What is backward pumping in an EDFA?

What is backward pumping in an EDFA?

With backward pumping, the EDFA can provide a higher signal optical power at the output, but the forward ASE noise level can also be high. The backward ASE noise level in a backward pumping configuration is relatively low at the input side of the erbium-doped fiber.

Which wavelength is most suitable for pumping an EDFA?

Two typical wavelengths to pump an EDFA are 980 or 1480 nm. When an EDFA is pumped at 1480 nm, Er ion doped in the fiber absorbs the pump light and is excited to an excited state (Excited state 1 in Figure 3).

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 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 …

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.

What wavelength do EDFAs operate?

around 980 nm
The most common pump wavelength for EDFAs is around 980 nm.

How do you calculate EDFA gain?

Gain of EDFA depends on the pump power as well as on the pump wavelength. The figure alongside shows typical gain characteristics as a function of wavelength for two different levels of pump power. It may be seen that for small pumping power, the gain spectrum has a maximum at about nm.

What are the advantages of EDFA?

The main advantage of EDFA is a high gain, wide bandwidth, high output power, high pumping efficiency, low insertion loss, and not sensitive to the polarization state.

What is the difference between EDFA and Raman amplifier?

The main difference: the amplification mechanism is different. Edfa uses the principle of stimulated radiation of EDF fiber to amplify the optical signal. Raman amplification uses the Raman effect to achieve energy conversion and amplify the optical signal.

Which effect is used in optical amplifier?

Most optical amplifiers are laser amplifiers, where the amplification is based on stimulated emission. Here, the gain medium contains some atoms, ions or molecules in an excited state, which can be stimulated by the signal light to emit more light into the same radiation modes.

What are the types of optical amplifier?

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 is the difference between connectors and splices?

Connectors and splices link the ends of two fibers both optically and mechanically. The two are not interchangeable. A connector is mounted on the end of a cable or optical device so it can be attached to other cables or devices. In contrast, splices are permanent junctions between a pair of fiber ends.

Why is EDFA used as a booster amplifier?

When used as the booster amplifier, EDFA is deployed in the output of an optical transmitter to improve the output power of the multi-wavelength signal having been multiplexed, as shown in Figure 3. In this way, distances of optical communication transmission can be extended. This application form places a demand of higher output power on EDFA.

What kind of pump energy is used in EDFA?

The pump energy may either be 980 nm pump energy, 1480 nm pump energy, or a combination of both. Practically, the most common EDFA configuration is the forward pumping configuration using 980 nm pump energy, as shown in the Figure 2. After learning what is EDFA, and EDFA working principle.

What kind of optical repeater is EDFA?

What Is 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.

What is the typical edfa100p noise figure?

The typical EDFA100P noise figure as a function of the wavelength. The blue-shaded region denotes the specified operating wavelength range. Compared to booster optical amplifiers (BOAs) and semiconductor optical amplifiers (SOAs), erbium-doped fiber amplifiers (EDFAs) can amplify femtosecond pulses to significantly higher peak power levels.