Switchable dual-wavelength SOA-based fiber laser with continuous tunability over the C-band at room-temperature

Ummy, Muhammad A.; Madamopoulos, Nicholas; Razani, Mohammad; Hossain, Abdullah Ridwan; Dorsinville, R.

doi:10.1364/oe.20.023367

Cited by 20 publications

(10 citation statements)

References 29 publications

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“…To establish stable dualwavelength lasing at room temperature, various techniques have been employed to reduce the mode competition. These include exploiting the spatial hole burning effect in a linear cavity [13,14], utilizing two spatially separated phase-shifted DFB structures [15,16], exploiting the polarization hole burning effect by using polarization-maintaining FBGs [17][18][19][20], inserting a piece of unpumped erbium-doped fiber as a saturable absorber [21,22] and even incorporating a semiconductor optical amplifier as an inhomogenously broadened gain medium [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

“…This is mainly because of the relatively low UV photosensitivity of phosphate fibers (compared to silica fibers), which prevents the achievement of high reflectivity gratings with optimized refractive index modulation along the fiber axis as well as because of the large splice losses between the phosphate fiber and SMF-28 fiber. However, achieving a high slope efficiency is not the absolute requirement for most applications of this type of laser [19,21,26].…”

Section: Introductionmentioning

confidence: 99%

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Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser

Hofmann

Schülzgen

et al. 2014

Appl. Opt.

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We propose and demonstrate a 5-cm-long monolithic dual-wavelength single-longitudinal mode distributed Bragg reflector (DBR) all-phosphate fiber laser. Strong UV-induced fiber Bragg gratings are directly written in highly Er/Yb codoped phosphate fiber. The separation between gratings is selected as 1 cm to only excite two longitudinal modes in the DBR cavity. By exploiting the spatial hole burning effect and the polarization hole burning effect, stable narrow-linewidth dual-wavelength lasing emission with 38 pm wavelength spacing and a total emitted power of 2.8 mW is obtained from this DBR fiber laser. A microwave signal at 4.58 GHz is generated by the heterodyne detection of the dual-wavelength laser.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser

Hofmann

Schülzgen

et al. 2014

Appl. Opt.

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“…But, this is not helpful to obtain a stable dual-wavelength lasing in EDFL without eliminating the strong homogenous gain broadening of the EDF effectively. Besides, the SMSR of the output laser is less than 55 dB [18]. In order to obtain stable dual-wavelength lasing, developing novel filters with low cost and highly reliable performance is very significant.…”

Section: Introductionmentioning

confidence: 99%

A dual-pass Mach–Zehnder interferometer filter using a TCF loop mirror for double-wavelength fiber lasers

Zou

Lou

et al. 2013

Appl. Phys. B

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A dual-pass Mach-Zehnder interferometer filter using a section of twin-core fiber (TCF) loop mirror is proposed. The filter is theoretically and experimentally studied for various interferometer arm difference when TCF length is constant. Theoretical results are validated by the experimental demonstration and in good agreement with the experimental results. And then, by using the filter in a ring fiber laser, a stable and switchable dual-wavelength lasing is obtained experimentally. The 3-dB bandwidth and the SMSR of the output laser are 0.015 nm and higher than 62.4 dB, respectively. The peak power fluctuation and wavelength shift are also monitored to be less than 0.04 dB and 0.02 nm over an hour at room temperature. Furthermore, the output laser can be switched between single and dual wavelength by carefully adjusting the PCs. The experimental results show that the filter can suppress mode competition effectively, improve the SMSR availably, and enhance the stability of the output lasing.

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“…These include exploiting the spatial hole burning effect in a linear cavity [87,88], utilizing two spatially separated phase shifted DFB structures [89,90], exploiting the polarization hole burning effect by using polarization-maintaining fiber Bragg gratings [91][92][93][94], inserting a piece of un-pumped Erbium-doped fiber as a saturable absorber [95,96], and even incorporating a semiconductor optical amplifier as an inhomogenously broadened gain medium [97][98][99][100].…”

Section: Introductionmentioning

confidence: 99%

“…This is mainly because of the relatively low UV photosensitivity of phosphate fibers (compared to silica fibers) which prevents the achievement of high reflectivity gratings with optimized refractive index modulation along the fiber axis, as well as because of the large splice losses between the phosphate fiber and SMF-28 fiber. However, achieving a high slope efficiency is not the absolute requirement for most applications of this type of laser[93,95,100].…”

mentioning

confidence: 99%

Photosensitivity and Photodarkening of UV-induced Phosphate Glass Fiber Bragg Gratings and Application in Short Fiber Lasers

Liu¹

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Phosphate glass fiber is an ideal choice for building compact high gain fiber lasers, as the fiber can host high concentrations of rare earth ions. However, the low photosensitivity of phosphate glass fibers prevents the integration of UV-written intra-core fiber Bragg gratings (FBGs) into the fiber laser cavity. The research presented in this thesis is focused on the investigation of photosensitivity of UV-written Bragg gratings in phosphate glass fibers and their application in direct-written short monolithic fiber lasers.A systematic investigation of photosensitivity of Er/Yb doped and undoped phosphate glass fibers is carried out using irradiation of intense 193 nm ArF excimer laser light through a phase mask. Thermal annealing experiment results demonstrate that a thermal growth of grating reflectivity of an FBG in phosphate fiber can be obtained upon heating it at temperatures between 100 -250 °C. A recipe that can reliably obtain strong FBGs with final index modulation amplitudes between 5 and 10×10 -5 in phosphate fibers through the photo-thermal process is proposed.An undesirable side effect of FBGs fabrication in a phosphate fiber is discovered that a photodarkening loss of about 1 dB/cm at C-band is also induced by UV irradiation.The photodarkening loss has been identified as the result of formation of a color center at visible band. Photo-bleaching and thermal-bleaching processes are found to be effective in fully erasing the UV-induced photodarkening loss under condition of not diminishing the grating strength.The application of direct-written strong FBGs in building short monolithic phosphate fiber lasers is investigated. A 3.5-cm-long single-wavelength singlelongitudinal-mode distributed feedback (DFB) fiber laser has been implemented in the iii 1%-2% Er/Yb doped phosphate glass fiber. A laser signal with an output power of 27.5 mW at a linewidth of 20 MHz is achieved. In addition, a 5-cm-long monolithic dualwavelength single-longitudinal-mode distributed Bragg reflector (DBR) all-phosphate fiber laser is also demonstrated. By exploiting the polarization hole burning effect and the spatial hole burning effect, stable narrow-linewidth dual-wavelength lasing emission with 38 pm wavelength spacing and a total emitted power of 2.8 mW is obtained from the DBR fiber laser.iv

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Switchable dual-wavelength SOA-based fiber laser with continuous tunability over the C-band at room-temperature

Cited by 20 publications

References 29 publications

Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser

Short monolithic dual-wavelength single-longitudinal-mode DBR phosphate fiber laser

A dual-pass Mach–Zehnder interferometer filter using a TCF loop mirror for double-wavelength fiber lasers

Photosensitivity and Photodarkening of UV-induced Phosphate Glass Fiber Bragg Gratings and Application in Short Fiber Lasers

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