Fig 1 - uploaded by A. Garcia-Juarez
Content may be subject to copyright.
Experimetal results. (a) Experimental setup, (b) Microwave signals between 4 and 5 GHz, (c) Reflected power of the CPW-fed G-shaped monopole antenna, (d) TV signals at 67.25MHz, transmitted and recovered.
Source publication
A wireless transmission system using a couple of CPW-fed G-shaped monopole antennas is reported in this paper. The microwave carrier is generated with a DFB laser biased in the low laser threshold current region.
Contexts in source publication
Context 1
... with the theoretical descriptions explained in [3], we have assembled in our laboratory the proposed experimental setup shown in figure 1(a). For the stage, where relaxation oscillation frequency were measured, we used a fiber coupled DFB laser source (Thorlabs, model S3FC1550) with a central wavelength of 1550 nm, a threshold current of 8 mA and a differential responsivity of 0.25 mW/mA. ...
Context 2
... that, the amplified optical signal was launched to a fast photodetector PD (MITEQ model DR-125G-A) which it has a typical optical to electrical transfer gain (V/W) of 1900, and -3dB bandwidth of 12.5GHz. Microwave signals located between 4 and 5 GHz were obtained when DFB laser it was tuned between 0.7 mW and 0.8mW with a temperature of 25º as shown in figure 1(b). The microwave carrier at the output of the photodetector was mixed with a TV signal by using an electrical frequency mixer (Mini-Circuits, model ZX05-U72MH-s+). ...
Context 3
... detected signal is amplified, filtered and synchronously down-converted to recuperate the analog TV signal of 67.25 MHz. The analog information was successfully transmitted from the transmitter to the receiver, and the received signal was satisfactorily reproduced at the receiver without noticeable degradation compared the original NTSC TV signal as shown in figure 1(d). ...
Similar publications
Citations
... The spectrum clearly shows the sidebands corresponding to the video signal. Next an amplifier (Mini-Circuits, model ZX60-14012L-S+) is used to obtain an appropriate power level for connecting a CPW-fed G-shaped monopole antenna with a bandwidth of 250 MHz at 4.5 GHz, which has a good match with the transmitter and the receiver between 4 and 5 GHz as reported in [27]. Finally the information is transmitted on an electrical carrier at 4.52 GHz using indoor wireless propagation in our laboratory, achieving a transmission distance of 1 m. ...
In this paper we propose a photonic architecture as an alternative tool to distribute point to multipoint analog and digital information over a hybrid wireless visible optical communication system. The experimental set-up is composed of a red laser pointer, an acousto-optic modulator, a sinusoidal grating and a photo-detector array. By using a simple and variable interferometric system, diffraction gratings with different spatial frequencies are generated and recorded on a photoemulsion which is composed of vanilla with dichromate gelatin. Analog video and digital information are first transmitted and recovered over a wireless communication system using a microwave carrier at 4.52 GHz which is generated by distributed feedback lasers operating in the low laser threshold current region. Separately, the recovered video information and digital data are combined with a radio frequency signal of 80 MHz, obtaining a subcarrier of information that is imposed on the optical carrier of the pointer laser using an acousto-optic modulator which is operated with an angle of incident light that satisfies the Bragg condition. The modulated optical carrier is sent to a sinusoidal grating, the diffraction pattern is photo-detected using an array of PIN photo-detectors. The use of sinusoidal gratings with acousto-optic modulators allows that number of channels to be increased when both components are placed in cascade.
