Tunable laser generation with erbium-doped microfiber knot resonator

Abstract

A tunable laser is demonstrated using a microfiber knot resonator structure made by erbium doped fiber (EDF). The laser is made of a 2 m long EDF where 30 mm of its end section is tapered to con struct a microfiber knot resonator (MKR). The combination of the EDF and MKR generates a stable single wavelength laser at 1555 nm wavelength with a signal to noise ratio (SNR) of 33.7 dB using a 63 mW of 980 nm pump power. The peak wavelength of the laser can be tuned by 340 pm as the MKR diameter reduces from 5.0 to 0.5 mm with an acceptable penalty in output power.

Single longitudinal mode laser generation using coupled microfiber Mach–Zehnder interferometer filter

“…This is attributed to cladding mode interference in the MZI structure, whereby the extremely narrow waist of the tapered fiber arm in the MZI causes the generation of many cladding modes. The interference between these modes thus results in the different periods observed in the transmission spectrum [15].…”

Optical microfiber-loaded surface plasmonic TE-pass polarizer

“…Based on the microfiber structure, both active and passive devices have been proposed and demonstrated, such as lasers [13], sensors [14], resonators [15] and optical tweezers [16]. In addition the increased mode field diameter in the tapered region can result in the extinction of the fuse effect and shows significant potential for the optical network to protect the active equipment from damage caused by the fuse effect [17].…”

Investigation of thermal effects in a resonance condition of microfibre double‐knot resonators as high‐order filter

“…The microfibre knot shows stable light coupling and supports single-mode operation readily. These characteristics have allowed this structure to be considered as modulators and converters [9,10], time delay [11] and tunable lasers [12,13]. Besides, it has functioned as a wide range of sensors for humidity, electricity currentsensing, temperature [14][15][16][17] and magnetic field sensors [18].…”