Using Laser Diode Driver IC (ADN2871) for different polarity  laser

Hi,

I want to use an AD laser driver IC to control AC and DC current applied to the laser diode (VCSEL). All ICs I found are designed to control the cathode current of the laser diode.

The problem now is that I am working with an array of laser diodes, which has the cathodes of all the diodes wired to one pin, only the lasers anodes are individually addressable. I need to be able to control AC and DC currents for each individual laser!

Is there a way I can use, for example the ADN2871, to control the anode current of the laser by  inverting the ouput current - or something similar?

Thanks and kind regards,

Daniel

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  • Hi, Daniel:

     
    To drive a “common cathode” laser array, you need either laser current sources or voltage drivers.
    All of our ADI direct modulated laser diode drivers are laser current drivers.
    ADN2871 and ADN2847 mentioned here are laser current sinks by their designs. So, without helps of external companion circuitry, they are not direct candidates to your target applications.
    ADN8810 is an open loop, laser bias current source driver. It can provide precisely bias current source control to each VCSEL of your laser array. You can implement one external average power control loop by using software to adjust or control the ADN8810 input.
    ADN2830 can be configured as a laser bias current source with the help of the external circuitry. ADN2830 provides one on-chip average power control loop to adjust the required laser bias current per preset optical average power level.
    To add the modulation current to each VCSEL of your laser array, you need to AC couple the modulation current to each VCSEL. What is the target modulation date rate?

    If you have further questions of how to use ADI laser diode drivers in your application, welcome to contact our central applications team at linear.apps@analog.com. Thanks for being interested in our ADN2871.

    Best Regards,

    Dongfeng

Reply
  • Hi, Daniel:

     
    To drive a “common cathode” laser array, you need either laser current sources or voltage drivers.
    All of our ADI direct modulated laser diode drivers are laser current drivers.
    ADN2871 and ADN2847 mentioned here are laser current sinks by their designs. So, without helps of external companion circuitry, they are not direct candidates to your target applications.
    ADN8810 is an open loop, laser bias current source driver. It can provide precisely bias current source control to each VCSEL of your laser array. You can implement one external average power control loop by using software to adjust or control the ADN8810 input.
    ADN2830 can be configured as a laser bias current source with the help of the external circuitry. ADN2830 provides one on-chip average power control loop to adjust the required laser bias current per preset optical average power level.
    To add the modulation current to each VCSEL of your laser array, you need to AC couple the modulation current to each VCSEL. What is the target modulation date rate?

    If you have further questions of how to use ADI laser diode drivers in your application, welcome to contact our central applications team at linear.apps@analog.com. Thanks for being interested in our ADN2871.

    Best Regards,

    Dongfeng

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