Using optimal cavity loss and saturable-absorber passive filter for stable and tunable dual-wavelength erbium fiber laser in single-longitudinal-mode operation

Abstract

In this investigation, we propose and demonstrate experimentally tunable and stable dual-wavelength erbium doped fiber (EDF) double-ring laser scheme using different coupling losses inside cavity loop for wavelength and mode spacing tuning. Besides, a shorter unpumped EDF is also used to filter the side-modes for lasing wavelength in singlelongitudinal-mode (SLM) operation. However, the output mode spacing of dual-wavelength could be limited owing to the homogeneous broadening nature of EDF. As a result, the output performance of the proposed fiber laser have also been analyzed and discussed, such as wavelength tuning range, output power, side-mode suppression ratio (SMSR), stabilities of lasing wavelength and power, relative intensity noise (RIN), etc. Output spectra of lasing dual-wavelength with four samples for the proposed fiber laser in the operating wavelengths under the 50% cavity loss status

Stable Multiwavelength Erbium Fiber Ring Laser With Optical Feedback for Remote Sensing

“…because of their potential applications in dense wavelength division multiplexing (DWDM), optical fiber sensing, optical instrumentation, and photonic generation of microwave signals. Several approaches have been employed to implement multiwavelength erbiumdoped fiber-ring lasers (MEDFRLs) such as short linear cavity distributed Bragg reflector fiber lasers [1], fiber distributed feedback lasers [2] and fiber ring lasers with different ringcavity configurations [3][4][5].…”

Low noise dual-wavelength erbium fiber laser in single-longitudinal-mode operation

“…The measured power of both channels was around -10 dBm, which it is more than 65 dB higher than the amplified spontaneous emission (ASE) noise floor. An interesting conclusion to be drawn from figure 2 is that the proposed scheme is a very low noise topology because the ASE is filtered twice, this being a crucial advantage over some previously reported lasers in the literature [11][12][13][14][15][16].…”

A Single-Mode Erbium Fiber Laser With Flat Power Output and Wide Wavelength Tunability

“…In recent years, continuous-wave (CW) erbium-doped fiber (EDF) laser sources with broad tunability, constant single-longitudinal-mode (SLM) action and flat output spectrum have appealed to great interests, because of the promising applications of optical fiber communication, optical fiber sensor, microwave-photonic, and biophotonics [1][2][3][4]. To reach the wavelength selection in the EDF lasers, using the linear-and ring-based fiber cavities have been studied [5].…”