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- Rugeland, Patrik, 1984-
(författare)
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Applications of monolithic fiber interferometers and actively controlled fibers
- 2013
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Doktorsavhandling (övrigt vetenskapligt/konstnärligt)abstract
- The objective of this thesis was to develop applications of monolithic fiber devices and actively controlled fibers. A special twin-core fiber known as a ‘Gemini’ fiber was used to construct equal arm-length fiber interferometers, impervious to temperature and mechanical perturbations. A broadband add/drop multiplexer was constructed by inscribing fiber Bragg gratings in the arms of a Gemini Mach-Zehnder interferometer. A broadband interferometric nanosecond switch was constructed from a micro-structured Gemini fiber with incorporated metal electrodes. Additionally, a Michelson fiber interferometer was built from an asymmetric twin-core fiber and used as a high-temperature sensor. While the device could be readily used to measure temperatures below 300 °C, an annealing process was required to extend the range up to 700 °C. The work included development, construction and evaluation of the components along with numerical simulations to estimate their behaviors and to understand the underlying processes. The thesis also explored the use of electrically controlled fibers for filtering in the microwave domain. An ultra-narrow phase-shifted fiber Bragg grating inscribed in a fiber with internal electrodes was used as a scanning filter to measure modulation frequencies applied to an optical carrier. A similar grating was used inside a dual-wavelength fiber laser cavity, to generated tunable microwave beat frequencies. The studied monolithic fiber interferometers and actively controlled fibers provide excellent building blocks in such varied field as in microwave photonics, telecommunications, sensors, and high-speed switching, and will allow for further applications in the future.
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- Rugeland, Patrik, 1984-, et al.
(författare)
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Nanosecond monolithic Mach-Zehnder fiber switch
- 2012
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Ingår i: Optics Express. - 1094-4087. ; 20:28, s. 29309-29318
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Tidskriftsartikel (refereegranskat)abstract
- An electrically controlled high-speed all-fiber switch is investigated. It is based on a monolithic Mach-Zehnder interferometer using a Gemini fiber. The fiber is provided with internal electrodes for active control of the phase using high-voltage electrical pulses. The demonstrated switching speed is 20 ns. The monolithic design guarantees that the off- and on-states are attained simultaneously for a broad range of wavelengths (50 nm). The interferometer can be switched-off using a second electrode, providing a 15 ns long optical pulse.
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- Rugeland, Patrik, 1984-, et al.
(författare)
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Photonic scanning receiver using an electrically tuned fiber Bragg grating
- 2009
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Ingår i: Optics Letters. - 0146-9592 .- 1539-4794. ; 34:24, s. 3794-3796
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Tidskriftsartikel (refereegranskat)abstract
- A 5-cm-long electrically tuned fiber Bragg grating is used to filter a microwave signal on an optical carrier at 1.55 µm. A chirped distributed-feedback structure is employed, with a transmission bandwidth of 54 MHz and relative optical carrier rejection of >30 dB for rf frequencies >2 GHz. The rapid monotonic sweep of the Bragg wavelength is translated into a fast-frequency sweep for rf analysis.
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- Rugeland, Patrik, 1984-, et al.
(författare)
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Revisiting twin-core fiber sensors for high-temperature measurements
- 2012
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Ingår i: Applied Optics. - 1559-128X .- 2155-3165. ; 51:25, s. 6227-6232
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Tidskriftsartikel (refereegranskat)abstract
- A twin-core fiber Michelson interferometer is evaluated as a high-temperature sensor. Although linear and reproducible operation up to 300°C is obtained, at higher temperatures (700°C) the refractive index shifts plastically and hysteresis is observed, rendering an untreated sensor head unusable. The shift is shown to be greatly reduced by an annealing process of the fiber for 10 h at 900°C, with which the linear response is preserved.
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- Rugeland, Patrik, 1984-, et al.
(författare)
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Tunable photonic microwave generation based on a novel dual-polarization fiber laser cavity
- 2011
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Ingår i: IEEE Photonics Technology Letters. - 1041-1135 .- 1941-0174. ; 23:24, s. 1878-1880
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Tidskriftsartikel (refereegranskat)abstract
- A novel dual-polarization fiber laser is proposed by incorporating a distributed feedback grating inscribed in a twin-hole fiber with internal electrodes. Dual-polarization lasing is achieved with a spectral separation of 42 pm. By beating the optical waves at a photodiode, a microwave signal at 5.244 GHz is achieved with a signal-to-noise ratio 45 dB. An electrically tuned microwave signal with a tunable range of 150 MHz is demonstrated.
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