IJFTR 12(2) 100-102
... calculated values of n~'for the three polymeric fibres are more in agreement with those obtained by interferometric and the Becke-line methods" - 10 by Wilkes formula than with those by Presby formulas. In the case of an unpolarized beam, n~'is the only measurable value. The results cannot be interp ...
... calculated values of n~'for the three polymeric fibres are more in agreement with those obtained by interferometric and the Becke-line methods" - 10 by Wilkes formula than with those by Presby formulas. In the case of an unpolarized beam, n~'is the only measurable value. The results cannot be interp ...
P1X
... metastable (ie. the time for transition is much longer than the time for transition to other states). • If we can optically pump a three level system such that electrons are stimulated from the bottom E1 level to the top level E3, and these decay to a metastable intermediate state E2 then we obtain ...
... metastable (ie. the time for transition is much longer than the time for transition to other states). • If we can optically pump a three level system such that electrons are stimulated from the bottom E1 level to the top level E3, and these decay to a metastable intermediate state E2 then we obtain ...
Laser III - Universiti Sains Malaysia
... indicated by an abrupt increase in radiance of the emitting region, leading to marked decrease in spectral width. ...
... indicated by an abrupt increase in radiance of the emitting region, leading to marked decrease in spectral width. ...
Chapter 4 Photonic Sources
... intensity of the optical radiation in that mode. In this case, the loss and gain of the optical field in the optical path determine the lasing condition. The radiation intensity of a photon at energy h varies exponentially with a distance z amplified by factor g, and attenuated by factor accordin ...
... intensity of the optical radiation in that mode. In this case, the loss and gain of the optical field in the optical path determine the lasing condition. The radiation intensity of a photon at energy h varies exponentially with a distance z amplified by factor g, and attenuated by factor accordin ...
optical fibre communication
... • Refractive index of silica is frequency dependent. Thus different frequency (wavelength) components travel at different speed M is the material dispersion parameter. It characterizes the amount of pulse broadening by material dispersion per unit length of fibre and per unit of spectral width. ...
... • Refractive index of silica is frequency dependent. Thus different frequency (wavelength) components travel at different speed M is the material dispersion parameter. It characterizes the amount of pulse broadening by material dispersion per unit length of fibre and per unit of spectral width. ...
Heterogenously integrated InP on Si microdisk lasers
... We review recent theoretical and experimental work on InP membrane microdisk lasers heterogeneously integrated on SOI and coupled to a Si bus waveguide. After a general introduction on the fabrication and the operation principles, we will describe various improvements in the fabrication technology. ...
... We review recent theoretical and experimental work on InP membrane microdisk lasers heterogeneously integrated on SOI and coupled to a Si bus waveguide. After a general introduction on the fabrication and the operation principles, we will describe various improvements in the fabrication technology. ...
FibreOpticCommSys
... Where P is the received optical power, ρ is the detector’s un-amplified responsivity, M is the detector gain if an APD is used, n (usually between 2 and 3) accounts for the excess noise of the APD, B is the receiver’s bandwidth, k is the Boltzmann constant (k= 1.381023 J/K), e is the magnitude of t ...
... Where P is the received optical power, ρ is the detector’s un-amplified responsivity, M is the detector gain if an APD is used, n (usually between 2 and 3) accounts for the excess noise of the APD, B is the receiver’s bandwidth, k is the Boltzmann constant (k= 1.381023 J/K), e is the magnitude of t ...
Lecture_Interferometer
... 1. FP increases stored power in the arm 2. FP increases accumulation time of the signal => Above the roll-off, increasing F does not improve the response ...
... 1. FP increases stored power in the arm 2. FP increases accumulation time of the signal => Above the roll-off, increasing F does not improve the response ...
Optical amplifier
An optical amplifier is a device that amplifies an optical signal directly, without the need to first convert it to an electrical signal. An optical amplifier may be thought of as a laser without an optical cavity, or one in which feedback from the cavity is suppressed. Optical amplifiers are important in optical communication and laser physics.There are several different physical mechanisms that can be used to amplify a light signal, which correspond to the major types of optical amplifiers. In doped fibre amplifiers and bulk lasers, stimulated emission in the amplifier's gain medium causes amplification of incoming light. In semiconductor optical amplifiers (SOAs), electron-hole recombination occurs. In Raman amplifiers, Raman scattering of incoming light with phonons in the lattice of the gain medium produces photons coherent with the incoming photons. Parametric amplifiers use parametric amplification.