| 摘要 |
In the present ultra-highspeed packet transfer ring network, an add/drop multiplex type node apparatus adds an optical packet to the optical fiber transmission path by preparing a label signal containing information on an address of a destination node apparatus or a routing to the destination node apparatus, and outputs time-sequenced signals to the optical fiber transmission path by multiplexing the optical packet and the label signal by means of wavelength or polarization multiplexing. The add/drop multiplex type node apparatus also receives a label signal by separating and extracting the label signal from the optical fiber transmission path, and determines whether to drop an optical packet corresponding to the label signal to its own node apparatus or to pass the optical packet through with reference to an address or routing information contained in the label signal, and operates an optical switch accordingly. Also, in this ultra-highspeed packet transfer ring network, each node constantly monitors label signals so as to detect any fault developing in the transmission path and to divert the optical packets around the fault. Also, the ultra-highspeed packet transfer ring network enables optical packet compression using a simple circuit by modulating the optical pulses separated by an optical divider with respective data, and multiplexing the modulated pulses again. Also, highspeed optical packet decompression is achieved using a simple circuitry by converting the input optical packets in an OTDM/WDM conversion circuit to different wavelengths and inputting these waves in a wavelength-dependent delay circuit. <IMAGE> |
