| 摘要 |
<p>A set of modules for use in constructing an optical network, the set comprising at least two different types of module, wherein the different module types comprise: (a) a multi-wavelength distribution module comprising: at least one optical output port; at least two wavelength generators each capable of generating an optical signal comprising at least N different wavelengths, where N is an integer greater than 1; and a protection switching mechanism arranged to selectively connect only one of said wavelength generators at anyone time to said at least one optical output port; and (b) an optical modem module comprising: N electrical input ports;N electrical output ports;an optical input port for receiving modulated optical signals;an optical output port for outputting modulated optical signals;a further optical input for receiving an optical output signal comprising N different wavelengths from a multi-wavelength distribution module;a modulator arranged to receive up to N electrical input signals from the N electrical input ports and an optical output signal comprising N different wavelengths from the further optical input, and modulate up to N of the different wavelengths in dependence upon a respective one of the electrical signals to generate an output modulated optical signal comprising up to N channels for output at said optical output port; and a demodulator coupled to the optical input port for demodulating an optical signal comprising up to N channels into a set of N electrical signals, each electrical signal corresponding to one of the N channels, the modulator being coupled to the N electrical output ports for supplying a respective one of the signals to each port.</p> |
