We demonstrate an optically injection-locked self-oscillating optoelectronic mixer (OIL-SOM) for radio-on-fiber downlink applications. OIL-SOM is based on a monolithic oscillator containing an InP-InGaAs heterojunction phototransistor (HPT). The oscillator is OIL by remotely delivered optical local oscillator (LO) signals, and provides low phase-noise and high-power electrical LO signals. In addition, the HPT in this oscillator can simultaneously perform optoelectronic mixing, in which optically transmitted intermediate frequency signals are up-converted to the desired radio-frequency band with high conversion efficiency. With these, OIL-SOM can make base station architecture simple in radio-on-fiber downlink systems.
"oscillation even with a 10dB coupler for output at collector port. Although the oscillator is realized with discrete devices in this work, a single-chip oscillator can be easily realized with MMIC technology  . This free-running oscillator can be optically injection-locked by 30GHz optical LO delivered from the central office. "
[Show abstract][Hide abstract] ABSTRACT: A 30 GHz hybrid-type optically injection-locked self-oscillating optoelectronic mixer is implemented with a high-performance InP/InGaAs heterojunction photo-transistor. Using this mixer as a harmonic up-converter, 60 GHz radio-on-fiber downlink transmission of 20 Mbps 16QAM data is successfully demonstrated. The link performance is uniform over a wide range of optical LO powers.
Optical Fiber Communication Conference, 2006 and the 2006 National Fiber Optic Engineers Conference. OFC 2006; 04/2006
"For the applications requiring many base stations, this can be a problem since the amount of optical LO power that can be delivered from central office can be limited. One possible solution for this is using optically injection-locked self-oscillating optoelectronic mixers in base stations as we have demonstrated  because it can provide high electrical output LO power independent of input optical LO power. Fig. 5 shows the experimental setup for 60-GHz band RoF up-link transmission. "
[Show abstract][Hide abstract] ABSTRACT: We demonstrate 60-GHz band bidirectional radio-on-fiber (RoF) links based on InP-InGaAs heterojunction phototransistor (HPT) optoelectronic mixers. They employ remote up/down conversion scheme with optical local oscillator signals distributed from the central office and intermediate frequency (IF) fiber transmission for both up- and down-links. Since frequency up/down conversions and photodetection are carried out by a single HPT optoelectronic mixer, base station architecture is greatly simplified. In order to validate its feasibility, both up- and down-link RoF transmissions of 16 quadrature amplitude modulator data are successfully demonstrated at 60-GHz band using 1.25-GHz IF for down-link and 2.0-GHz IF for up-link.
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