Abstract
In this paper, we demonstrated a continuous-wave pumping supercontinuum generation in a random distributed feedback fiber laser with a completely open laser cavity. A broadband wavelength conversion was obtained by pumping a 36-km long TrueWaveREACH fiber in anomalous dispersion regime with a high power continuous-wave Raman laser. The spectral broadening was assisted via nonlinear mechanism such as modulation instability and stimulated Raman scattering. An extended 10-dB flat supercontinuum with 129-nm bandwidth spanning over C-, L-, and U-band wavelengths was generated in the forward direction of lasing cavity under 3.65-W pump power. The super-continuum exhibited excellent bandwidth stability in 60 minutes of lasing operation. A simultaneous generation of random Raman laser operating in the backward direction of cavity was also demonstrated within the same gain fiber. The simple laser cavity presented significant versatility in its generation of novel light sources for both telecommunication and applied science applications.
Highlights
Supercontinuum (SC) generation in optical fibers is highly attractive due to its smooth and broad spectral bandwidth that often spans over multiple bands
In this paper, we demonstrated a continuous-wave pumping supercontinuum generation in a random distributed feedback fiber laser with a completely open laser cavity
In Raman-based fiber laser, modulation instability (MI) can be induced by cross phase modulation between high pump power wave and generated Raman Stokes wave in the fiber gain medium [27]
Summary
Supercontinuum (SC) generation in optical fibers is highly attractive due to its smooth and broad spectral bandwidth that often spans over multiple bands. The most common approach to generate SC is to pump high peak power femtosecond pulses into optical fiber where the interplay between dispersion and complex nonlinear processes such as Raman scattering, self- and cross-phase modulations, four-wave mixing and multisoliton will facilitate. More than an octave-spanning SC generation was demonstrated from speciality optical fibers such as highly nonlinear fiber [7], photonics crystal fiber [8], dispersion shifted fiber [9], and small core tapered fiber [10]. The intrinsic parameters of these fibers such as dispersion, nonlinearity and confinement were tailored to efficiently control the pulse evolution to generate SC even at a fairly short optical fiber length [11]. As the inherently noisy process of soliton fission that usually affects the pulse width does not occur in normal dispersion regime [13], the coherence of ultrashort input pulses is preserved during the propagation to result in a uniform spectral and temporal SC profile [14]
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