scholarly journals A Reconfigurable Radio-Frequency Converter IC in 0.18 µm CMOS

Electronics ◽  
2019 ◽  
Vol 8 (10) ◽  
pp. 1146
Author(s):  
Carlos Sánchez-Azqueta ◽  
Erick Guerrero ◽  
Cecilia Gimeno ◽  
Santiago Celma
Keyword(s):  
Wavelength Division Multiplexing ◽  
Frequency Synthesizer ◽  
Frequency Converter ◽  
Impedance Matching ◽  
Cmos Process ◽  
Wavelength Division ◽  
Triple Play ◽  
Band Pass ◽  
Reconfigurable Radio ◽  
Lc Tank

This work presents a reconfigurable RF converter for DVB-T television applications using triple-play over GPON. The system takes the DVB-T input, a wavelength division multiplexing (WDM) signal with spectral inversion in the range from 47 M Hz –1000 M Hz , up-converts its frequency to the band-pass of a highly selective surface-acoustic wave (SAW) filter centered at 1 . 3 G Hz , and then down-converts it so that it is compatible with the antenna input of conventional television sets. The designed RF converter incorporates two pairs of frequency synthesizer and mixer, based, respectively, on an integer-N phase-locked loop (PLL) with two LC-tank VCOs with 128 coarse tuning bands in the range from 1.35 G Hz –2.7 G Hz , and a double-balanced Gilbert cell, modified for better impedance matching and improved linearity. It is fed with regulated supplies compensated in temperature and programmed by an I 2 C interface operating on five 16-bit registers. This work presents the experimental characterization of the whole system plus selected cells for stand-alone testing, which have been fabricated in a 0 . 18 m CMOS process.

scholarly journals A Tunable Wideband Frequency Synthesizer Using LC-VCO and Mixer for Reconfigurable Radio Transceivers

2011 ◽  
Vol 2011 ◽  
pp. 1-7 ◽  
Author(s):  
Yusaku Ito ◽  
Kenichi Okada ◽  
Kazuya Masu
Keyword(s):  
Tuning Range ◽  
Frequency Synthesizer ◽  
Frequency Tuning ◽  
Cmos Process ◽  
Voltage Controlled Oscillator ◽  
Chip Area ◽  
Variable Gain ◽  
Continuous Frequency ◽  
Reconfigurable Radio ◽  
Lc Vco

This paper proposes a novel wideband LC-based voltage-controlled oscillator (VCO) for multistandard transceivers. The proposed VCO has a core LC-VCO and a tuning-range extension circuit, which consists of switches, a mixer, dividers, and variable gain combiners with a spurious rejection technique. The experimental results exhibit 0.98 to 6.6 GHz continuous frequency tuning with −206 dBc/Hz of FoMT, which is fabricated by using a 0.18 μm CMOS process. The frequency tuning range (FTR) is 149%, and the chip area is 800 μm × 540 μm.

scholarly journals Effects of Modulation Techniques (Manchester Code, NRZ or RZ) on the Operation of Hybrid WDM/TDM Passive Optical Networks

2014 ◽  
Vol 2014 ◽  
pp. 1-8
Author(s):  
Kumbirayi Nyachionjeka ◽  
Wellington Makondo
Keyword(s):  
Optical Networks ◽  
Wavelength Division Multiplexing ◽  
Optical Network ◽  
Passive Optical Network ◽  
Modulation Formats ◽  
Wavelength Division ◽  
Modulation Format ◽  
Triple Play ◽  
Triple Play Services ◽  
Time Division

In this paper, the performance and feasibility of a hybrid wavelength division multiplexing/time division multiplexing passive optical network (WDM/TDM PON) system with 128 optical network units (ONUs) is analysed. In this system, triple play services (video, voice and data) are successfully communicated through a distance of up to 28 km. Moreover, we analysed and compared the performance of various modulation formats for different distances in the proposed hybrid WDM/TDM PON. NRZ rectangular emerged as the most appropriate modulation format for triple play transmission in the proposed hybrid PON.

Wavelength Division Multiplexing and Demultiplexing using Photonic Crystal Multi Channel Add Drop Filter: A Review

2016 ◽  
Vol 5 (4) ◽  
pp. 29
Author(s):  
BHADRA ANAMIKA ◽  
SAHU VIKAS ◽  
SHRIVASTAVA SHARAD MOHAN ◽  
ANSHU ◽  
SANGHVI ANJALI S. ◽  
...  
Keyword(s):  
Photonic Crystal ◽  
Wavelength Division Multiplexing ◽  
Wavelength Division

scholarly journals Peta-bit-per-second optical communications system using a standard cladding diameter 15-mode fiber

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
Georg Rademacher ◽  
Benjamin J. Puttnam ◽  
Ruben S. Luís ◽  
Tobias A. Eriksson ◽  
Nicolas K. Fontaine ◽  
...  
Keyword(s):  
Wavelength Division Multiplexing ◽  
Single Mode ◽  
Single Mode Fiber ◽  
Capacity Limits ◽  
Wavelength Division ◽  
Core Networks ◽  
Space Division Multiplexing ◽  
Space Division ◽  
Data Rates ◽  
Multi Mode

AbstractData rates in optical fiber networks have increased exponentially over the past decades and core-networks are expected to operate in the peta-bit-per-second regime by 2030. As current single-mode fiber-based transmission systems are reaching their capacity limits, space-division multiplexing has been investigated as a means to increase the per-fiber capacity. Of all space-division multiplexing fibers proposed to date, multi-mode fibers have the highest spatial channel density, as signals traveling in orthogonal fiber modes share the same fiber-core. By combining a high mode-count multi-mode fiber with wideband wavelength-division multiplexing, we report a peta-bit-per-second class transmission demonstration in multi-mode fibers. This was enabled by combining three key technologies: a wideband optical comb-based transmitter to generate highly spectral efficient 64-quadrature-amplitude modulated signals between 1528 nm and 1610 nm wavelength, a broadband mode-multiplexer, based on multi-plane light conversion, and a 15-mode multi-mode fiber with optimized transmission characteristics for wideband operation.

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