Title :
Design and realization of an optically controlled oscillator for radio over fiber at 5.2 GHz
Author :
Lecoy, Pierre ; Delacressonniere, Bruno
Author_Institution :
Equipe Circuits, ENSEA, Pontoise
Abstract :
We propose the design of a device directly converting an OOK (on-off keying) baseband optical signal from an optical fiber into a microwave carrier. It is based upon a microwave oscillator, using a silicon-germanium (SiGe) heterojunction phototransistor (HPT), realized in fully-integrated MMIC 0.35 mum technology. Simulations showed that the oscillation frequency is controlled by an optical illumination of the base-collector junction, increasing the junction capacitance, thus decreasing the oscillation frequency. A FSK (frequency shift keying) modulation is possible. If the frequency is locked by current injection from a reference oscillator, a PSK (phase shift keying) modulation becomes possible. First experimentations on the phototransistor confirmed these simulations
Keywords :
Ge-Si alloys; MMIC; amplitude shift keying; frequency shift keying; heterojunction bipolar transistors; microwave oscillators; microwave photonics; optical modulation; phase shift keying; phototransistors; radio-over-fibre; 5.2 GHz; FSK; OOK; PSK; Si-Ge; base-collector junction; current injection; frequency shift keying modulation; integrated MMIC technology; junction capacitance; microwave carrier; microwave oscillator; on-off keying baseband optical signal; optical fiber; optical illumination; optical network; optically controlled oscillator; phase shift keying modulation; radio over fiber; silicon-germanium heterojunction phototransistor; Frequency shift keying; Germanium silicon alloys; Microwave devices; Microwave oscillators; Optical control; Optical design; Phase shift keying; Phototransistors; Radio control; Silicon germanium; Radio over fiber; WLANs; digital modulations; photooscillator; phototransistor;
Conference_Titel :
Microwave Photonics, 2006. MWP '06. International Topical Meeting on
Conference_Location :
Grenoble
Print_ISBN :
1-4244-0203-4
Electronic_ISBN :
1-4244-0204-2
DOI :
10.1109/MWP.2006.346561
