All-fiber pulsewidth tunable actively Q-switched erbium fiber laser using abrupt-tapered Mach-Zehnder block filter

Abstract

We demonstrate pulsewidth tunable Q-switched erbium fiber lasers using in-line high extinction ratio (> 30 dB) abrupt-tapered fiber Mach-Zehnder block filter and tunable Fabry-Perot filter in laser cavity. The pulsewidth can be tuning over 78 ns -23 ms. Q-switched pulse shape with pulsewidth and repetition rate at 1.84 μs, 60.84 kHz

Tunable filter based on a pair of special long-period fiber gratings and its application in fiber ring laser

“…By incorporating an abrupt tapered MZI filter and a tunable F-P filter in laser 1 The article is published in the original. cavity, an environmental stable and pulsewidth tun able for industry applications is realized [9]. Yeh et al reported a stable and ~34 nm tunable EDF ring laser by using a tunable bandpass filter inside the EDF ring cavity [10,11].…”

“…Tunable filters that realize the wavelength selecting and tuning are exten sive used in the tunable fiber ring lasers, which include fiber Bragg gratings (FBGs) [2,3], Fabry-Perot (F-P) filters [4,5], filters based on multimode interference (MMI) effect [6], single mode biconic fiber taper [7], two tapered MZI [8,9], and tunable bandpass filter [10,11]. The tunable fiber lasers achieved by stretch ing a FBG axially have a tuning range of 40 nm where the fiber used to write a FBG has to experience a com plicated chemical procedure in order to enhance the mechanical strength [2,3].…”

Tunable laser generation with erbium-doped microfiber knot resonator

“…Recently, single frequency Erbium doped fiber lasers (EDFLs) have been shown to be capable of providing mode hop free lasers in the form of distributed feed back (DFB), distributed Bragg reflector (DBR) and ring lasers [8][9][10][11][12][13][14][15]. Many works have also been reported on Q switched and mode locked fiber lasers [16][17][18]. The advantage of fiber lasers is their narrow linewidth (kilohertz range), wavelength tenability, sta bility and direct compatibility with fibre networks.…”

Compact Narrow Linewidth Actively Q-Switched Er–Yb Double-Clad Fiber Laser

“…The active Q-switching technique for laser pulses generation requires the use of an external modulator to obtain pulsed laser operation. In contrast to passive Q-switched lasers, when an active Q-switching technique is applied, the pulse characteristics can be modified independently of the pump power by using an electronic pulses generator, allowing the proper controlling of the laser pulses for the required laser application [14][15][16][17]. In this regard, the use of EYDCF to design active Q-switched fiber lasers has been underexploited.…”