Addressing Fiber-to-Chip Coupling Issues in Silicon Photonics

Conejos, Galan; Vicente, José

doi:10.4995/thesis/10251/9196

Cited by 3 publications

(2 citation statements)

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“…Each of the micro-rings has a radius of 10 µm and all waveguide widths are 400 nm. The light is introduced into and extracted out of the waveguides by integrated grating couplers [17,18]. The silicon slab and waveguides are fabricated on top of a 2 µm silicon dioxide (SiO 2 ) buried oxide (BOX) layer.…”

Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of the Intrinsic Function of a Photonic Switch

Lydiate

2018

Front. Phys.

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In this paper, I provide modeling and simulation results which show that a photonic switch can be realized by the application of two superluminescent light emitting diodes to a configuration of three 10 µm radius micro-ring resonators. The 130 nm silicon on insulator rib structure is adopted for the simulations. The three 10 µm radius rings have a resonant wavelength of 1.5487 µm. The on or off state, at a single output port, is realized by the application of a superluminescent diode at either, one or the other, of the two input ports. The output intensity, at the ring resonant wavelength, is shown as a single normalized peak representing a 1 or the "on" condition. The single peak is realized by the application of the "on" superluminescent diode. The "off" or the 0 condition, realized by the application of the "off" superluminescent diode, is exhibited at the output by the introduction of an optical transparency at the single peak resonant wavelength. The minimum of the optical transparency can be adjusted by changing the coupling gap distances of the design. The transparency minimum introduces an error detection feature whereby a failure of the "off" excitation superluminescent diode results in a zero or noise floor output. The transparency minimum can be increased to raise the off state minimum above the measurement apparatus noise floor. The output of the switch can be detected using a simple photodiode intensity detection method.

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Section: Introductionmentioning

confidence: 99%

Modeling and Simulation of the Intrinsic Function of a Photonic Switch

Lydiate

2018

Front. Phys.

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“…Direct coupling with <1dB coupling loss to the single mode fiber is possible with this approach. By combining the two methods, the input fiber was changed back to a lensed fiber with a mode field diameter of 2.5 μm, achieving a minimum 0.36 dB coupling loss [58,[62][63][64].…”

Section: Fiber-chip Couplermentioning

confidence: 99%

Integrated photonic chip for quantum key distribution

Zhang¹

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Silicon photonic technologies exploit silicon as an optical material to build a wide array of devices and systems. It has a vast and growing market in fields such as telecommunications, sensors, displays, and biomedical instrumentations. The flexibility, modularity and stability of silicon photonic systems provide unprecedented opportunities for next-generation quantum key distribution (QKD) and quantum networking. This doctoral thesis focuses on the design, simulation, fabrication, and experiment of QKD chips based on silicon photonics. Crucial components for QKD chips are designed and fabricated, including the grating coupler, polarization beam splitter, polarization rotator, modulator, photodetector, ring resonator and interferometer. Using these components, chip-based continuous variable quantum key distribution (CV-QKD) is demonstrated for the first time. The thesis focuses on three parts: the passive components, the active components, and the integrated QKD chip. For the passive components, the twodimensional grating coupler can be used as a path-to-polarization mode converter, the polarization beam splitter separates or combines two polarization states on-chip, and the polarization rotator rotates the polarization state between transverse electric and transverse magnetic modes. All the polarization manipulation components are essential for expanding the available degree of freedom of the photon. The Mach-Zehnder interferometer and ring resonator are the core components used in the modulator. Both are designed, simulated, fabricated and experimentally characterized. Active components, including modulators and detectors are also studied in this thesis. For modulator, a thermo-optic modulator and a carrier injection modulator are Nomenclature XXII Nomenclature ALD Atomic layer deposition AM Amplitude modulator ASE Amplified spontaneous emission BARC Bottom anti-reflective coating Bps Bits per second CMOS Complementary metal-oxide-semiconductor CMP Chemical-mechanical planarization COW Coherent one way CVD Chemical vapor deposition CV-QKD Continuous variable QKD CW Continuous wave

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