Multiwavelength fiber laser based on the utilization of a phase-shifted phase-only sampled fiber Bragg grating

Abstract

A semiconductor-optical-amplifier-based fiber laser incorporating with a phase-shifted phase-only sampled fiber Bragg grating (FBG) is proposed and experimentally demonstrated. Thanks to the intrinsic property of the phase-shifted phase-only sampled FBG, the proposed approach has an unique advantage, enabling one to tune and switch all the wavelength lasing simultaneously. The obtained fiber laser has a stable output with more than 30 wavelengths lasing. The 3 dB linewidth is approximately 13 pm, the signal-to-noise ratio is larger than 50 dB, and the nonuniformity of the output is smaller than 7.4 dB.

Single linearly polarized, widely and freely tunable two wavelengths -doped fiber laser

“…3 and 8, obviously, this Y 3þ b -doped fiber laser is not a single-longitudinal-mode two-wavelengths laser. But the singlelongitudinal-mode lasing in each wavelength of the laser is still expected in our configuration through incorporating a phase-shift fiber Bragg grating filter [3] or using a very short high gain E 3þ r -Y 3þ b co-doped PM fiber [22] in each wavelength arms (polarizations). Different lasing wavelengths can be obtained by tuning the temperature of the PM FBGs or changing the period of the custom gratings (and different wavelength spacing can be achieved by using different PM Y 3þ b -doped fiber).…”

“…Various techniques have been proposed to realize two (multi-) wavelength oscillations in either a linear cavity or a ring cavity [3][4][5][6][7][8]. Feng et al [9] also used two polarizations maintaining (PM) FBGs in a linear cavity erbium-doped fiber laser and generated single polarization switchable dual-wavelength laser.…”

Recent advances in the design and fabrication of high channel-count fiber bragg grating and its application to dispersion compensation and multi-wavelength fiber laser

“…In our case, ( ) z s 1 is assumed to be an amplitude-assisted phase-only sampling function (AAPS) with period of 1 P , and meanwhile the ( ) z s 2 is assumed to be the general phase-only sampling function (POS) with period of 2 P [7]. By using the simulated annealing algorithm and Gerchberg-Saxton iterative method [7,9], these two sampling functions are optimized and their in-band channels are assumed to be To confirm the above proposal, a 405-channel FBG covering a wavelength range of 324 nm is designed by utilizing a 9-channel AAPS function and a 45-channel POS function. The index modulation and phase contribution of the 405-channel FBG are shown in Figs.…”

“…Multi-channel fiber Bragg grating has recently attracted great interest due to its excellent channel performances for wavelength filtering used as either the chromatic dispersion compensator or the comb filter for multi-wavelength fiber laser sources [1][2][3][4][5][6][7]. However, with increasing the number of wavelengthdivision-multiplex (WDM) channels to cover the full S-, C-, or L-band, high channel-count FBG device becomes extremely difficult to realize due to the requirements of a considerably high index-modulation and the tremendous precision of the FBG writing tools.…”

A comparison on design of multi-channel sampled fiber Bragg gratings with phase-shifts

“…The fiber Bragg grating (FBG) technology has contributed very important developments to both the telecommunications and the fiber optic sensing fields such as tunable semiconductor reflectors [1,2], chromatic dispersion compensators [3,4], multi-channel optical filters [5][6][7][8][9], multi-wavelength fiber lasers [10,11] and temperature measurements [12]. Multi-channel optical filters realized using sampled fiber Bragg gratings have recently attracted great interest in wavelength division multiplexing (WDM) systems of the modern superfast lightwave communication networks.…”