Extending Mode Areas of Single-mode All-solid Photonic Bandgap Fibers
Clemson University Research Foundation Clemson United States
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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 approximately 2650 micrometer2. 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. M21.08 across the transmission band was demonstrated.
- Lasers and Masers
- Fiber Optics and Integrated Optics