All Questions
6
questions
-1
votes
2
answers
518
views
Why did cars switch from infrared key fobs to radio-wave key fobs? [closed]
Is an RFID key fob less likely to have its signal blocked? Or is it longer range? Or can it be made smaller, or cheaper?
Also, how do infrared devices generate an infrared signal? With an infrared-...
- 231
-1
votes
1
answer
148
views
Task of the Driver on Mach Zehnder Modulator [closed]
What is the task of the Driver of the MZM modulator? I'm trying to get RF input for the MZM, does the driver convert optical input to RF?
We have a driver, what's the purpose of it? How can I design ...
6
votes
1
answer
4k
views
Accurately measure relative intensity noise (RIN) using RF spectral analyzer?
I'm trying to measure the relative intensity noise (RIN) of a laser using an RF spectrum analyser. It's a fairly common method (outline: How to measure relative intensity noise in lasers) although I ...
- 163
6
votes
4
answers
11k
views
Driving an LED/Laser diode with a RF signal up to 20 MHz
I'm trying to design a circuit that will let me drive an LED or Diode laser with a RF signal up to ~20 MHz or so. Since the optical device will need to be biased with a DC current, a bias -t is a ...
- 1,132
4
votes
5
answers
3k
views
How to terminate 50 ohm transmission line without drawing DC
I am sending a 10 MB/sec digital data stream by amplitude moduating a infrared quantum cascade laser. The laser requires a hefty bias of about half an amp (which drops about 8.5 volts across the laser)...
- 385
6
votes
1
answer
7k
views
I need to design a Bias-T circuit for a diode laser - help choosing component values
I need to modulate a diode laser with a RF source. I've found parts on Minicircuits that can do this, but I'd like to have the Bias-T and amp on my own PCB. So, I need to design a bias-T circuit that ...
- 1,132