Optical fibers and Integrated optics

UEF // University of Eastern Finland

Characterization of a ring resonatorAdvanced Laboratory Practices, 26th May 2016

Atri Halder

Resonance

2Guiding 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) =

Resonator

Ring Resonator

Resonance condition: = N. where, L = 2πR

R is the radius of the ring resonator. is the wavelength of light coupled to the input. is the effective refractive index of the waveguide.

Full width at half maxima (FWHM)

where is the group index of the medium, r is the self coupling coefficient, a is the resonator round trip loss coefficient and is the resonance wavelength.

FWHM =

Free Spectral Range (FSR)

Finesse

Finesse =

Quality Factor (Q-factor)

It represents the number of oscillations required by the confined optical field to get its energy reduced to 1/e of the initial energy.

Micro ring resonator

Specification of the ring resonator

Guiding in optical fibers / Atri Halder, 26.05.2016

Experimental setup

Result: Reference

Transmission spectrum of through port for a gap 300 nm.

Enhanced resonance for a gap of 300 nm.

Transmission spectrum of through port for a gap 400 nm.

Enhanced resonance for a gap of 400 nm.

Transmission spectrum of drop port for a gap 400 nm.

Transmission spectrum of through and drop port for a gap 400 nm.

Comparison

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

Conclusion

• 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

Optical fibers and Integrated optics

Documents

fibers And Probes - Ocean Optics · Fibers and Probes. Fibers and Probes ... Transmission Efficiency of Optical Fibers: ... Transmission Characteristics of VIS-NIR and Mid-IR Options:

Fiber Optics SARA MAEN. What is fiber optics? Fiber optics (optical fibers) are long, thin strands of very pure glass about the diameter of a human hair

1 Stephen SchultzFiber Optics Fall 2005 4. Optical Fibers

Optical fibers communicatiobyom

1. Optical Fibers · Optical Fibers 1.1 Al-Coated Silica Fibers ... Al-coated fibers have all benefits of silica-silica fibers. Additional significant advantages include a superior

1 Chapter 2. Optical Fibers Geometrical Optics & Wave Optics in Fiber Loss Dispersion Nonlinearity

Suppression of stimulated Brillouin scattering in optical ... · Suppression of stimulated Brillouin scattering in optical fibers ... Fiber optics amplifiers and ... 100 suppression

February 2011 CLASSIFICATION DEFINITIONS 385 - 1 …The optical fibers and waveguides ... including optical waveguides, and subclass 454 ... subclass 484 for scanning with fiber optics

Lect5-Optical Fibers 2

FutureGuide Optical Fibers - Fujikura · Not only optical characteristics, ... optical fibers are glass fibers with polymer coating foroptical signal transmission in optical networks

FIBER SYSTEMS Glass Fiber Optics - Farnell element14 · 2012. 4. 3. · FIBER SYSTEMS SENSORS GLASS FIBERS Glass Fiber Optics Specifications Construction Combination of optical glass

Ocean Optics Fibers Probes

Applications of Nonlinear Optics and Optical Fibers · 2012-01-27 · Applications of Nonlinear Optics and Optical Fibers Thomas Vestergaard Andersen Department of Physics and Astronomy

Doped Optical Fibers

CHAPTER 10 OPTICAL FIBERS AND FIBER- OPTIC COMMUNICATIONS · 2013. 2. 8. · CHAPTER 10 OPTICAL FIBERS AND FIBER-OPTIC COMMUNICATIONS Tom G . Brown The Institute of Optics Uni y ersity

Fiber Optics Technology. Introduction to Optical Fibers. Fibers of glass Usually 120 micrometers in diameter Used to carry signals in the form of light

FIBER OPTIC COMMUNICATIONS - University of Texas at …torlak/courses/ee4367/lectures/FIBEROPTICS.pdf · FIBER OPTIC COMMUNICATIONS ... Optical Fibers Fiber optics (optical fibers)

LECTURE NOTES - crectirupati.comcrectirupati.com/sites/default/files/lecture_notes/OFC NOTES.pdf · Introduction to Optical Fibers: Historical Development1.1. Fiber optics deals with

Introduction to Fiber Optics - University of Babylon · What are Fiber Optics? Fiber optics (optical fibers) are long, thin strands of very pure glass about the diameter of a human

types of optical fibers