# Optical fibers and Integrated optics

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1. UEF // University of Eastern Finland Characterization of a ring resonator Advanced Laboratory Practices, 26th May 2016 Atri Halder Optical fibers and Integrated optics…
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• 1. UEF // University of Eastern Finland Characterization of a ring resonator Advanced Laboratory Practices, 26th May 2016 Atri Halder Optical fibers and Integrated optics
• 2. Resonance 2 Guiding in optical fibers / Atri Halder, 26.05.2016 If 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. Y(λ) = 1 π 2𝑎 (λ−λ0)2+𝑎2
• 3. Resonator 3 Guiding in optical fibers / Atri Halder, 26.05.2016 A B
• 4. Ring Resonator 4 Guiding in optical fibers / Atri Halder, 26.05.2016 Resonance condition: L × 𝑛 𝑒𝑓𝑓 = N. λ 𝑑 where, L = 2πR R is the radius of the ring resonator. λ 𝑑 is the wavelength of light coupled to the input. 𝑛 𝑒𝑓𝑓 is the effective refractive index of the waveguide.
• 5. Full width at half maxima (FWHM) 5 Guiding in optical fibers / Atri Halder, 26.05.2016 where 𝑛 𝑔 is the group index of the medium, r is the self coupling coefficient, a is the resonator round trip loss coefficient and λ 𝑟𝑒𝑠 is the resonance wavelength. FWHM = (1−𝑟𝑎)λ 𝑟𝑒𝑠 2 π𝑛 𝑔 𝐿 𝑟𝑎
• 6. Free Spectral Range (FSR) 6 Guiding in optical fibers / Atri Halder, 26.05.2016 FSR = λ 𝑟𝑒𝑠 2 𝑛 𝑔 𝐿
• 7. Finesse 7 Guiding in optical fibers / Atri Halder, 26.05.2016 Finesse = 𝐹𝑆𝑅 𝐹𝑊𝐻𝑀
• 8. Quality Factor (Q-factor) 8 Guiding in optical fibers / Atri Halder, 26.05.2016 It represents the number of oscillations required by the confined optical field to get its energy reduced to 1/e of the initial energy. Q = λ 𝑟𝑒𝑠 𝐹𝑊𝐻𝑀
• 9. Micro ring resonator 9 Guiding in optical fibers / Atri Halder, 26.05.2016
• 10. 10 Specification of the ring resonator Guiding in optical fibers / Atri Halder, 26.05.2016
• 11. Experimental setup 11 Guiding in optical fibers / Atri Halder, 26.05.2016
• 12. Result: Reference 12 Guiding in optical fibers / Atri Halder, 26.05.2016
• 13. 13 Guiding in optical fibers / Atri Halder, 26.05.2016 Transmission spectrum of through port for a gap 300 nm.
• 14. Guiding in optical fibers / Atri Halder, 26.05.2016 Enhanced resonance for a gap of 300 nm.
• 15. Guiding in optical fibers / Atri Halder, 26.05.2016 Transmission spectrum of through port for a gap 400 nm.
• 16. Guiding in optical fibers / Atri Halder, 26.05.2016 Enhanced resonance for a gap of 400 nm.
• 17. 17 Guiding in optical fibers / Atri Halder, 26.05.2016 Transmission spectrum of drop port for a gap 400 nm.
• 18. 18 Guiding in optical fibers / Atri Halder, 26.05.2016 Transmission spectrum of through and drop port for a gap 400 nm.
• 19. Comparison 19 Guiding in optical fibers / Atri Halder, 26.05.2016
• 20. Comparison 20 Guiding in optical fibers / Atri Halder, 26.05.2016 Characteristics Gap of 300 nm Gap of 400 nm FWHM 0.55 nm 0.475 nm FSR 1.507 nm 1.526 nm Finesse 2.74 3.21 Q-factor 3005.7 3291.25 Loss 18.40 dB/cm 15.84 dB/cm
• 21. Conclusion 21 Guiding 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.
• 22. Thank you! uef.fi

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