Thursday, September 17, 2009

NeoPhotonics Ships Coherent Mixers For 40 and 100 Gbps Receivers

NeoPhotonics announced the general availability and volume shipment of its "photonic integrated circuit" (PIC) based Coherent Mixer for 40 and 100 Gbps optical transmission systems. Coherent mixers enable ultra high-rate optical transmission by revealing additional information about the amplitude and phase of the received optical signal over traditional intensity-level receivers, allowing transmission of multiple bits in each optical data pulse. Specifically, the Coherent Mixer product provides advanced demodulation to analyze the state-of-polarization and optical phase of a phase-modulated signal relative to an externally supplied optical reference, enabling recovery of the phase-polarization constellation for Dual Polarization Quadrature Phase Shift Keyed (DP-QPSK) data transmission. The NeoPhotonics Coherent Mixer requires no power, operates across the C or L band and is based on planar integration, utilizing high volume semiconductor production methodologies.

At the same time, NeoPhotonics announced the initial availability of its demodulator for Differential Quadrature Phase Shift Key (DQPSK) data transmission. NeoPhotonics' DQPSK demodulator consists of two PIC integrated Delay Line Interferometers (DLIs), providing in-phase and quadrature analysis of differentially phase-encoded signals. To accommodate the unpredictable and varying nature of the received signal polarization, NeoPhotonics' DQPSK demodulator has been optimized such that the performance exhibits extremely low sensitivity to polarization variations.