Using the CAB8 and CAB12 without an interposer

Though our interposers offer a wide variety of connectivity options, you may want to just plug the bulky CAB8 or CAB12 directly into your application. We use high-density D-sub connectors from the AMP-TE AMPLIMITE 0.50 Series, which can be purchased from any of the large online distributors (e.g. Farnell, Digikey, Mouser). Part numbers for right-angle and vertical connectors are listed in the table below.

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How to connect to your chip

This question comes up often. In this post, we outline some of the different approaches and discuss the interposers which we stock for various scenarios. If none of our existing interposers meet your needs, please contact us with your special product request.

We stock a variety of interposer PCBs. These take in the bulky 60 or 68-way cables from our line of docks and break them out into smaller connectors for wiring your devices. Most interposers present two or more identical output connectors. Some contain integrated patch panels, to allow manual re-wiring of the device. Others are directly wired, and rely on reconfiguration in software.

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Which driver is right for you?

Choosing a driver for your photonic device can be a difficult task. Though we hope that our drivers are the best fit, there are several parameters to keep in mind.

  • How much current does each input of my device require?
  • How much voltage is required to achieve this current?
  • What is the resistance of my on-chip heaters?
  • What precision do I need?
  • Does my device care about the direction of current flow?
  • How many inputs does my device have that need to be driven?

Avoiding common-ground electrical cross-talk

Complex photonic devices require many electrical connections. A quick way to save a lot of connections is to use a common ground wire for several electro-optic devices (e.g. heaters, or photodiodes). For N devices, this saves N – 1 connections, which can translate to significant reductions in wire-bonding or multi-point probe size, and ultimately to savings in time and money.

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How to use a push-type output

Push-type outputThe push-type, class-B, or open-emitter, amplifier output stage offers two main benefits: it can output 0 V when powered from a single supply, and it can drive very large currents. This stage features in our Q8 driver,  which uses MOSFET output elements. The basic structure of a push-type output stage is shown. Continue reading How to use a push-type output