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Raman amplification /ˈrɑːmən/^[1] is based on the stimulated Raman scattering (SRS) phenomenon, when a lower frequency 'signal' photon induces the inelastic scattering of a higher-frequency 'pump' photon in an optical medium in the nonlinear regime. As a result of this, another 'signal' photon is produced, with the surplus energy resonantly passed to the vibrational states of the medium. This process, as with other stimulated emission processes, allows all-optical amplification. Optical fiber is today most used as the nonlinear medium for SRS for telecom purposes; in this case it is characterized by a resonance frequency downshift of ~11 THz (corresponding to a wavelength shift at ~1550 nm of ~90 nm). The SRS amplification process can be readily cascaded, thus accessing essentially any wavelength in the fiber low-loss guiding windows (both 1310 and 1550). In addition to applications in nonlinear and ultrafast optics, Raman amplification is used in optical telecommunications, allowing all-band wavelength coverage and in-line distributed signal amplification.

See also

• Raman laser
• C.V. Raman
• Raman amplifier
• Chirped pulse amplification
• Regenerative amplification

References

Further reading

• Poem, Eilon; Golenchenko, Artem; Davidson, Omri; Arenfrid, Or; Finkelstein, Ran; Firstenberg, Ofer (26 October 2020). "Pulsed-pump phosphorus-doped fiber Raman amplifier around 1260 nm for applications in quantum non-linear optics". Optics Express. 28 (22): 32738–32749. arXiv:2007.09190. Bibcode:2020OExpr..2832738P. doi:10.1364/OE.404015. ISSN 1094-4087. PMID 33114952. Retrieved 5 January 2022.

External links

• "Raman Amplifiers", in the Encyclopedia of Laser Physics and Technology
• "Simulation of Distributed Raman Amplification (DRA) for fiber-based transmission systems"

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