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DQPSK Demodulator

 Differential Quaternary Phase-Shift Keying (DQPSK) is the four-level version of DPSK. DQPSK transmits two bits for every symbol (bit combinations being 00, 01, 11 and 10) and has an additional advantage over conventional binary DPSK. DQPSK has a narrower optical spectrum, which tolerates more dispersion (both chromatic and polarization-mode), allows for stronger optical filtering, and enables closer channel spacing. As a result, DQPSK is the only modulation format which allows processing of 40Gb/s data-rate in a 50-GHz channel spacing system.

Key Features
  • Athermal design
  • C+L band coverage by a single device
  • Low temperature-dependent frequency shift (TDFS)
  • Low polarization-dependent frequency shift (PDFS)
  • Wide bandwidth
  • Low insertion loss & PDL
  • High power handling
  • Passive, semi-tunable and fully tunable operation <
DQPSK Demodulator
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  • Suitable for both RZ and NRZ modulation format
  • Telcordia GR-1221 qualified
    • Primary Applications
    • 5 or 20 Gb/s DQPSK Signal Reception
    • Data Rate Optimization
    • Extend Transmission Distances


    Visit the BBN International Ltd website for more information on DQPSK Demodulator

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