IQABC – Automatic Bias Controller

World Leading Automatic Bias Controller for IQ-Modulators

Coherent Solutions’ IQABC with its advanced ABC (Automatic Bias Control) algorithm, accurately and reliably controls and optimizes all the modulator bias points regardless of the modulation format or pattern. Now you just need to hit the AUTO button and focus on your research without worrying if your modulator is biased correctly.

Optimizing DC bias points of an IQ modulator is no trivial task. There are six different Mach-Zehnder structures inside one dual polarization IQ modulator, all simultaneously influencing the properties of a single optical signal. Trying to optimize bias points using just the intensity measurement of the optical signal is time consuming, inaccurate and it requires a lot of knowledge and experience.

With its robust and adaptive ABC algorithm, the IQABC will find optimal bias points and maintain optimization against any bias drifts or changes to the driving signal.

'We are delighted to have the IQABC -bias control module in our laboratory. It saves us a lot of time and effort in setting up our experiments. Its robustness to baud rates and modulation formats is remarkable. The device also comes with a well-designed GUI which adds to the convenience. We are also very pleased with the technical support from Coherent Solutions which not only includes timely replies to our queries and concerns but also regular inquiries from their side to keep our needs satisfied. Overall, we are very pleased with everything Coherent Solutions has offered us.'
Stephen E. Ralph
Georgia Institute of Technology


autoModulation format independent ABC algorithm

The robust ABC algorithm works with any modulation formats for a truly automated operation.

biasIndependent control of all DC biases

Each of I, Q or Phase DC biases can be controlled independently in either automatic or manual mode.

repeatabilityAccurate & stable tracking of bias drifts

Our advanced ABC algorithm constantly tracks any drift, so you get stable and repeatable results every time.

oifCompatible with OIF standard IQ modulators

The external modulation adaptor board provides simple and quick connectivity to any IQ Modulator with OIF compatibility.

connectivitySuperior connectivity

Control the IQABC locally or remotely via USB or Ethernet. With SCPI compatibility the choice is yours.

installEasy to use software

IQABC software controller provides access to all the functions in a clean, simple and intuitive graphical interface.

3yrwarranty_60x60Product warranty

This product comes with a 3 year warranty.

Convenient and simple to operate

Simply connect your OIF compliant IQ modulator to an IQABC modulator adaptor board and feed the modulator’s optical output to IQABC, then you are ready to go! IQABC starts to optimize the biases automatically upon start-up.
IQABC Automatic Bias Controller & IQModulator Diagram

Intuitive Graphical User Interface (GUI)

IQABC can be operated in stand-alone mode using its built-in front panel control and display. It also comes with a feature complete control software, IQSignalManager, which is an intuitive and easy-to-use GUI. With IQABC’s Ethernet connectivity, you can access and control the unit from anywhere within your local access network and even automate the control using SCPI commands.

Download Spec Sheet

For more information, please download the IQABC Spec Sheet which includes full technical specifications.

IQABC Spec Sheet


If you would like to find out more about this product, please contact us.


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