Abstract
A stable and wavelength-tunable S-band erbium-doped fiber (EDF) ring laser with single-longitudinal-mode oscillation over the operating range of 1480.6 to 1522.9 nm is proposed and experimentally demonstrated. The proposed ring laser provides a fine mode restriction and guarantees the single-frequency operation based on a shorter length EDF serving as auto-tracking filter. Therefore, the performances of output power of > 10 dBm, power stability of < 0.05 dB, central wavelength variation of <0.01 nm, and side-mode suppression ratio (SMSR) of > 49.1 dB have been experimentally demonstrated in the operating range of 1488.7 to 1505.7 nm.
Highlights
Single-longitudinal-mode operation in erbium-doped fiber (EDF) ring lasers is becoming all the more necessary for wavelength division multiplexed (WDM) communications and fiber sensor systems
Several techniques have been studied, such as using a passive multiple-ring cavity or a compound ring resonator composed of a dual-coupler fiber ring (DCFR) to guarantee single-mode laser oscillation [1,2], integrating two cascaded FFP filters of widely different free spectral ranges (FSRs) into cavity to provide full tunability and SLM operation [3], and using an unpumped EDF as a narrow bandwidth autotracking filter [4]
This ring laser cannot provide single-mode oscillation to meet the requirement for a stable S-band light source in future WDM networks
Summary
Single-longitudinal-mode operation in erbium-doped fiber (EDF) ring lasers is becoming all the more necessary for wavelength division multiplexed (WDM) communications and fiber sensor systems. A Sband fiber ring laser, which can operate at the wavelength range from 1480 to 1520 nm, has been reported [5] This ring laser cannot provide single-mode oscillation to meet the requirement for a stable S-band light source in future WDM networks. We propose and experimentally demonstrate a tunable single frequency Sband fiber ring laser using a saturable-absorber-based autotracking filter, which is composed of a shorter length of unpumped EDF and an optical reflector (OR). C : 1 × 2 and 3 dB Optical Coupler W : 980/1550 WDM Coupler PC : Polarization Controller OR : Optical Reflector EDF : Erbium-Doped Fiber FFP-TF : Fiber Fabry-Perot Tunable Filter
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