Four-Wave Mixing of a Laser and Its Frequency-Doubled Version in a Multimode Optical Fiber

Abstract

It is shown that it is possible to couple a laser beam and its frequency-doubled daughter into a multimode optical fiber through the four-wave mixing nonlinear process and generate a new wavelength. The frequency-doubled daughter can be generated in an external crystal with a large second order nonlinearity. It is argued that while this possibility is within the design parameter range of conventional multimode optical fibers, it necessitates a lower-bound for the core-cladding refractive index contrast of the multimode optical fiber.

Keywords

• Kerr nonlinearity
• Four-wave mixing
• multimode optical fiber
• frequency-doubling
• third harmonic generation
• new wavelength generation