Alma Memo #440: Photonic Techniques for Local Oscillator Generation and Distribution in Millimeter-wave Radio Astronomy 10/31/2002
نویسندگان
چکیده
A number of photonics techniques are being used for Local Oscillator (LO) generation and distribution for millimeter-wavelength radio astronomy. Many of these are being implemented or considered for use on the Atacama Large Millimeter Array (ALMA) project.
منابع مشابه
Millimeter-Wave Photonic Techniques: Part I-Photonic Generation of Millimeter-Wave Signals
Broadband, low loss and cost-effective transmission capability of optical fiber links has led to an ever-increasing interest in their use for the generation and distribution of millimeter-wave (mm-wave) signals for broadband wireless access networks and sensor networks. In this paper, some new techniques in photonic generation of mm-wave signals for radio-over-fiber (RoF) network applications a...
متن کاملRf Photonic Vector Modulation and Demodulation Techniques for Millimeter-wave Communications
Title of dissertation: RF PHOTONIC VECTOR MODULATION AND DEMODULATION TECHNIQUES FOR MILLIMETER-WAVE COMMUNICATIONS Vincent R. Pagán, Doctor of Philosophy, 2015 Dissertation directed by: Professor Thomas E. Murphy Department of Electrical and Computer Engineering RF photonic techniques for modulating and demodulating microwave and millimeter-wave signals on RF carriers are theoretically analyze...
متن کاملALMA memo 435 A Hybrid Option for the First LOs using Direct Photonic LO Driver
We propose a hybrid option for the first local oscillators (LOs) of ALMA in which a direct photonic LO driver is used to drive cold multipliers. The photomixer using NTT uni-travelling carrier photodiode has been demonstrated to have high power of 2 m W at 100 GHz and low amplitude noise of < 7 − 17 K/μW in the frequency range of 98 − 105 GHz. This option simplifies the LO part of the cartridge...
متن کاملALMA Memo #443 ALMA LO Distribution Round Trip Phase Correction
The ALMA requires a coherent local oscillator at each antenna. Due to the long distribution length from central building to each of the antennas, the fiber optic path to each antenna must be stabilized to meet the ALMA specification. A round trip phase correction technique has been adopted to meet these specifications, and that technique is described here. Also, a summary of various techniques ...
متن کاملAdvanced Microwave/Millimeter-Wave Imaging Technology
Millimeter wave technology advances have made possible active and passive millimeter wave imaging for a variety of applications including advanced plasma diagnostics, radio astronomy, atmospheric radiometry, concealed weapon detection, all-weather aircraft landing, contraband goods detection, harbor navigation/surveillance in fog, highway traffic monitoring in fog, helicopter and automotive col...
متن کامل