What is EDFA noise figure?
By Matthew Alvarez
What is EDFA noise figure?
(3) Noise figure. Amplification by an EDFA adds some noise to the original signal – mainly due to amplified spontaneous emission (ASE) from the EDF – and thus decreases the signal-to-noise ratio (S/N ratio).
What is optical noise figure?
The noise figure F of an optical amplifier (e.g. a fiber amplifier or semiconductor optical amplifier) is a measure of how much excess noise the amplifier adds to the signal.
What is noise figure formula?
Noise Figure is defined as the ratio of signal to noise ratio at the output to that at the input. In other words, NF= (s/n)i/(s/n)o.
What is EDFA and how it works write in short?
In general, EDFA works on the principle of stimulating the emission of photons. With EDFA, an erbium-doped optical fiber at the core is pumped with light from laser diodes. EDFA amplification occurs as the pump laser excites the erbium ions, which then reach a higher energy level.
What is EDFA and how it is used with DWDM?
The pre-amplifier is used to compensate for losses in a demultiplexer near the optical receiver. Placed before the receiver end of the DWDM link, pre-amplifier EDFA works to enhance the signal level before the photo detection takes place in an ultra-long haul system, hence improving the receive sensitivity.
Why is noise figure important?
Noise figure is a number by which the noise performance of a radio receiver, amplifier, mixer or other circuit block can be specified. The lower the value of the noise figure, the better the performance. Essentially the noise figure defines the amount of noise an element adds to the overall system.
What causes optical noise?
The shot noise of a coherent optical beam (having no other noise sources) is a fundamental physical phenomenon, reflecting quantum fluctuations in the electromagnetic field. Shot noise also sets a lower bound on the noise introduced by quantum amplifiers which preserve the phase of an optical signal.
What is ideal and practical values of noise figure?
A high value of noise figure indicates system degradation and poor performance. A typical RF system with cellular and ISM applications in the operating range of 400 MHz to 1500 MHz has a noise figure in the range of 0.9 dB in the low gain mode and 2.3 dB in the high gain mode.
What do you understand by EDFA explain working principle?
What is the function of the EDFA?
Erbium-doped fiber amplifier (EDFA) is an optical repeater device that is utilized to boost the intensity of optical signals being carried through a fiber optic communications system.
Why is erbium used in EDFA?
As we talked above, EDFA uses the erbium-doped fiber as an optical amplification medium. The 1550nm signal is amplified through interaction with the doping Erbium ions. This action amplifies a weak optical signal to a higher power, effecting a boost in the signal strength.
What are the advantages of EDFA?
Advantages of EDFA : Gain is an excess of up to 40 to 50 dB. Low noise 3-5 dB, it is suitable for long-haul application. High pump power utilization. Good gain stability.
