The rare-earth-doped fiber lasers have spectral line-width in the range of _________________

Related MCQs

• The optical source used in a fiber is an injection laser with a relative spectral width σλ/λ of 0.0011 at a wavelength of 0.70μm. Estimate the RMS spectral width.
• 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.
• For particular materials with smaller bandgap energies operating in _____________ wavelength, the linewidth tends to ______________
• If the input power 100μW is launched into 6 km of fiber, the mean optical power at the fiber output is 2μW. What is the overall signal attenuation through the fiber assuming there are no connectors or splices?
• . When the input and output power in an optical fiber is 120μW & 3μW respectively and the length of the fiber is 8 km. What is the signal attenuation per km for the fiber?
• In a GaAs LED, compute the loss relative to internally generated optical power in the fiber when there is small air gap between LED and fiber core. (Fiber coupled = 5.5 * 10-4Pint)
• QD lasers have a very low threshold current densities of range
•  ____________________ lasers are presently the major laser source for optical fiber communications
• Which of the following co-dopant is not employed by neodymium and erbium doped silica fiber lasers?
• Dopants levels in glass fiber lasers are generally ___________