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.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
• Suitable for both RZ and NRZ modulation format
• Telcordia GR-1221 qualified

Applications

• 5 or 20 Gb/s DQPSK Signal Reception
• Data Rate Optimization
• Extend Transmission Distances

For more information on DQPSK Demodulator talk to BBN International Ltd