2x8 QPSK Mixer

To be used for optical coherent detection such as DP-QPSK receivers, Optoplex’s ten-port 2x8 Coherent Mixer (aka QPSK mixer) combines the incoming signal with a local oscillator to generate eight light states in the complex-field space. The eight light output signals can then be coupled into four pairs of balanced detectors. The block diagram below shows the application of a 2x8 coherent mixer in a DP-QPSK receiver. Since the mixing process is data rate independent, the devices can be used for any data rate in applications such as 40Gb/s or 100Gb/s transmission systems.

Key Features

• Purely passive (no temperature control)
• Compact size
• Low insertion loss
• Low phase error
• <1 ps skew
• Colorless (wavelength independent)
• Data-rate independent

Primary Applications

• Optical coherent detection

DP-QPSK demodulation

Transmission at 100Gb/s (preferred choice of modulation format)