OEO (OptoElectronics Oscillators)
Integrated Microwave Photonics
Components of OEO
1. Laser Diode
2. Electrooptic Modulator (phase modulator or mach zehnder modulator)
3 Ring resonator (All pass microring resonator, Add Drop microring Resonator)
4. PhotoDiode
5. LNA
6. Filter
7. Coupler
Terms of OEO
1. Phase Noise
2. Frequency Spectral Range (FSR)
3. SMSR
4. 3dB Electro Optic bandwidth
5. Q factor
6. Power
7. Vpi
8. Extinction Ratio
9. Insertion Loss
10. Side Mode Spacing
11. Coupling Power Ratio
12. Group Index
13. Effective Index
14.RIN
Materials needed for OEO
1. Silica
2. Indium Phosphide (InP)
3. Silicon on Insulator
4. Lithium Niobate on Insulator
5. Thin Film Lithium Niobate
Methods of Fabrications
1. Heterogeneous
2. Hybrid
3. Monolithic
Terms in Fabrication
1. E beam Lithography
2. Inductively Coupled Plasma etching Process
3. Plasma Enhanced Chemical Vapor Deposition (PECVD)
4. E beam Evaporation
All about rings.
1. All pass microring resonator
2. Add Drop microring Resonator
The add drop microring resonator has two coupling coefficients called k1 and k2. It has also two transmission coefficients t1 and t2. When the coupling coefficient becomes equal to the losses in the ring resonator then that is called critical coupling coefficient. The critical coupling coefficient is considered as k1=a.k2 for add drop ring resonator.
There are multiple characteristic parameters in microring resonators which are given below.
1. Q factor
2. FWHM
3. Extinction Ratio
4. Finess
5. Coupling Coefficient.
The transfer function of add drop microring resonator is given below.
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