Sub-femtosecond relative timing jitter of a all-fiber, dual-color laser at 1.0µm and 1.5µm

We demonstrate a dual-color 1.55/1.03 µm all-fiber femtosecond laser exhibiting sub-femtosecond relative timing jitter. The 1.03 µm channel is generated via resonant dispersive-wave emission in a short segment of highly nonlinear fiber pumped by a sub-30-fs, 1.5-µm laser. Despite the commonly assumed high intrinsic noise of dispersive-wave generation in highly nonlinear fiber, we show that optimized nonlinear-conversion conditions combined with a low-noise pump enable sub-femtosecond timing synchronization between the dispersive wave and the signal at 1.5 µm. This work demonstrates the feasibility of low-jitter multicolor ultrafast sources spanning fiber-amplifier gain bands at 1.0 µm, 1.5 µm, and beyond 1.8 µm in a fully integrated all-fiber architecture without active feedback control.