Analog photonic link by using DFB lasers operated in the low laser threshold current region and external modulation

García-Juárez, A.; Zaldívar-Huerta, I. E.; Rodrı́guez-Asomoza, J.; Gómez-Colín, R.; Rojas-Hernández, A. G.; Mendoza, D.; Gómez-Fuentes, R.; Vera-Marquina, A.

doi:10.1117/12.909148

Cited by 3 publications

(3 citation statements)

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“…In the first stage of the system, microwave signals are generated between 4 and 5 GHz using a distributed feedback (DFB-1) laser diode operating in the low laser threshold current region and the direct detection method, as is described in [24][25][26]. With this optoelectronic technique, first the DFB-1 laser source (Thorlabs, model S3FC1550) is biased using an injection current at 12 mA, then the optical beam is launched to an optical isolator (OI) to avoid back reflections that can destabilize the laser source.…”

Section: Distribution Of Analog Videomentioning

confidence: 99%

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

Colin

García-Juárez

Zaldívar-Huerta

et al. 2016

J. Opt.

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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.

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Section: Distribution Of Analog Videomentioning

confidence: 99%

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

Colin

García-Juárez

Zaldívar-Huerta

et al. 2016

J. Opt.

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“…The frequencies of the radio signals distributed by RoF systems span a wide range (usually in the GHz region), and the applications for such systems range from in-building distribution of wireless signals (for example, in shopping malls and tunnels), wireline interconnections between base stations and microcellular antennas, antenna remoting for various commercial (wing-tip antennas in aircraft) and military radar systems, and broadcasting of cable television signals in both hybrid fiber coax (HFC) and triplexer based fiber-to-thehome (FTTH) systems. 8 The operation principle of direct detection is given in Sec. 5 The fiber chromatic dispersion intrinsically occurring in standard 1550-nm single-mode fibers (SMFs) is one of the main drawbacks that limit the transmission distance and operation bandwidth of such RF fiber-optic systems.…”

Section: Introductionmentioning

confidence: 99%

Method to transmit analog information by using a long distance photonic link with distributed feedback lasers biased in the low laser threshold current region

et al. 2012

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We describe an analog microwave photonic link system, which is used to transmit in a multiplexed way a TV signal over 30 km of standard optical fiber. The experimental setup is composed mainly by two distributed feedback (DFB) laser diodes emitting at 1500 nm. When these DFB lasers are operated in the low laser threshold current region, relaxation oscillation frequencies are obtained. Relaxation oscillations in the laser intensity can be seen as sidebands on both sides of the main laser line. The optical emissions generated in each laser are combined and amplified by using an erbium-doped fiber amplifier. Next, the amplified optical signal is detected by a fast photo-detector using direct detection method, and as result of this photo-detection, microwave signals are generated. Since microwave signals obtained by using this technique are tuned continuously; we can use them as electrical carriers to transmit simultaneously a TV signal at 4 and 5 GHz and over 30 km of standard optical fiber by using a Mach-Zehnder modulator. At the end of the optical link the modulated light is photo-detected in order to recover efficiently and successfully the analog TV signal.

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“…In this case the electric field emitted by the laser diode can be represented as a directly modulated optical signal. After passing through an optical fiber, the optical field incident on the PD can be expressed as [36,37] …”

Section: Operation Principle Of Direct Detectionmentioning

confidence: 99%

Photonic Components for Analog Fiber Links

García-Juárez¹,

Zaldívar-Huerta²,

Rodrı́guez-Asomoza³

et al. 2012

Optical Communication

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Analog photonic link by using DFB lasers operated in the low laser threshold current region and external modulation

Cited by 3 publications

References 0 publications

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

An experimental distribution of analog and digital information in a hybrid wireless visible light communication system based on acousto-optic modulation and sinusoidal gratings

Method to transmit analog information by using a long distance photonic link with distributed feedback lasers biased in the low laser threshold current region

Photonic Components for Analog Fiber Links

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