Crack the Code: Understanding Electro Optic with Expert Answers

[onqun]

Hello guys I am taking electro optic this semester. . I had a quiz last friday. I could not do couple of questions.

1.The reason of the 1550 nm fiberoptic systems are more populer than 1300nm is, 1550 has less attenuation?

2.What is the aprroximate value of the loss of present day fiber optic systems in terms of db/km at 850nm and 1550nm?

3. why can we not measure the phase difference between two light beams electronically.

4. I have fiber optic sensor which is extremely high sensitive. What kind of light source should I use and why?

interferometric sensor, and I said Laser source but i don't know why


Well thanks a lot if you help me to solve these questions.

 

[jbsteele]

1. Yes, 1550 nm fiberoptic systems are generally more popular than 1300nm because the 1550nm has less attenuation which results in greater transmission efficiency. 2. The approximate loss of present day fiber optic systems at 850nm is about 0.4 dB/km, and at 1550nm it is about 0.2 dB/km.3. We cannot measure the phase difference between two light beams electronically because the phase of a light beam is a continuous value, whereas electronic signals are discrete.4. You should use a laser source for your fiber optic sensor because lasers provide a highly concentrated and coherent light source which is ideal for interferometric sensors. Laser light is also very stable, so it can be used to measure small changes with high accuracy.