Optical transmission device and method

An optical transmission method comprising:

• receiving a wavelength division multiplexed optical signal obtained by dividing an optical packet signal and performing wavelength multiplexing;
• determining routing information that corresponds to an optical signal transmitted by the wavelength division multiplexed optical signal, on the basis of respective optical power levels of respective optical signals included in the wavelength division multiplexed optical signal;
• and
• transmitting the wavelength division multiplexed optical signal to a route corresponding to the routing information.

An optical transmission device that receives a wavelength division multiplexed optical signal and that transmits the received wavelength division multiplexed optical signal, the optical transmission device comprising:

• a delay fiber configured to delay the received wavelength division multiplexed optical signal by a prescribed time;
• an optical switch configured to transmit the wavelength division multiplexed optical signal output from the delay fiber by connecting an output from the delay fiber to an output line corresponding to a switch control signal for a time during which the switch control signal is in an ON state;
• an optical monitor configured to measure an optical packet length of the wavelength division multiplexed optical signal in which optical signals of the plurality of wavelengths are kept in a multiplexed state, on the basis of a power level of the wavelength division multiplexed optical signal output from the delay fiber;
• and
• a switch control signal generator configured to generate the switch ON/OFF signal that is in an ON state during a time corresponding to the optical packet length measured by the optical monitor for the wavelength division multiplexed optical signal including routing information determined in accordance with the wavelength division multiplexed optical signal and that makes the optical switch connect an input line corresponding to the routing information to an output line corresponding to the routing information.