Abstract
Mode area scaling of optical fiber is highly desirable for high power fiber laser applications. It is well known that incorporation of additional smaller cores in the cladding can be used to resonantly out-couple higher-order modes from a main core to suppress higher-order-mode propagation in the main core. Using a novel design with multiple coupled smaller cores in the cladding, we have successfully demonstrated a single-mode photonic bandgap fiber with record effective mode area of ~2650µm(2). Detailed numeric studies have been conducted for multiple cladding designs. For the optimal designs, the simulated minimum higher-order-mode losses are well over two orders of magnitudes higher than that of fundamental mode when expressed in dBs. To our knowledge, this is the best higher-order-mode suppression ever found in fibers with this large effective mode areas. We have also experimentally validated one of the designs. M(2)<1.08 across the transmission band was demonstrated.
Highlights
In the course of developing high-power fiber lasers, mode area scaling is a key to mitigate nonlinear effects as a result of high optical intensity, such as stimulated Brillouin scattering (SBS), stimulated Raman scatting (SRS), Self-phase modulation (SPM) and four-wave mixing (FWM) [1,2]
Mode area scaling of optical fiber is highly desirable for high power fiber laser applications
It is well known that incorporation of additional smaller cores in the cladding can be used to resonantly outcouple higher-order modes from a main core to suppress higher-order-mode propagation in the main core
Summary
Mode area scaling of optical fiber is highly desirable for high power fiber laser applications. Using a novel design with multiple coupled smaller cores in the cladding, we have successfully demonstrated a singlemode
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