WDM OPTICAL COMMUNICATION SYSTEM USING CO-PROPAGATING RAMAN AMPLIFICATION

摘要

The use of a co-propagating fiber Raman amplifier in an optical WDM transmission system has been found to be practical in the situation where th e fiber amplifier is operated into depletion and the characteristics of the input signals are controlled to exhibit a reduced integrated relative intensity noise (RIN) ov er the fiber crosstalk bandwidth. In particular, the reduction in the integrated RIN can be achieved by increasing the number of input channels (by adding more messages or simpl y using dummy channels), encoding the data in a particular fashion to reduce the integrated RIN, or decorrelating the plurality of N input signals below a predetermined , relatively low frequency (for example, 2MHz).