the polarization angle is higher than a frequency of the polarization variation.
3 . The control signal multiplexing device according to claim 2 , wherein
the modulation pattern has a frequency or a variation range capable of polarization compensation in a device of a transmission destination of the optical signal.
4 . The control signal receiving device comprising:
a decoder configured to decode a control signal based on a polarization state of an optical signal for carrying a main signal.
5 . The control signal receiving device according to claim 4 , comprising:
a compensator configured to compensate for polarization of the optical signal; and
a modulator configured to perform polarization modulation of the optical signal whose polarization is compensated by a new control signal.
6 . A control signal multiplexing or decoding method comprising:
performing polarization modulation of an optical signal for carrying a main signal with a control signal or decoding a control signal based on a polarization state of an optical signal for carrying a main signal.
7 . (canceled)