The title is actually one of the many questions I have. I've started to work on a project that includes lasers. I've worked with lasers and fiber optics before and I even constructed a simple constant current driver and used it in a fiber ring laser system. So I am not that unfamiliar with the concepts. However, all these were quite basic. Okay now let me ask my questions.
1) I've been told that I need a current modulated laser driver to use one of my 1550nm laser diodes. (LUCENT D2570)
Here's the link of the product. What is this current modulation? What does it do? What does that 5MHz mean? What is its effect? Does it make the CW laser pulsed? Because my advisor said it had to be 5MHz to obtain 200ns pulses. If it does make the laser pulsed, how does that happen?
2) I also have a 1310nm pulsed laser diode.(NEC NDL7503P1) It is a coaxial laser with 4 pins. When I first started working on this project it was activated with a DC source which was simply connected to laser anode and cathode with alligators. I was also told that I need the same driver given in the link above. The question is, how does this diode work with that simple connection? Does the DC source act as a constant current supplly? Since it says the laser is pulsed, does it generate pulses with this connection or does it mean that it can generate pulses when with a suitable driver? If so, what kind of driver is that? Is it the one in the link? How do you make it pulsed? Is it CW now without the driver?
I know some of these questions are silly or requires very basic knowledge but the guy working on electronics left. Therefore, I now have to work on both optical part and electronic part. I know don't know much about this topic but before coming here believe me I tried everything to learn these.
Thank you for your precious answers.