What is ASE in EDFA?
What is ASE in EDFA?
ASE stands for Amplified Spontaneous Emission.
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).
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 is optical noise?
Fiber-optic communication systems that use optical amplifiers are subject to optical noise, called amplified spontaneous emission (ASE) noise [25–27]. ASE noise is due to spontaneous emission of photons that adds optical noise to the signal during its amplification.
What is ASE source?
ASE(Amplified Spontaneous Emission) light sources are low-coherent light sources ,which combines the both features of high intensity like laser and broad spectrum like LED. Output stability is greater than those of LD and LED, and therefore they are suitable for high accuracy measurement applications.
What is spontaneous emission and stimulated emission?
Spontaneous emission takes place without interaction with other photons, and the direction and phase are random. Stimulated emission takes place when the excited electron interacts with another photon.
What are the components present in EDFA?
In its most basic form, the EDFA consists of a length of EDF (typically 10-30m), a pump laser, and a component (often referred to as a WDM) for combining the signal and pump wavelength so that they can propagate simultaneously through the EDF.
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.
How does a erbium-doped fiber amplifier work?
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. Pump lasers, known as pumping bands, insert dopants into the silica fiber, resulting in a gain, or amplification.
What is EDFA WDM?
EDFA, or Erbium-doped Fiber Amplifier, is the most deployed optical amplifier in the WDM system that uses the Erbium-doped fiber as optical amplification medium to directly enhance the signals. The amplifying medium is a glass optical fiber doped with erbium ions.
What causes optical noise?
In optical homodyne detection, the shot noise in the photodetector can be attributed to either the zero point fluctuations of the quantised electromagnetic field, or to the discrete nature of the photon absorption process.
What noise is present in optical receiver?
The shot noise and thermal noise are the two fundamental noise mechanisms responsible for current fluctuations in all optical receivers even when the incident optical power Pin is constant. Of course, additional noise is generated if Pin is itself fluctuating because of noise produced by optical amplifiers.
How can I measure the ASE of an EDFA?
In the pulse method, since the metastable erbium ions in the EDFA require a relatively long time to recover the ground state, if the on/off switching cycle of the optical input to the EDFA is sufficiently shorter than the recovery time, the ASE can be measured directly by measuring the output of the EDFA while the optical signal is off.
What are erbium-doped fiber amplifiers (EDFA)?
The development of erbium-doped fiber amplifiers (EDFA) in the latter half of the 1990s supported amplification of signals using wavelength-division multiplexing (WDM) and permitted the spread of long-distance, large- capacity communications, such as optical submarine cables and optical subscriber systems.
What does EDFA stand for?
Application Note Optical Amplifier (EDFA) Characteristics Evaluation Optical Amplifier NF/Gain Measurements with MS9740A Optical Spectrum Analyzer MS9740A Optical Spectrum Analyzer Contents 1. Introduction 2. NF/gain Measurement Outline 3.
What are the different methods of ASE interpolation?
(1) Level interpolation method (Direct interpolation method) (2) Polarization nulling method (3) Pulse method In the level interpolation method, the ASE level at the optical signal wavelength is estimated by interpolation from the ASE level near the optical signal wavelength.
