Optical Communication Practice Test 1

1. Raman and Brillouin scattering are usually observed at ___________

2. The ratio of speed of light in air to the speed of light in another medium is called as _________

3. The phenomenon which occurs when an incident wave strikes an interface at an angle greater than the critical angle with respect to the normal to the surface is called as ____________

4. A single-mode optical fiber has an attenuation of 0.3dB/km when operating at wavelength of 1.1μm. The fiber core diameter is 4μm and bandwidth is 500 MHz. Find threshold optical power for stimulated Brillouin scattering.

5. A decibel may be defined as the ratio of input and output optical power for a particular optical wavelength.

6. The maximum bit rate that may be obtained on an optical fiber link is 1/3Γ.

7. For no overlapping of light pulses down on an optical fiber link, the digital bit rate BT must be ___________

8. The optical source used in a fiber is an injection laser with a relative spectral width σ_λ/λ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.

9. Which is the unit of measurement of attenuation in optical fibers?

10. A multimode step index fiber has source of RMS spectral width of 60nm and dispersion parameter for fiber is 150psnm^-1km^-1. Estimate rms pulse broadening due to material dispersion.