Fig. 1. Schematics of OSSB modulation. (a) Carrier-suppressed OSSB modulation; (b) full carrier OSSB modulation

Fig. 2. Classification of OSSB modulation methods

Fig. 3. OSSB modulation system based on FBG filtering method

Fig. 4. Microring resonators. (a) Schematic diagram of all-pass microring resonator; (b) schematic diagram of add-drop microring resonator; (c) transmission line of through port of all-pass microring resonator; (d) transmission line of add-drop microring resonator

Fig. 5. Integrated RAMZI optical filter^[36]. (a) Diagram of RAMZI filter; (b) ideal magnitude response and simulated response; (c) phase response; (d) experimental diagram for determining optimum bias point of DDMZM; (e) dependence of OCSR on bias voltage; (f) relationship between OCSR and modulation frequency

Fig. 6. Electro-optic frequency shifter and beam splitter^[39]. (a) Microscopy image of dual-ring filter; (b) up-converted spectrum; (c) down-converted spectrum; (d) microscopy image of cascade microring; (e) output spectrum of cascaded microring

Fig. 7. Block diagram of OSSB modulation principle based on DDMZM with 90° coupler

Fig. 8. Principle diagram of 60 GHz OSSB mm-wave generation scheme^[57]

Fig. 9. Block diagram of OSSB modulation principle based on IQ modulator

Fig. 10. Thin-film lithium niobate-based IQ modulator^[66]. (a) Structure; (b) microscope image; (c) electro-optic characteristic; (d) electro-optic bandwidth

Fig. 11. Ultrafast optical Serrodyne frequency shifting via self-phase modulation in MPC^[19]

Fig. 12. OSSB modulation based on SBS

Fig. 13. Schematic diagram of OSSB signal generation principle based on Sagnac interferometry

Fig. 14. Schematics of OSSB modulation solutions based on EML. (a) Parallel type; (b) series type; (c) dual-modulation type

Fig. 15. Applications of OSSB modulation