Quintuple-wavelength EDF laser based on multimode fibers with different core diameters

Abstract

A switchable quintuple-wavelength erbium-doped fiber laser using the linear-cavity configuration is proposed and demonstrated experimentally at room temperature. It is composed of two Sagnac loops that act as the cavity mirrors in the resonant cavity and contain two kinds of multimode fibers with different core diameters (50 and 62.5 µm). The two loops become two comb filters to jointly excite the multi-wavelength output. By using the effects of multimode interference and polarization hole-burning, and after adjusting a polarization controller, the laser can switch flexibly to output nine different kinds of modes from single-wavelength to quintuple-wavelength. All lasing lines with a narrow linewidth of less than 0.25 nm have an optical signal-to-noise ratio of more than 14 dB. The laser has good power uniformity shows good stability with respect to the wavelength and peak power.

Linear cavity erbium-doped fiber laser employing PM-PCF based Sagnac loop comb filter for wavelength tunable laser generation

“…) sin θ exp where θ represents the angle between incident light polarization angle and PMF fast axis, and φ2 means the phase delay generated by PC. The total phase difference of transmitted light of the Sagnac loop can be given by equation (3). When φ is tuned, the transmissivity profile will be changed…”

“…Multi-wavelength tunable erbium-doped fiber laser (EDFL) have numerous advantages such as flexible wavelength tuning range, long working span, high signal to noise ratio (SNR), narrow linewidth and stable laser output [1][2][3][4][5], thus, * Author to whom any correspondence should be addressed.…”

Triple-wavelength EDF laser based on phase-shifted fiber grating and 50 μm MMF

“…The multiwavelength fiber lasers have been focused on for their applications in many important fields, such as dense wavelength division multiplexing optical communication systems, optical fiber sensor systems, etc [1][2][3][4][5][6].…”