Optical Molasses
... First demonstrated in 1985 by S. Chu Laser cooling first became popular in 1970’s This led to the idea of the Doppler limit ...
... First demonstrated in 1985 by S. Chu Laser cooling first became popular in 1970’s This led to the idea of the Doppler limit ...
SignalsInstr
... physical characteristics of the instruments used for measurement. Part of your job is to separate the physics part of the signal from the instrumentation part. The problem: Let’s look at this in the context of an optical measurement. Suppose you send light from a source, through a monochromator (onl ...
... physical characteristics of the instruments used for measurement. Part of your job is to separate the physics part of the signal from the instrumentation part. The problem: Let’s look at this in the context of an optical measurement. Suppose you send light from a source, through a monochromator (onl ...
Approximate Theory of Rectangular Optical Waveguides
... LED (right) are very different. The latter has a strongly-modified emission pattern due to the scattering of waveguided modes out of the LED chip. ...
... LED (right) are very different. The latter has a strongly-modified emission pattern due to the scattering of waveguided modes out of the LED chip. ...
5150119
... Fig. 1 illustrates the mixing mechanism for two amplitudemodulated optical carriers that are being simultaneously coupled into a SOA. One of the carriers is generated by a transmitter laser (TO) and is modulated at a frequency fTO. The other is produced by a local oscillator laser (LO) and modulated ...
... Fig. 1 illustrates the mixing mechanism for two amplitudemodulated optical carriers that are being simultaneously coupled into a SOA. One of the carriers is generated by a transmitter laser (TO) and is modulated at a frequency fTO. The other is produced by a local oscillator laser (LO) and modulated ...
Fiber Optic
... (ILD).The light-beam pulses are then fed into a fiber-optic cable where they are transmitted over long distances. ...
... (ILD).The light-beam pulses are then fed into a fiber-optic cable where they are transmitted over long distances. ...
a) Given the transfer function of a detector (below), label and
... Please use your drawing to illustrate how PMT and APD work and compare the mechanisms which enable them to achieve signal amplification. Also, explain why is it hard to make a detector that has high detectivity while also preserves a high detection speed? ...
... Please use your drawing to illustrate how PMT and APD work and compare the mechanisms which enable them to achieve signal amplification. Also, explain why is it hard to make a detector that has high detectivity while also preserves a high detection speed? ...
Principles of light guidance
... 64,000 bits/sec. Quality does not suffer by discrete sampling if it is fast enough. This is analogous to projecting 25 discrete movie frames per second, which fools the eye into seeing a continuous picture sequence. ...
... 64,000 bits/sec. Quality does not suffer by discrete sampling if it is fast enough. This is analogous to projecting 25 discrete movie frames per second, which fools the eye into seeing a continuous picture sequence. ...
Unit 1.7 Optical networking and processing
... Two fibres in each direction, one working, one backup or protection. In the event of a Cable fault signal is routed over an alternative fibre path ...
... Two fibres in each direction, one working, one backup or protection. In the event of a Cable fault signal is routed over an alternative fibre path ...
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.