本偏压控制器适用于MZ型的铌酸锂IQ调制器, 通过3路电压分别控制调制器的3对MZ干涉臂, 支持的调制格式包括QPSK, QAM, CS-SSB等.此款偏压控制器应用于QPSK/QAM的相干光通信系统.
An IQ modulator consists of three different modulators: I, Q arms are intensity modulators, P arm is a phase modulator. The IQ modulator is typically applied to coherent transmission systems. Plugtech Precision Systems’ modulator bias controller is specially designed for IQ modulators to ensure a stable operation state 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 bias voltage and the related error. A compensate bias voltage will be applied afterwards according to the previous measurements. In this way, the 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
_ Provides three biases for IQ modulators
_ Modulation format independent: QPSK, QAM, OFDM, SSB 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) _ 28mm(D) _ 8mm(H)
_ High stability: fully digital implementation
_ Easy to use: Manual operation with mini jumper; Flexible OEM operations through UART2
_ Two modes to provide bias voltages: a.Automatic Bias Control; b.User defined bias voltage
Application
_ LiNbO3 and other IQ modulators
_ QPSK, QAM, OFDM, SSB and etc
_ Coherent Transmission
