Practice Problems_sources
... (b) If one end of the lasers is coated with a dielectric reflector so that its reflectivity is now 90%, what is the optical gain at the lasing threshold? (Ans: 22.44 cm-1 . Notice that required gain to overcome the loss can be reduced by coating on one side of the cavity and take the useful output o ...
... (b) If one end of the lasers is coated with a dielectric reflector so that its reflectivity is now 90%, what is the optical gain at the lasing threshold? (Ans: 22.44 cm-1 . Notice that required gain to overcome the loss can be reduced by coating on one side of the cavity and take the useful output o ...
Basic amplifier concepts
... • AC coupled amplifiers will always have zero gain at dc voltage. Examples include audio amplifiers and ECG amplifiers, where application of dc signal is undesirable. • A DC-coupled amplifier will have a constant gain down to very low frequencies and also dc. Example include amplifiers for video sig ...
... • AC coupled amplifiers will always have zero gain at dc voltage. Examples include audio amplifiers and ECG amplifiers, where application of dc signal is undesirable. • A DC-coupled amplifier will have a constant gain down to very low frequencies and also dc. Example include amplifiers for video sig ...
Titel
... After traveling ~100 km, signals are attenuated by ~20dB Signals need to be amplified or signal-to-nose (SNR) of detected signals is too low and bit error rate (BER) becomes too high (typically want BER <10-9) ...
... After traveling ~100 km, signals are attenuated by ~20dB Signals need to be amplified or signal-to-nose (SNR) of detected signals is too low and bit error rate (BER) becomes too high (typically want BER <10-9) ...
chapter 6 optical amplifiers
... semiconductor lasers. They consist of a gain (active) section and a passive section constructed of a semiconductor material such as indium phosphide. The main difference is that SOAs are made with layers of antireflection coatings to prevent light from reflecting back into the circuit. Optical gain ...
... semiconductor lasers. They consist of a gain (active) section and a passive section constructed of a semiconductor material such as indium phosphide. The main difference is that SOAs are made with layers of antireflection coatings to prevent light from reflecting back into the circuit. Optical gain ...
Steady State Simulation of Semiconductor Optical Amplifier
... • The Fabry Perot SOA (FP-SOA) where reflections from the end facets are significant (i.e. the signal undergoes many passes through the amplifier). • The travelling-wave SOA (TW-SOA) where reflections are negligible (i.e. the signal undergoes a single-pass of the amplifier). Antireflection coatings ...
... • The Fabry Perot SOA (FP-SOA) where reflections from the end facets are significant (i.e. the signal undergoes many passes through the amplifier). • The travelling-wave SOA (TW-SOA) where reflections are negligible (i.e. the signal undergoes a single-pass of the amplifier). Antireflection coatings ...
EE 230: Optical Fiber Communication Lecture 7
... •Causes undesired coupling of light between channels •Can however also be used to advantage in wavelength converters. High coupling loss Polarization sensitive gain ...
... •Causes undesired coupling of light between channels •Can however also be used to advantage in wavelength converters. High coupling loss Polarization sensitive gain ...
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.