Multi-wavelength laser generation with Bismuthbased Erbium-doped fiber

Area of Science:

• Photonics and Laser Technology
• Nonlinear Optics
• Fiber Optics Communications

Background:

• Bismuth-based Erbium-doped fibers (Bi-EDFs) offer unique nonlinear properties for optical applications.
• Generating multi-wavelength laser combs is crucial for various fields, including spectroscopy and telecommunications.
• Previous research has explored different methods for laser comb generation, but Bi-EDFs in a backward-pumped configuration for this purpose are novel.

Purpose of the Study:

• To demonstrate, for the first time, a multi-wavelength laser comb utilizing a nonlinear effect in a backward-pumped Bi-EDF.
• To characterize the performance of the Bi-EDF laser comb in terms of line count and spacing.
• To explore the potential of Bi-EDFs in creating compact and efficient optical comb sources.

Main Methods:

• A ring cavity resonator scheme was employed, incorporating a 215 cm long highly nonlinear Bi-EDF.
• Optical isolators, a polarization controller, and a 10 dB output coupler were integrated into the cavity.
• A 1480 nm pump laser was used to excite the Bi-EDF in a backward-pumped configuration.

Main Results:

• The laser successfully generated more than 10 lines of an optical comb.
• The observed line spacing was approximately 0.41 nm.
• The comb generation was achieved using a pump power of 146 mW at 1615.5 nm.

Conclusions:

• The successful demonstration confirms the viability of using nonlinear effects in backward-pumped Bi-EDFs for multi-wavelength laser comb generation.
• This approach offers a promising route for developing novel optical comb sources with potential applications in diverse scientific and technological fields.
• The results highlight the significant nonlinear characteristics of Bi-EDFs, paving the way for further research and development in fiber laser technology.