By Radio Corporation of America. Electron Tube Division
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20, pp. 1532–7. 12. “UV processing of highly nonlinear fibers for enhanced supercontinuum generation,” Westbrook, P. , Nicholson, J. , Yablon, A. D. In Proc. , February 2004, Los Angeles CA; postdeadline paper PDP27. 13. “Phase matching in birefringent fibers,” Stolen, R. , Bosch, M. , Lin, C. Opt. ; 1981; vol. 6, pp. 213–5. 14. , Wolf, E. Pergamon, Oxford, 1970. 15. , Simon, A. Appl. ; 1979; vol. 18, pp. 2241–51. 16. “80 Gb/s to 10 Gb/s polarization-insensitive demultiplexing with circularly polarized spun fiber in a two-wavelength nonlinear optical loop mirror,” Lou, J.
As a result, it can be shown that, for a broadband fiber OPA in which the gain bandwidth overlaps the Raman peak(s) due to the pump(s), the Raman contribution introduces only a minor distortion of the parametric gain spectrum. This has been shown theoretically and verified experimentally . Hence the theory of Chapter 3 can be expected to provide a good first-order approximation for the gain spectrum of well-phase-matched OPAs, even when SRS is not included. In regions where the parametric gain is weak compared with the Raman gain the reverse situation holds, and one may consider the Raman gain alone as a first approximation.
Several techniques have been demonstrated for reducing or suppressing SBS. By using air gaps along the fiber, as might be implemented with connectors, one can prevent acoustic waves from propagating over the entire fiber length, thereby increasing Pth . Alternatively, placing optical isolators along the fiber impedes the propagation of the reflected optical wave, with a similar effect. Other techniques are based on the fact that the SBS gain has a narrow bandwidth ( νB ≈ 50 MHz) and that pump frequency components falling outside that bandwidth do not generate SBS gain.