Optical fibers and Integrated optics

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Text of Optical fibers and Integrated optics

Optical fibers and Integrated optics

Characterization of a ring resonatorAdvanced Laboratory Practices, 26th May 2016Atri HalderOptical fibers and Integrated optics

UEF // University of Eastern Finland

Resonance2

Guiding in optical fibers / Atri Halder, 26.05.2016If the frequency of the applied force matches with the natural frequency of any structure, then the amplitude of the field increases after each oscillation. This phenomena is known as resonance.

Resonator3

Guiding in optical fibers / Atri Halder, 26.05.2016

AB

Ring Resonator

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Guiding in optical fibers / Atri Halder, 26.05.2016

Full width at half maxima (FWHM)5

Guiding in optical fibers / Atri Halder, 26.05.2016

Free Spectral Range (FSR)6

Guiding in optical fibers / Atri Halder, 26.05.2016

Finesse7

Guiding in optical fibers / Atri Halder, 26.05.2016

Quality Factor (Q-factor)8

Guiding in optical fibers / Atri Halder, 26.05.2016

Micro ring resonator9

Guiding in optical fibers / Atri Halder, 26.05.2016

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Specification of the ring resonator Guiding in optical fibers / Atri Halder, 26.05.2016

Experimental setup

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Guiding in optical fibers / Atri Halder, 26.05.2016

Result: Reference

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Guiding in optical fibers / Atri Halder, 26.05.2016

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Guiding in optical fibers / Atri Halder, 26.05.2016

Transmission spectrum of through port for a gap 300 nm.

Guiding in optical fibers / Atri Halder, 26.05.2016

Enhanced resonance for a gap of 300 nm.

Guiding in optical fibers / Atri Halder, 26.05.2016

Transmission spectrum of through port for a gap 400 nm.

Guiding in optical fibers / Atri Halder, 26.05.2016

Enhanced resonance for a gap of 400 nm.

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Guiding in optical fibers / Atri Halder, 26.05.2016Transmission spectrum of drop port for a gap 400 nm.

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Guiding in optical fibers / Atri Halder, 26.05.2016Transmission spectrum of through and drop port for a gap 400 nm.

Comparison19

Guiding in optical fibers / Atri Halder, 26.05.2016

Comparison20Guiding in optical fibers / Atri Halder, 26.05.2016

CharacteristicsGap of 300 nmGap of 400 nmFWHM0.55 nm0.475 nmFSR1.507 nm1.526 nmFinesse2.743.21Q-factor3005.73291.25Loss18.40 dB/cm15.84 dB/cm

Conclusion21Guiding in optical fibers / Atri Halder, 26.05.2016

There was a high loss in between the bus and the ring.The structure was so small that there was always a problem of coupling.As the gap between the bus and the ring was increased, the resonance varied a lot and we can conclude that for a gap of 400 nm the resonance was best.The whole experimental work was quite challenging.Though we got a good result for different parameters of the ring resonator, we failed to generate good data for the drop port. It was due to imperfections of the structure and lot of dust particles on the sample.

Thank you!uef.fi