| 摘要 |
PURPOSE:To stably receive each channel even for a multichannel optical frequency multiplex signal by making a receiving part recognize an optical frequency multiplex signal group each local oscillation light source is due to receive according to a group identification signal. CONSTITUTION:The group identification signal 50, 60, 70 for recognizing each receiving channel group 1 to 3 is sent from a transmitting side, and this signal 50, 60, 70 is laid on, for instance, the channel of the lowest optical frequency of the group 1 to 3. First of all, each local oscillation light source 201 to 203 recognizes the group identification signal of the signal channel group it is due to take charge of, and by counting the channels to a high frequency side from this channel by the number of the channels it is due to take charge of, it can correctly recognize the signal channel group it is due to take charge of. The light source 201 to 203 outputs local oscillation light only when the reception request signal of the channel it is due to take charge of arrives. Thus, each channel can be received in a stable state. |
