NeoPhotonics proclaimed that it has begun the mass production of its PIC-based compact Differential Quaternary Phase Shift Key (DQPSK) demodulator developed for use in 40Gbps direct detection fiber optic transport systems.
DQPSK Demodulator
The small form factor DQPSK demodulator occupies less board space in superior capacity systems as it has a size below one-half of that of the standard form factor DQPSK demodulator. The DQPSK systems use delay-line interferometers (DLIs) for mixing a delayed sample with the input signal, eliminating the requirement of local exterior optical reference laser and the associated expenditures.
NeoPhotonics’ DQPSK demodulator incorporates two DLIs on one photonic chip and offers the phase-encoded signal’s quadrature and in-phase analysis. It is engineered to demonstrate less sensitivity to variations in polarization in order to tackle the unstable nature of the incoming signals. NeoPhotonics released the small form factor edition in the last quarter of 2010.
NeoPhotonics also produces a PIC-based Intradyne Coherent Receivers (ICR), PIC-based standard form factor DQPSK demodulator for use in 40Gbps transmission systems and 90° hybrid coherent mixers for both 100 and 40 Gbps coherent transmission systems.
According to the Chairman and Chief Executive Officer at NeoPhotonics, Tim Jenks, the 100 and 40 Gbps transmission technologies installations demand superior optical performance from the parts utilized. The company’s photonic integration technology provides the superior quality and optical performance that are vital for those ultra speed solutions, he added.