Reference-frequency generation for optical fiber instrumentation is now restricted to the frequency bands in which the reference materials have well-resolved absorption lines. We study analytically and experimentally the possibility of generating reference wavelengths by use of Raman-enhanced four-photon mixing in an optical fiber. We show that it is possible to generate efficiently frequencies that are 10–40 nm away from the absorption bands of the usual reference materials: acetylene (<sup>12</sup>C<sub>2</sub>H<sub>2</sub>), hydrogen cyanide (HCN), and similar or derived species. As a demonstration we use an acetylene cell to generate reference frequencies that cover the whole <i>C</i> (1530–1565 nm) and some part of the <i>L</i> (1565–1625 nm) transmission bands of the optical fiber.
© 2004 Optical Society of America
(060.2300) Fiber optics and optical communications : Fiber measurements
(060.4370) Fiber optics and optical communications : Nonlinear optics, fibers
(190.4380) Nonlinear optics : Nonlinear optics, four-wave mixing
(190.5650) Nonlinear optics : Raman effect
Sonia Martín López, Miguel González Herráez, Pedro Corredera, María Luisa Hernanz, and Antonio Corróns, "Reference-Frequency Generation by Raman-Enhanced Four-Photon Mixing," Appl. Opt. 43, 3185-3190 (2004)