Fiber-to-waveguide coupler based on the parabolic reflector

Dillon, Thomas E.; Murakowski, Janusz; Shi, Shouyuan; Prather, Dennis W.

doi:10.1364/ol.33.000896

Cited by 17 publications

(9 citation statements)

References 8 publications

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“…A focusing reflector based method has been proposed and experimentally verified as well (Dillon et al, 2008). The most straightforward transverse method is an "end-fire" coupler that directly launches the optical field at the input facet of the waveguides.…”

Section: E Focusing and Diagnostic Structuresmentioning

confidence: 99%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

331

184

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The use of infrared lasers to power optical-scale lithographically fabricated particle accelerators is a developing area of research that has garnered increasing interest in recent years. We review the physics and technology of this approach, which we refer to as dielectric laser acceleration (DLA). In the DLA scheme operating at typical laser pulse lengths of 0.1 to 1 ps, the laser damage fluences for robust dielectric materials correspond to peak surface electric fields in the GV/m regime. The corresponding accelerating field enhancement represents a potential reduction in active length of the accelerator between 1 and 2 orders of magnitude. Power sources for DLA-based accelerators (lasers) are less costly than microwave sources (klystrons) for equivalent average power levels due to wider availability and private sector investment. Due to the high laser-to-particle coupling efficiency, required pulse energies are consistent with tabletop microJoule class lasers. Combined with the very high (MHz) repetition rates these lasers can provide, the DLA approach appears promising for a variety of applications, including future high energy physics colliders, compact light sources, and portable medical scanners and radiative therapy machines.

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Section: E Focusing and Diagnostic Structuresmentioning

confidence: 99%

Dielectric laser accelerators

England¹,

Noble²,

Bane³

et al. 2014

Rev. Mod. Phys.

331

184

View full text Add to dashboard Cite

show abstract

“…The grayscale lithography masks utilize high energy beam sensitivity (HEBS) glass in which the OD of the mask material can be precisely controlled by varying the electron beam accelerating potential and electron dose [29] using a standard e-beam writer. The OD variance therefore results in precisely determined transmittance of the mask so that the height of the photoresist after exposure and developing can be varied continuously across the chip [30]- [33].…”

Section: A Design and Fabricationmentioning

confidence: 99%

Chip-Level Multiple Quantum Well Modulator-Based Optical Interconnects

Nair

Haney

2013

J. Lightwave Technol.

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High performance computing systems are becoming increasingly limited by the capacity of interconnects due to the continued scaling down of CMOS critical dimensions, resulting in the implementation of optical interconnects at ever decreasing distances. At the chip level, the communication bottleneck and energy consumption per bit are now major limitations to the continued performance scaling of microprocessors. In this paper, a novel integrated photonic approach is presented that uses polymer waveguides and surface-normal GaAs/AlAs multiple quantum well devices integrated directly onto a silicon chip. The concept provides sub-pJ/b performance and seamless interfacing between the on-and off-chip domains. This is the first demonstrated waveguide-coupled surface-normal MQW-based approach to be fully integrated within a photonic layer and to a large extent mitigates packaging issues for future photonics systems integrated with Si chips. Key aspects of the architecture are efficient and minimum-footprint optical fabrics and low-power-consuming optical transceivers. Gray-scale lithography is used to fabricate the 3-D coupling structures directly in the waveguide polymer layer. Analyses and experimental results show that the optical fabric concept provides the necessary bandwidth density and low power consumption for future chip-scale interconnections.Index Terms-Multiple quantum well modulators, optical interconnects, optical waveguides, photonic integrated circuits.

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“…This method showed an improvement in coupling efficiency from fiber to a waveguide, but 5-micron mode field diameter is still very large in comparison with mode filed diameters of many integrated optical waveguides. Several configurations have been proposed for improving fiber-to-waveguide coupling efficiency in very small size waveguides such as grating coupler [16][17][18], micro-ring vertical coupler [19], parabolic reflector [20], and tapered waveguides [21][22][23][24][25].…”

Section: Introductionmentioning

confidence: 99%

Laser beam shaping and mode conversion in optical fibers

Mayeh

Farahi

2011

Photonic Sens

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A new class of all-fiber beam shaping devices has been realized by inverse etching the end face of single mode and multimode fibers to form a concave cone tip. Concave tip fiber can convert a Gaussian beam profile to a flat top beam profile with a uniform intensity distribution. A flat top beam with intensity variation of approx. 5% and flat top diameter to spot diameter ratio of 67% has been achieved. This device can also change the beam shape from a Gaussian to a donut by moving the observation plane. A flat top multimode fiber beam delivery is attractive for applications which require high power and uniform intensity distribution. In single mode fiber, concave tips could be used to reduce the beam spot size diameter, enabling efficient light coupling from a single mode fiber to an integrated optical waveguide.

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Fiber-to-waveguide coupler based on the parabolic reflector

Cited by 17 publications

References 8 publications

Dielectric laser accelerators

Dielectric laser accelerators

Chip-Level Multiple Quantum Well Modulator-Based Optical Interconnects

Laser beam shaping and mode conversion in optical fibers

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