800-nm digital transmission in 1300-nm optimized single-mode fiber

A Monolithic Dual-Color Total-Internal-Reflection-Based Chip for Highly Sensitive and High-Resolution Dual-Fluorescence Imaging

“…It should be noted that, however, a standard single-mode fiber would typically have a cutoff wavelength near 1300 nm [30]. Thus, at a wavelength of 543 nm (or 473 nm) used in this paper, the singe-mode fibers might transmit not only a fundamental mode, which has a Gaussian distribution, but also higher modes, unless a mechanism to filter out these additional modes is introduced [31]. The 1/e beam radius r = 30 μm (at the imaging plane that is 140 μm after the microlens where the prism base is located), together with the beam 0 • divergence angle, was chosen as the target value for the optimization problem.…”

“…11(a)-(d), there are a high-intensity region in the center excited by the fundamental mode and two much lower intensity regions on two sides of the high-intensity region that might be excited by the second mode. There have been several approaches to filter out the transmission of the higher modes in the single-mode fibers [31], [39], [40]. A small misalignment on the positions of the optical fibers along the longitudinal and vertical axes of the chip could also cause the variation on the size of the TIR fluorescent spots.…”