Table of Contents
How does a EDFA 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. EDFA amplification occurs as the pump laser excites the erbium ions, which then reach a higher energy level.
What is EDFA what for it is used?
Erbium-Doped Fiber Amplifier (EDFA) is an optical amplifier used in the C-band and L-band, where loss of telecom optical fibers becomes lowest in the entire optical telecommunication wavelength bands. The use of EDFA has eliminated the need for such O-E and E-O conversion, significantly simplifying the system.
What is EDFA and how it is used with DWDM?
Within a DWDM system, EDFA can be placed in three different places for power compensation: used as booster optical amplifiers on the transmitter side to provide high input power to the fiber span, as in-line amplifiers to compensate for fiber loss in the transmission, and as preamplifiers at the receiver end to boost …
How EDFA can influence the output signal?
The most important feature of the EDFA is gain as it determines the amplification of individual channels when a WDM signal is amplified . The amplified output signal power is measured from the output line and is taken after the filter in the block diagram of Figure 1.
What are the limitations of EDFA?
Disadvantages of EDFA :
- Size of EDFA is large.
- Fixed gain range.
- Gain up flatness.
- Optical surge problem.
- High pump power consumption.
- It cannot be integrated with other semiconductor devices.
Why some fiber changes color of the light?
In fact, all fibers change the color of the light in one way or another. Due to the physical characteristics of the conductor some frequencies travel with less impediment than others and it is impossible to produce a fiber that would have the same attenuation on the whole of the visible spectrum.
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.
What does OTDR stand for?
Optical Time Domain Reflectometer
An Optical Time Domain Reflectometer (OTDR) is a device that tests the integrity of a fiber cable and is used for the building, certifying, maintaining, and troubleshooting fiber optic systems.
What wavelength do EDFAs operate?
around 980 nm
The most common pump wavelength for EDFAs is around 980 nm.
How does Raman amplifier work?
The Raman amplifier makes use of stimulated Raman scattering (SRS) within the fiber, which transfers the energy of higher-frequency pump signals to lower-frequency signals. The amplification occurs along the transmission fiber for the distributed Raman amplifier. This amplifier requires much higher power than the EDFA.
What light does fiber use?
Fiber Optic Cable Fiber optic cables use strands of glass to propagate light. The light pulses transport communication signals between devices. At the center of the fiber optic strand is a small inner core that carries the propagated light. Surrounding the core is the outer cladding.
Which light is used in optical Fibre?
Laser light is used for optical fiber communications for the simple reason that it is a single wavelength light source.
When did the use of EDFA become important?
However, when the signals need to transmit several hundreds of kilometers, it becomes necessary to amplify the signals during transit. EDFA (erbium doped fiber amplifier), commercialized in the early 1990’s, became a key enabling technology for optical communication networks, and has deployed in the field.
What can an EDFA be used for in a network?
This type of setup in telecom systems can help with fiber communications, for example, boosting the power of a data transmitter. An EDFA may also be used to maintain long spans of a passive fiber network and may also be used for some types of equipment testing.
How does EDFA reduce the cost of construction?
By utilizing EDFA, we can dramatically lower construction cost by increasing the repeater spacing to reduce the quantity of regenerative repeaters. The long-haul optical communication system mainly includes the land trunk optical transmission system and the submarine optical fiber cable transmission system.
What kind of fiber is used in EDFA?
The erbium doped fiber (EDF) is at the heart of EDFA technology. It is a conventional silica fiber doped with erbium.