Threshold reduction of stimulated Brillouin scattering in photonic crystal fiber

Improvement of comb lines quality employing double-pass architecture in Brillouin-Raman laser

“…In addition, the output spectrum has an average OSNR of 20 dB within the flat amplitude bandwidth, which supersedes the OSNR values reported in [8,9,23]. By having the double-pass structure, the SBS threshold is also reduced that translates to higher efficiency of Stokes lines generation as reported in [25].…”

Reduction of stimulated brillouin scattering threshold using bidirectional pumping with pump recycling scheme

“…Add an optical mirror in direct injection method change the method to recycling the transmitted signal back into the SMF. The optical mirror allow more backscattered light which can be reduce the level of the threshold power and speed up the appearance of the SBS [13][14]. For the purpose of investigating the effect of input coupling ratio between the direct pumping and proposed methods, a variable coupler with different coupling ratio is used to distribute the input signal.…”

Simple tunable multiwavelength Brillouin/Erbium fiber laser utilizing short-length photonic crystal fiber

“…The Brillouin amplification makes great contributions to the intensity of the BS signals. The configuration of FLM provides a bidirectional pumping scheme to enhance the generation of BS signals and can greatly reduce the Brillouin threshold of the HNL-PCF [15]. The output is observed and measured by an optical spectrum analyzer (OSA).…”

“…The Brillouin gain threshold of the 70-m-long photonic crystal fiber is greatly reduced and the generation of the multiwavelength is enhanced by the recycling mechanism [14,15]. At the maximum 1480 nm pump power of 110 mW, 10 stable output channels with 0.078 nm channel spacing and 10 nm tuning ranges are achieved.…”