A stabilized tunable dual wavelength erbium-doped fiber laser with equal output power (original) (raw)
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Laser Physics, 2011
We propose and experimentally investigate a stable and tunable dual wavelength erbium doped fiber (EDF) dual ring laser scheme. Here, two tunable bandpass filters (TBFs) are used inside the dual ring gain cavity to generate dual wavelength lasing. And, due to the gain competition of the EDF gain cavity, the mode spacing (Δλ s) of lasing dual wavelength will be limited at different operating wavelengths. Hence, the minimum and maximum mode spacing in the proposed EDF laser scheme are 0.75 and 15.35 nm in C band range. Besides, the output performances of proposed fiber laser have also been studied and analyzed.
New erbium-doped fiber laser with a double tunable bandpass filter
Optical Engineering, 2008
A new configuration for an erbium-doped fiber laser is reported. It incorporates a linear cavity with fiber loopback and a tunable bandpass filter ͑TBF͒. This configuration suppresses the amplified spontaneous emission and achieves a highly stable output power of more than 18 dBm at 1560 nm. A standard spectrum is obtained with TBF adjustment.
Erbium-doped tunable fiber laser
2008
The Erbium doped fiber laser (EDFL) has demonstrated to be the ideal source for optical communications due to its operating wavelength at 1550 nm. Such wavelength matches with the low-loss region of silica optical fiber. This fact has caused that the EDFL has become very important in the telecomm industry. This is particularly important for Dense Wavelength Division Multiplexing (DWDM) which demands the use of single emission sources with different emission wavelengths. In the long run, this increases the capacity of transmission of information without the necessity to increase the infrastructure, which makes tunable laser sources an important component in DWDM applications. Many techniques for tuning have been demonstrated in the state of the art and we can mention, for example, the ones using birefringence plates, bulk gratings, polarization modified elements, fiber Bragg gratings, and very recently the use of multimode interference (MMI) effects. The MMI consists in the reproduction of single images at periodic intervals along the propagation direction of a multimode optical fiber, taking into account that these single images come from a single mode fiber optic. Here, a compact, tunable, erbium-doped fiber laser is experimentally demonstrated. The mechanism for tuning is based on the multimode interference self-imagining effect, which results in a tunable range of 12 nm and optical powers of 1mW within the region of 1549.78-1561.79nm.
L-band erbium-doped fiber laser with coupling-ratio controlled wavelength tunability
Optics express, 2006
By controlling the output coupling ratio, we demonstrate a novel wavelength-tunable L-band Erbium-doped fiber laser (EDFL) with a maximum tuning range up to 58 nm (from 1567 to 1625 nm) by controlling its output coupling ratio between 1% and 99%. The L-band EDFL is configured by using a bi-directionally dual-wavelength pumped EDFA in close-loop with an output coupler of tunable coupling ratio and an air-gap inserted FC/PC connector pair. Such an EDFL exhibits a quantum efficiency of 42% and an ultra-high power conversion efficiency of 37% under optimized pumping scheme, providing the small-signal gain and output power of ~34 dB and 91 mW, respectively. Low variation of <1.2 dB on channel power, power fluctuation of 0.04% and a narrow linewidth of 0.03 nm are obtained.
IEEE Photonics Journal, 2016
In this demonstration, we propose and investigate a stable and tunable singlelongitudinal-mode (SLM) erbium-doped fiber (EDF) ring laser structure. Here, in order to achieve the SLM output, the "eye-type" triple-ring scheme is designed in this EDF laser to suppress the densely spaced longitudinal modes. In the measurement, the output power and optical-signal-to-noise ratio (OSNR) are between 8.35 and 8.92 dBm and 33.2 and 35.7 dB, respectively, in the wavelength range of 1530 to 1560 nm. The proposed EDF laser architecture not only has free tuning step but provides stabilized and flattened output power spectrum as well.
Widely tunable erbium-doped fiber laser based on multimode interference effect
Optics Express, 2010
A widely tunable erbium-doped all-fiber laser has been demonstrated. The tunable mechanism is based on a novel tunable filter using multimode interference effects (MMI). The tunable MMI filter was applied to fabricate a tunable erbium-doped fiber laser via a standard ring cavity. A tuning range of 60 nm was obtained, ranging from 1549 nm to 1609 nm, with a signal to noise ratio of 40 dB. The tunable MMI filter mechanism is very simple and inexpensive, but also quite efficient as a wavelength tunable filter.
Dual-Wavelength DFB Erbium-Doped Fiber Laser With Tunable Wavelength Spacing
IEEE Photonics Technology Letters, 2000
A novel tunable dual-wavelength distributed-feedback fiber laser is presented. It is based on the optical resonances induced by two local phase shifts introduced in the periodic structure of an erbium-doped fiber Bragg grating. A dynamic control of the phase shifts, which are generated by piezoelectric transducers, permits the tunability of the wavelength spacing between the optical harmonics of the laser signal. The wavelength spacing is continuously tuned from 0.128 to 7 GHz. Moreover, a microwave carrier is created within such frequency tuning range by the heterodyne photodetection of the dual-wavelength laser signal.
Widely tunable erbium doped fiber ring laser based on loop and double-pass EDFA design
Optics & Laser Technology, 2020
• Two novel EDFRL architectures based on loop EDFA and double-pass EDFA designs are proposed. • Wide tuning ranges (C+L band) are achieved using proposed configurations. • Extremely flat output power levels with very high OSNRs (~60 dB) are obtained within the tuning range. • High stability for laser output power and oscillation wavelength are achieved.
Intracavity Loss Optimization in Tunable Dual-Wavelength Erbium-Doped Fiber Laser
A cost effective design of equal output power dualwavelength laser is experimentally demonstrated. In this design, the two wavelength can be tuned simultaneously and cover 31.33 nm within C-band. Simultaneous equal power dual-wavelength laser are produced as the intracavity loss is optimized. We found that effective optimization is achieved by adjusting the cavity with lower loss. The power difference between the two wavelengths is less than ± 0.37 dB and flat within the tuning range.
Intracavity loss control effect on tuning range of tunable dual erbium-doped fiber laser
Laser Physics Letters, 2005
This letter presents the effect of intracavity loss control on the tuning range of erbium-doped fiber laser (EDFL). The intracavity loss is controlled using a variable attenuator fitted inside the laser's cavity. The tuning range of uncontrolled cavity loss is around 3 nm, while the controlled cavity loss tuning range is 30 nm.