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Distributed Feedback Imprinted Electrospun Fiber Lasers
Advanced Materials, 2014Imprinted, distributed feedback lasers are demonstrated on individual, active electrospun polymer nanofibers. In addition to advantages related to miniaturization, optical confinement and grating nanopatterning lead to a significant threshold reduction compared to conventional thin-film lasers.
Persano L +7 more
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Feedback linearization approach to distributed feedback manipulation
2012 American Control Conference (ACC), 2012This report formulates the problem of a distributed planar manipulation realized by shaping a spatially continuous force field. It also suggests a control strategy based on feedback linearization. Force fields derived from potential fields are considered.
Z. Hurak, J. Zemanek
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Photodimer Distributed Feedback Laser
Applied Physics Letters, 1972A tunable (0.567–0.605 μ) solid-state dye laser with a small active volume (10 μ×80 μ×1 cm), which uses a nondestructively read-reversible optical-memory material to control the intensity and wavelength of the laser emission, is described. The optical-memory material, photodimers of acridizinium ethylhexanesulfonate, provides distributed feedback in ...
R. L. Fork +2 more
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2013 IEEE XXXIII International Scientific Conference Electronics and Nanotechnology (ELNANO), 2013
A new technique for circuit feedback analysis is presented. A formula for the return ratio is derived using a strict definition of feedback. The technique may be applied in both laboratory-based and computer-aided analysis of feedback in electronic circuits and other dynamic systems.
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A new technique for circuit feedback analysis is presented. A formula for the return ratio is derived using a strict definition of feedback. The technique may be applied in both laboratory-based and computer-aided analysis of feedback in electronic circuits and other dynamic systems.
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Analysing distributed feedback waveguides
IEE Proceedings - Optoelectronics, 1999A method for analysing distributed feedback waveguides with arbitrary refractive index profiles is reported. The method considers a waveguide as a number of segments within which the reflection is weak, and thus the relevant transmission loss and multiple reflections can be neglected.
J. Gong +4 more
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Distributed feedback transistor laser
Applied Physics Letters, 2010Single longitudinal mode operation of an InGaP/GaAs/InGaAs quantum well heterojunction bipolar transistor laser is reported. A third order distributed feedback surface grating is fabricated in the top emitter AlGaAs confining layers using soft photocurable nanoimprint lithography.
F. Dixon, M. Feng, N. Holonyak
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2013
Good quality long distance optical transmission over fiber needs lasers which emit at a single wavelength. This is almost universally realized by putting a wavelength-dependent reflector into the laser cavity, in a distributed feedback laser. In this chapter, the physics, properties, fabrication, and yields of distributed feedback lasers are described.
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Good quality long distance optical transmission over fiber needs lasers which emit at a single wavelength. This is almost universally realized by putting a wavelength-dependent reflector into the laser cavity, in a distributed feedback laser. In this chapter, the physics, properties, fabrication, and yields of distributed feedback lasers are described.
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1982
All of the lasers that have been described so far depend on optical feedback from a pair of reflecting surfaces, which form a Fabry-Perot etalon. In an optical integrated circuit, in which the laser diodes are monolithically integrated within the semiconductor wafer, it is usually very difficult to form such reflecting surfaces.
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All of the lasers that have been described so far depend on optical feedback from a pair of reflecting surfaces, which form a Fabry-Perot etalon. In an optical integrated circuit, in which the laser diodes are monolithically integrated within the semiconductor wafer, it is usually very difficult to form such reflecting surfaces.
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Matching of distributed-feedback structures
Optics Letters, 1992Distributed-feedback structures may provide the increased dispersion required for soliton switching when materials with increased nonlinearity become available. Over the bandwidth of the pulses used, the structure will have to appear matched to the input and output.
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Feedback in distributed amplifiers
IEEE Transactions on Microwave Theory and Techniques, 1990A model is presented for parallel and series feedback effects in distributed amplifiers, and their frequency-dependence characteristics are discussed. A six-element distributed amplifier utilizing series feedback is described. The results show a 2-dB improvement in small-signal gain over the 2-18-GHz frequency range compared to a conventional ...
M. Riaziat, S. Bandy, L.Y. Ching, G. Li
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