Stable dual-wavelength single-longitudinal-mode ring erbium-doped fiber laser for optical generation of microwave frequency

Abstract

We demonstrate a simple dual wavelength ring erbium doped fiber laser operating in single lon gitudinal mode (SLM) at room temperature. A pair of reflection type short period fiber Bragg gratings (FBGs), which have two different center wavelengths of 1545.072 and 1545.284 nm, are used as the wave length selective component of the laser. A segment of unpumped polarization maintaining erbium doped fiber (PM EDF) is acted as a narrow multiband filter. By turning the polarization controller (PC) to enhance the polarization hole burning (PHB), the single wavelength and dual wavelength laser oscillations are observed at 1545.072 and 1545.284 nm. The output power variation is less than 0.6 dB for both wavelengths over a five minute period and the optical signal to noise ratio (OSNR) is greater than 50 dB. By beating the dual wavelengths at a photodetector (PD), a microwave signal at 26.44 GHz is demonstrated.

Stable Dual-Wavelength Erbium Fiber Ring Laser With Optical Feedback for Remote Sensing

“…As shown in the experimental results, optical feedback provides some important advantages for lasers operating in SLM, such as an increase in the power stability, and a noticeable linewidth narrowing. This is a crucial advantage over some previously reported lasers in the literature [12], [32]. It is worth mentioning that the main improvement of the feedback is that allows the system to work in a stable regime, and what is more, without the feedback path the equalization of the emission lines is not possible.…”

Characterization of a dual‐wavelength erbium‐doped fiber laser with overlapping cavity incorporating chirped fiber bragg grating as whole reflecting mirror

“…In order to reach the goal of multiwavelength propagation, various approaches have been considered. These methods include frequency shifting , polarization hole burning and intensity dependent loss . The advantages of non‐linear effects in developing multiwavelength lasers such as four‐wave mixing effect and Brillouin scattering in the laser cavity , were also reported.…”

Stable microwave generation based on a brillouin fiber laser with saturable absorber

“…Microwave signal sources generated by optical approach with low phase noise, narrow linewidth, and high stability are valuable in many potential applications, such as wireless communications , radio‐over‐fiber (ROF) . Many techniques have been proposed to achieve dual‐wavelength oscillations, such as incorporating arrayed waveguide gratings (AWG) as the wavelength selective elements , or tunable narrow bandwidth filter , a pair of fiber Bragg gratings (FBG) , a chirped moiré fiber Bragg grating , inserting dual‐pass Mach‐Zehnder interferometer , or special laser . Recently, results achieving stable dual‐wavelength laser are mostly based on stimulated Brillouin scattering .…”