The ECL technology is versatile and powerful, as demonstrated by the features that Pure Photonics has made available thus-far. We are however listening to our customers and make new capabilities available on-demand and if-needed provide custom features to our customer-base, often without additional charge (as it allows us to expand our application range).
We present below three cases where we have supported our customers' specific needs.
PROBLEM: In some cases, the customer does not want to tune the laser once it is embedded in a system. They want the laser to come on at a pre-determined frequency and power, once the required voltages are applied. Such an approach saves them from implementing an LVTTL interface with a micro-processor and the associated control overhead.
SOLUTION: We implemented a firmware version that bypasses the standard command-driven activation and instead directly goes into the power-up sequence upon activation. The laser comes up at a preset frequency and power, which the customer can set and save to the module in their own lab or manufacturing facility, before embedding the unit in a system. This approach preserves the logistical benefits of tunability, while making the application simpler and more cost-effective.
Frequency response to analog input
PROBLEM: the customer was using a feeback loop to control the frequency of the laser. However, typically the communication with the ITLA is digital. To not have to make a analog-to-digital transition,
SOLUTION: We implemented the Clean Measurement capability tied to the FTF frequency control of the laser. The customer applies a 0 - 10V signal to the input of the ITLA and this is detected by the micro-processor. The 0V signal corresponds to the maximum negative FTF offset, 5V corresponds to 0GHz offset and 10V corresponsds to the maximum positive offset. The customer can actually set the maximum offset, so that he can trade-off between resolution and range.