Fig 7 - uploaded by I. E. Zaldivar-Huerta
Content may be subject to copyright.
Source publication
A practical application of a bidirectional microwave photonic filter (MPF) to transmit simultaneous analog TV signals coded on microwave carriers is experimentally demonstrated. The frequency response of the bidirectional MPF is obtained by the interaction of an externally modulated multimode laser diode emitting at 1.55 mu m associated to the free...
Context in source publication
Context 1
... 6 displays the spectrum of the TV signal of 61.25 MHz transmitted and recovered, with a power level of −7.97 dBm (SNR ¼ 57.03 dB) and −20.23 dBm (SNR ¼ 44.77 dB), respectively. Figure 7 depicts the time-domain waveforms of standard NTSC obtained through an oscilloscope, where upper and lower traces correspond to the transmitted and recovered signals. ...
Citations
... The passband windows are generated utilizing an MPF that uses the spectrum characteristics of a multimode laser diode (MLD), the length, and the chromatic dispersion parameter of singlemode standard-fiber (SM-SF) [9]. To generate passband windows with photonic techniques is very attractive in optical communication systems because they can be used as electrical carriers to transmit the information as has been successfully demonstrated in [10]. In this work, the bandwidth of the passband windows is adjusted by filtering the optical spectrum of the MLD using tunable optical bandpass filters. ...
... In summary, we have proposed and mathematically analyzed a multiple passband microwave photonic filter with adjustable bandwidths. The main advantage of the scheme described in this paper is that the current architecture used to achieve these results is a very straightforward way to alter the MLD spectrum by adding two components to an already preexisting working topology of an MPF [9,10]. The underlying theory of the principle of operation was explained meticulously. ...
... Compared to other works, this proposal was achieved simultaneously for two passband microwave signals, and to the best of our knowledge this is the first time that this technique is proposed and experimentally demonstrated. In the past, the authors have successfully demonstrated the use of these microwaves filtered signals as electrical carriers to transmit analog signals [9,10]. However, the available electrical bandwidth was always a limitation. ...
We propose a straightforward technique that allows adjusting the bandwidth of microwave filtered signals by using two tunable optical bandpass filters. The principle of operation of the microwave photonic filter that allows the generation of passband windows is described by a full mathematical analysis. The electrical bandwidth of each generated passband window is adjusted by optically filtering a multimode laser diode. We demonstrate that the proposed filter can generate passband windows located at 4.87 GHz and 9.63 GHz exhibiting a bandwidth of 284.54 MHz and 391.24 MHz, respectively. The electrical bandwidth of each passband window can be increased to a maximum value of 1000 MHz by means of an adequate adjustment of the optical bandwidth from 2 nm to 10 nm approximately. A potential application of this proposal resides in the fact that the microwave filtered signals can be used as electrical carriers in optical communication schemes taking advantage of the electrical bandwidth that can be tailored according to a data transmission.
... It was noticeable that four well-formed band-pass windows were centered at f1 = 2. In the past, we have successfully demonstrated the robustness of this MPF scheme using the filtered band-pass windows as electrical carriers to transmit analog TV-signals [11,12]. Now, the objective of this work, as was initially established, was to use the band-pass windows centered at f1 = 2.1 GHz and f2 = 4.2 GHz as electric carriers to code digital signals. ...
This paper proposes and demonstrates the use of filtered microwave band-pass windows situated at 2.1 and 4.2 GHz as electrical carriers to transmit digital signals. The use of an appropriate microwave photonic filter (MPF) allows for the generation of the microwave band-pass windows. The key parameters of the filtering effect are the intermodal separation of a multimode laser diode (MLD), the chromatic dispersion parameter of the optical link, and its own length. Experimentally, it is demonstrated that the filtered band-pass windows can be used as electrical carriers to transmit digital signals at frequencies of 50, 100, and 150 MHz over 25.31 km of single-mode-standard-fiber (SM-SF). The quality Q-factor, jitter, and bit-error-rate are the parameters that allow for the evaluation of the quality of the digital signal transmission. The obtained results allow for the proposition of this photonic architecture in a passive optical network (PON) to distribute services like Internet Protocol (IP) telephony, internet, streaming video, and high definition television.
