A DP-IQ modulator consists of two IQ modulators and a polarization rotator. Each IQ modulator consists of three different modulators: I, Q arms are intensity modulators, P arm is a phase modulator.
The DP-IQ modulator is typically applied to DPQPSK systems. Plugtech Precision Systems’ modulator bias controller is specially designed for DPIQ modulators to ensure stable operations in various operating environments. Based on its fully digitized signal processing method, the controller can provide ultra stable performance.
The controller injects a low frequency, low amplitude dither signal together with a bias voltage into the modulator. It keeps reading the output from the modulator and determines the condition of the modulator and the related error. A compensate bias voltage will be applied afterwards according to the previous measurements. In this way, the DP-IQ modulator is ensured to work under a proper bias voltage.
The controller is very compact in volume, and is suitable for modern communication systems.
Feature
_ Simultaneously provides six automatic bias voltages for Dual Polarization IQ modulators
_ Modulation format independent: SSB, QPSK, QAM, OFDM verified.
_ Plug and Play: No manual calibration needed; Everything automatic
_ I, Q arms: controll on Peak and Null modes High extinction ratio:50dB max1
_ P arm: controll on Q+ and Q- modes; Accuracy: ± 2°
_ Low profile: 40mm(W) _ 29mm(D) _ 8mm(H)
_ High stability: fully digital implementation
_ Easy to use: Manual operation with mini jumper; Flexible OEM operations through UART2 /IO
_ Two modes to provide bias voltages: a.Automatic Bias Control; b.User defined bias voltage
Application
_ LiNbO3 and other DP-IQ modulators
_ Coherent Transmission
