A new concept for a fiber-based wavelength-tunable condensing lens is theoretically and experimentally investigated in terms of its ability to shift the longitudinal focus position as a function of wavelength. By exploiting multimode interference effects with reimaging theory, a compact and robust device, completely contained within a standard FC connector, can be constructed by simply splicing a single-mode fiber (SMF) to a finite length section of multimode fiber (MMF). This paper summarizes the theoretical and experimental results of such a device, with additional results for wavelength sensitivity.
© 2004 IEEE
Waleed S. Mohammed, Alok Mehta, and Eric G. Johnson, "Wavelength Tunable Fiber Lens Based on Multimode Interference," J. Lightwave Technol. 22, 469- (2004)