Visible Supercontinuum Generation In A Low Dgd Graded Index Multimode Fiber

We demonstrate over two octaves supercontinuum generation in a graded index multimode fiber using a picosecond microchip laser at 1064 nm. Enhanced visible supercontinuum is obtained in a tunable fashion based on initial launching conditions

Visible Supercontinuum Generation In A Graded Index Multimode Fiber Pumped At 1064 Nm

We observe efficient supercontinuum generation that extends into the visible spectral range by pumping a low differential mode group delay graded index multimode fiber in the normal dispersion regime. For a 28.5 m long fiber, the generated spectrum spans more than two octaves, starting from below 450 nm and extending beyond 2400 nm. The main nonlinear mechanisms contributing to the visible spectrum generation are attributed to multipath four-wave mixing processes and periodic spatio-temporal breathing dynamics. Moreover, by exploiting the highly multimodal nature of this system, we demonstrate versatile generation of visible spectral peaks in shorter fiber spans by altering the launching conditions. A nonlinearly induced mode cleanup was also observed at the pump wavelength. Our results could pave the way for high brightness, high power, and compact, multi-octave continuum sources

Few Mode Multicore Photonic Lantern Multiplexer

We demonstrate an all-fiber multi-mode, multi-core photonic lantern mode multiplexer for SDM applications. Selective excitation of 21 spatial channels, LP01 and LP11a, b modes in 7 cores, with insertion losses below 0.4dB is obtained

Six Spatial Modes Photonic Lanterns

Low-loss all-fiber mode selective photonic-lanterns capable of exciting six spatial fiber modes (4 LP modes) are demonstrated. Mode field profile characterization of photonic lanterns using both step and graded index fibers is presented

Scaling The Fabrication Of Higher Order Photonic Lanterns Using Microstructured Preforms

We fabricate ten- and fifteen-mode photonic lanterns by using microstructured preforms that enables a repeatable fabrication process and scalability to large number of modes. Mode selective capability is demonstrated by independently exciting individual LP mode

Gain-Controlled Erbium-Doped Fiber Amplifier Using Mode-Selective Photonic Lantern

For the first time, we demonstrate the implementation of a core pumped few mode erbium amplifier utilizing a mode selective photonic lantern for spatial modal control of the pump light. This device is able to individually amplify the first six fiber modes with low differential modal gain. In addition, we obtained differential modal gain lower than 1 dB and signal gain of approximately 16.17 dB at λs = 1550 nm through forward pumping the LP21 modes at λp = 976 nm

Few-Mode Erbium-Doped Fiber Amplifier With Photonic Lantern For Pump Spatial Mode Control

We demonstrate a few-mode erbium-doped fiber amplifier employing a mode-selective photonic lantern for controlling the modal content of the pump light. Amplification of six spatial modes in a 5 m long erbium-doped fiber to ∼6.2 dBm average power is obtained while maintaining high modal fidelity. Through mode-selective forward pumping of the two degenerate LP21 modes operating at 976 nm, differential modal gains of \u3c1 dB between all modes and signal gains of ∼16 dB at 1550 nm are achieved. In addition, low differential modal gain for near-full C-band operation is demonstrated

Six Mode Selective Fiber Optic Spatial Multiplexer

Low-loss all-fiber photonic lantern (PL) mode multiplexers (MUXs) capable of selectively exciting the first six fiber modes of a multimode fiber (LP01 , LP11a , LP11b , LP21a , LP21b , and LP02 ) are demonstrated. Fabrication of the spatial mode multiplexers was successfully achieved employing a combination of either six step or six graded index fibers of four different core sizes. Insertion losses of 0.2-0.3 dB and mode purities above 9 dB are achieved. Moreover, it is demonstrated that the use of graded index fibers in a PL eases the length requirements of the adiabatic tapered transition and could enable scaling to large numbers

Six Spatial Modes Photonic Lanterns

Low-loss all-fiber mode selective photonic-lanterns capable of exciting six spatial fiber modes (4 LP modes) are demonstrated. Mode field profile characterization of photonic lanterns using both step and graded index fibers is presented