Abstract
A millimeter-wave radiometer using electro-optic modulation and photo-detection is presented. The millimeter-wave energy collected by the antenna is transferred to the sidebands of the optical carrier by an electro-optic modulator, and then transmitted through the optical fiber. Fiber Bragg grating filters are subsequently used to suppress the optical carrier and a photo-detector is used to detect the energy in the remaining sideband. The output signal of the photo-detector is detected by a lock-in amplifier to improve the sensitivity. The energy conversion efficiency and noise characteristics in the millimeter-wave signal processing are discussed. The millimeter-wave detection experiment based on this technique was implemented using a 50 GHz millimeter-wave source. The conversion efficiency and the noise equivalent power were measured. The methods for improving the sensitivity were proposed. A millimeter-wave radiometric detection system was designed. The detection experimental results show that this millimeter-wave signal processing method is effective for millimeter-wave radiometer.
| Original language | English |
|---|---|
| Pages (from-to) | 1018-1021 |
| Number of pages | 4 |
| Journal | Guangdianzi Jiguang/Journal of Optoelectronics Laser |
| Volume | 22 |
| Issue number | 7 |
| State | Published - Jul 2011 |
Keywords
- Electro-optic modulation
- Lock-in amplifier
- Microwave photonics
- Millimeter-wave radiometer
- Photo-detection
- Sensitivity
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