Tunable dual-wavelength-switching fiber grating laser (original) (raw)
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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.
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.
Tunable Multi-Wavelength Erbium Doped Fiber Laser Using Cascaded Apodized Fiber Bragg Gratings
_ A novel tunable multi-wavelength laser using an erbium doped fiber (EDF) as a gain medium is proposed theoretically. The laser source is terminated by a chirped fiber Bragg grating (CFBG) on one side and cascaded apodized FBGs on the other side. Three and five-wavelength tunable EDF laser (EDFL) are demonstrated using applied strains and temperature variations to tune the lasing wavelengths.
A stabilized tunable dual wavelength erbium-doped fiber laser with equal output power
Laser Physics, 2009
Tunable dual-wavelength erbium-doped fiber laser with good stability is experimentally demonstrated. Output power of as high as +5.26 dBm is obtained in dual ring configuration. Both laser output can be tuned to as closed as 0.8 nm spacing between each other, with tuning range of 31.33 nm. The stability of both outputs was tested that results in less than ±0.8 dB and ±0.01 nm in power and wavelength fluctuation, respectively.
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 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.
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.