Abstract
The experiment reports a kind of L-band dissipative soliton resonance (DSR) nanosecond Er-doped fiber laser. The passive mode-locked L-band DSR pulse is achieved in a figure-eight structure by using the nonlinear-amplifying-loop-mirror (NALM). The repetition rate of pulse is 468 kHz. At the maximum pump power of 398 mW, the output power is 25 mW with a pulse energy of 45 nJ. By adjustment of polarization state in cavity, the output pulse can be switched among 4 different DSR states with central wavelength of 1572, 1585, 1590 and 1605 nm discretely, presenting different peak power and pulse width. We can determine that the adjustment of polarization state changes the loss spectra of cavity and the 4 DSR states operate in different balance points. The tunable DSR pulse duration is from 120 to 150 ns by increasing the central wavelength.
Highlights
In recent years, erbium-doped fiber lasers (EDFLs) operating in L-band (1565–1625 nm) have become a hot spot of research in the field of laser due to the extensive applications in the field of optical communication, medicine, sensing, and laser spectrometry [1], [2] The mode-locked spectrum centered in L-band can enlarge the bandwidth of optical communication and sensing [3], [4]
We can determine that the adjustment of polarization state changes the loss spectra of cavity and the 4 dissipative soliton resonance (DSR) states operate in different balance points
In order to realize L-band laser pulses output from nanosecond to femtosecond, different passively mode-locked techniques or devices have been put into applications, such as semiconductor saturable absorber (SESAM) [4], nonlinear polarization rotation (NPR) [6]–[9], nonlinear optical loop mirror (NOLM) [5], [10], nonlinear amplifier loop mirror (NALM) [11], carbon nanotubes (CNT) [12] and graphene [13], [14]
Summary
Erbium-doped fiber lasers (EDFLs) operating in L-band (1565–1625 nm) have become a hot spot of research in the field of laser due to the extensive applications in the field of optical communication, medicine, sensing, and laser spectrometry [1], [2] The mode-locked spectrum centered in L-band can enlarge the bandwidth of optical communication and sensing [3], [4]. In order to realize L-band laser pulses output from nanosecond to femtosecond, different passively mode-locked techniques or devices have been put into applications, such as semiconductor saturable absorber (SESAM) [4], nonlinear polarization rotation (NPR) [6]–[9], nonlinear optical loop mirror (NOLM) [5], [10], nonlinear amplifier loop mirror (NALM) [11], carbon nanotubes (CNT) [12] and graphene [13], [14] These L-band pulses can operate both in normal and anomalous dispersion regimes and exist in various forms of solitons such as conventional solitons, similaritons, bound solitons and dissipative solitons. As far as we know, EDFL generating DSR pulse with switchable wavelength in L-band has not been demonstrated
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