The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
We demonstrate an optoelectronic oscillator (OEO) tunable from 15 to 20 GHz in which the optically carried microwave signal is generated by two distributed feedback (DFB) lasers on the same InP chip. Tunability is obtained by adjusting, thanks to the two bias currents, the optical frequency separation between the DFB laser tones. Phase noise reduction is obtained by combining optical self-injection...
A novel optical vector network analyzer (OVNA) system based on silicon-on-insulator integrated optical bandpass filter is presented, which improves measurement accuracy in both magnitude and phase responses due to higher resolution and sideband suppression ratio offered by the new OVNA system.
We investigate the use of an ultra-shallow partial etch to form silicon microring resonators with high Q in a 250nm thick SOI device layer, to enable narrowband filters for RF photonic signal processing in conventional silicon photonics platforms. We demonstrate compact ring resonators formed by waveguides with as shallow as 25nm deep etches in a 250nm device layer and show significant improvement...
New communication system for high-speed train passengers is required to provide broadband services in the train. Radio over fiber in millimeter wave band is considered to provide a high throughput of the system. As a proof of concept, we generate 92 GHz 200 M symbol/sec 64QAM signals by optical frequency doubler. EVM of the signal is 7.14%. The result shows 1.2Gbps transmission is available in MMW...
To simultaneously stabilize a series of terahertz (THz) source devices, we propose the use of optical combs as a frequency reference source. The optical combs provide a number of equally-spaced cw lights with high accuracy, so that it is suitable for generation of a series of frequency reference signals. To generate broadband optical combs, a combination of the Mach-Zehnder-modulator-based flat comb...
By the proposed algorithm with iterative methods, the post digital linearization technique converted the distorted RF signal into the linear one. Experimentally, more than 29dB suppression of IMD3 has been achieved and a spurious-free dynamic range increases from 104.1 to 128.8dB within a 1-Hz bandwidth.
We experimentally compared 60 GHz RoF fronthaul links employing DSB-SC and OSSB. OSSB link offers better receiver sensitivity (−5 dBm) for 8-Gbps 16-QAM signal at BER=2.3e−3, while DSB-SC link has a lower receiver sensitivity (2.6 dBm) requiring lower frequency LO and smaller bandwidth MZMs.
We use the RF analogue of electromagnetically induced transparency (EIT) to demonstrate a high resolution (22 MHz) integrated RF-photonic filter with an enhanced suppression (>30 dB) and an order-of-magnitude amplification in the group delay response. We implement the filter using low-power on-chip stimulated Brillouin scattering.
High dynamic range is a key requirement in advanced microwave photonic systems. We demonstrate compensation of nonlinearities occurring in microwave photonic links using a novel digital nonlinear equalization technique and demonstrate suppression of distortion products by 33 dB with a small number of equalizer coefficients.
We present a real-time single-channel 100-Gbit/s QPSK transmission using a photonics-based 300-GHz-band wireless link, which is the highest data rate ever reported by an analog coherent receiver without digital signal processing (DSP). For this, a new technique to stabilize a phase of 300-GHz-band carrier signal is proposed and successfully demonstrated.
We have been trying to develop photonic devices and sub-systems for radio-over-fiber based wireless mobile communication in dense-user environments. We report demonstrations of millimeter-wave wireless signal generation using optical 2-tone and its detection by use of array-antenna-electrode electrooptic modulators.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.