What is gain saturation in semiconductor optical amplifier?
Gain saturation in semiconductor lasers leads to refractive index changes that can be exploited in devices that exhibit hysteresis as well as amplification of the incoming signal.
How does an optical amplifier work?
An optical amplifier is a device which receives some input signal and generates an output signal with higher optical power. Typically, inputs and outputs are laser beams, either propagating as Gaussian beams in free space or in a fiber.
What is amplifier gain in optical fiber?
Doped fiber amplifiers (DFAs) are optical amplifiers that use a doped optical fiber as a gain medium to amplify an optical signal. They are related to fiber lasers. The signal to be amplified and a pump laser are multiplexed into the doped fiber, and the signal is amplified through interaction with the doping ions.
What is semiconductor optical amplifier?
An SOA (Semiconductor Optical Amplifier) is a semiconductor element that amplifies light. Antireflective processing is applied on both facets of a semiconductor laser to eliminate the resonator structure. When light enters from outside the semiconductor, the light is amplified by stimulated emission.
How do you increase saturation?
Gain Saturation by an Optical Pulse The gain after the pulse is then reduced by a factor exp(−Ep / Esat), where Ep is the pulse energy. For example, the gain is reduced to 1 / e ≈ 37% of the initial value, if Ep = Esat. Figure 2: Reduction in gain by a short pulse.
What is saturation intensity?
The saturation intensity is the corresponding optical intensity, i.e., the saturation power per unit area. Usually it is assumed that the gain is small, i.e. input and output powers are similar. For high gain, it is common to refer to the output power.
What is gain saturation?
Homogeneous and Inhomogeneous Saturation Homogeneous gain saturation means that the spectral shape of the gain is not affected by the saturation. This is the case e.g. when all laser-active ions have the same emission spectrum.
What are different types of optical amplifiers?
There are 2 types of optical amplifiers; an OFA (Optical Fiber Amplifier) and SOA (Semiconductor Optical Amplifier). There are 2 further types of OFAs; an EDFA (Erbium-Doped Fiber Amplifier) and an FRA (Fiber Raman Amplifier).
What are the different types of optical amplifiers?
What is saturation in amplifier?
Saturated output power is the maximum output power you can get out from an amplifier. There are a few stages to amplifier operation – the first one is linear operation i.e this is the stage where the output of the amplifier is equal to the input signal + gain.
How do you find saturation intensity?
Definitions: Isat is the peak saturation intensity – the saturation intensity at the peak of the line. It is given by, Isat = hνo/σpeakτ (note it differs by a factor of two from the Isat we used above, but is still of the form 1 photon per cross-section per decay time).
What is gain coefficient?
The gain coefficient describes how the density of photons, u ν(z), changes as they propagate along the z-direction. The definition implicitly used before was. uν(z) dz. = g ν · uν(z)
What happens when an amplifier saturates?
When the output voltage implied by the circuit would exceed the possible range, the op-amp is said to saturate, and it just outputs its maximum or minimum possible voltage instead. We often call the supply voltages the rails.
What determines the saturation level of an amplifier?
Amplifier saturation occurs when the input voltage is greater than: or when the input voltage is less than: Often, we find that these voltage limits are symmetric, i.e.: For example, the output limits of an amplifier might be L+ = 15 V and L- = -15 V.
How do you calculate optical gain?
The optical gain is calculated by adjusting the exponentially increasing amplified spontaneous emission intensity IAL(L) . The gain decreases with increasing temperature. A room temperature gain of 15 dB/cm was observed for a pump intensity of 30 MW/cm2 (5.5-ns pulses).
What causes amplifier saturation?
The op-amp will saturate if the input voltage is increased too much or if the gain is increased too much.
What is the effect of saturation?
the decrease in the intensity of a spectral line (an absorption or emission line) with increasing power of the external resonant electromagnetic radiation.
What is amplifier saturation?
What is saturation output power of a continuous wave amplifier?
For a continuous wave input signal, the amount of power that can be produced by the amplifier is determined by the saturation output power (P sat) parameter. P sat is defined as the output power at which the small-signal gain has been compressed by 3 dB.
What are Boa optical amplifiers?
Booster Optical Amplifiers (BOAs) are single-pass, traveling-wave amplifiers that perform well with both monochromatic and multi-wavelength signals. Since BOAs only amplify one state of polarization, they are best suited for applications where the input polarization of the light is known.
What is optical amplifier?
Such amplifiers are often used in telecommunication systems in the form of fiber-pigtailed components, operating at signal wavelengths between 850 nm and 1600 nm and generating gains of up to 30 dB. The semiconductor optical amplifier is of small size and electrically pumped.
What types of optical amplifiers does Thorlabs offer?
Our SOA1117S and BOA1004P optical amplifiers are also available in the S7FC1013S and S9FC1004P benchtop optical amplifiers, respectively. Thorlabs offers fiber-coupled BOAs and SOAs that exhibit low coupling losses, as well as free-space BOAs as a chip on submount (C) or chip on heatsink (H).