Variable-rate communication system with optimal filtering

Abstract

A variable-bit-rate communication system is described. The communication system includes a variable-bit-rate transmitter that generates digital data at a first or a second bit rate and a variable-bit-rate receiver that receives the digital data. The digital data comprises a sequence of signaling waveforms having a first or a second duty cycle, respectively, wherein each signaling waveform has the same shape.

1 - 30 . (canceled)  
     
     
         31 . An optical filter that generates double pass Fabry-Perot transmission characteristics, the filter comprising: 
 a) a single-polarization fiber isolator that generates a polarized optical signal beam having a single polarization;    b) a polarization beam splitter in optical communication with the polarization fiber isolator, the polarization beam splitter passing the polarized optical signal beam through one port;    c) a Fabry-Perot filter in optical communication with the polarized optical signal beam; and    d) a Faraday mirror in optical communication with the Fabry-Perot filter, the Faraday mirror modifying the polarization of the signal beam and reflecting the signal beam back to the Fabry-Perot filter and the polarization beam splitter, wherein the beam splitter directs the signal beam having the modified polarization through a second port, thereby generating the double pass Fabry-Perot transfer function.    
     
     
         32 . (canceled)