Abstract: Optical transmission equipment includes an optical transceiver circuit that transmits and receives signal light and supervisory light, a forward Raman amplifier provided at a transmitter end of the optical transceiver circuit, a backward Raman amplifier provided at a receiver end of the optical transceiver circuit, and a processor that controls the forward Raman amplifier and the backward Raman amplifier. When a counterpart backward Raman amplifier or a counterpart forward Raman amplifier provided at an opposite side through a fiber-optic transmission line is started up, the processor turns off a power of the forward Raman amplifier or the backward Raman amplifier according to a supervisory signal received from the fiber-optic transmission line, and releases an off state of the forward Raman amplifier or the backward Raman amplifier after a predetermined period of time.

Abstract: An optical node device includes: an optical switch coupled to a multicore fiber that has N (N is an integer of 2 or more) cores; a multiplexer-demultiplexer coupled to a single-core fiber that multiplexes and transmits optical signals in M (M is an integer of 2 or more; and M?N) bands; a maximum of (M?1) wavelength converters provided between the optical switch and the multiplexer-demultiplexer; and a control circuit that controls the optical switch, the wavelength converter or both of the optical switch and the wavelength converter and the control circuit controls the optical switch or the wavelength converter or both of the optical switch and the wavelength converter such that, of the optical signals in the M bands, an optical signal in at least one band is not subject to wavelength conversion and an optical signal in another band is subject to the wavelength conversion.