A method of broadband amplification divides an optical signal of wavelength of 1430 nm to 1620 nm at a preselected wavelength into a first beam and a second beam. The first beam is directed to at least one optical amplifier and produces an amplified first beam. The second beam is directed to at least one rare earth doped fiber amplifier to produce an amplified second beam. The first and second amplified beams are combined.

Broadband amplifier and communication system

A Raman amplifier apparatus includes an optical transmission line with an input to receive an optical signal, an output that passes the optical signal, a first Raman gain fiber and a second Raman gain fiber. A first WDM is positioned between the second Raman gain fiber and the output. A first set of pump wavelengths is input to the first WDM. A second WDM is positioned between the first and second Raman gain fibers. A second set of pump wavelengths is input to the second WDM. At least a portion of the first set of pump wavelengths are different than the second set of pump wavelengths. The first and second set of pump wavelengths propagate in the same direction.

All band amplifier

In one aspect of the invention, a system operable to reduce degradation of an optical signal to noise ratio where signals having multiple wavelengths are communicated over a common optical link includes an amplifier assembly operable to introduce to a lower communication band a first gain and to introduce to a higher communication band a second gain that is different from the first gain. In addition, the system is operable to introduce a variable gain tilt into at least one of the communication bands. The different gains introduced to the higher and lower bands and the variable gain tilt introduced into at least one of the bands result in a reduction of a degradation of optical signal to noise ratio that could otherwise be caused by wavelength dependent attenuation when the communication bands are combined and communicated over an optical link.

Method and system for reducing degradation of optical signal to noise ratio

A multi-stage Raman amplifier (100) includes a first Raman amplifier stage (120) having a first sloped gain profile (30) operable to amplify a plurality of signal wavelengths (116), and a second Raman amplifier stage (121) having a second sloped gain profile (40) operable to amplify at least most of the plurality of signal wavelengths after those wavelengths have been amplified by the first stage. The second sloped gain profile is approximately complementary slope to the slope of the first sloped gain profile. The combined effect of the first and second Raman stages contributes to an approximately flat overall gain profile (50) over the plurality of signal wavelengths.

System and method for wide band raman amplification

A gain-clamped fiber Raman amplifier is proposed and simulated. The results show that, gain variation of less than 0.2 dB over 70 nm bandwidth is obtainable for signal power variation of 18 dB.

/pdf/theoretical-investigation-of-fiber-raman-amplifier-with-1r1cmfl18u.pdf

Theoretical investigation of fiber Raman amplifier with dynamic gain control

We report the gain flattening of dual stage dual wavelength pumped fibre Raman amplifiers flattening the gain using long period fibre grating and a first order interferometric filter. A flattened gain of 60 nm and an average gain of 15.9 dB were achieved.

Broadband gain flattened Raman amplifier to extend operation in the third telecommunication window

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Broadband gain flattened Raman amplifier to extend operation in the third telecommunication window