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There is a widespread acceptance that the flex-grid technology is the future of the transport network due to its astounding characteristics: flexible bandwidth allocation and reach tailoring through adaptive line rate, modulation formats, and spectral efficiency. However the number of variables to be optimized and the challenges to be overcome are enormous: routing, code and spectrum assignment; multi-domain...
A tandem dual electrode Mach Zehnder modulator (DE-MZM) generated W-band optical code division multiple access (OCDMA) radio-over-fiber (ROF) system is proposed and the simulation results are presented. We have investigated a method to upconvert a baseband laser signal to the millimeter wave band (W-band in this case) by utilizing two cascaded DE-MZMs driven by lower frequency sine-wave generators...
We propose unequal sideband intensity based modulation scheme called vestigial sideband scheme (VSB) for the radio over fiber system (RoF) using concatenated Mach-Zehnder modulator (MZM) and phase modulator (PM). This scheme can be generated with proper adjustment of the modulation indexes of the modulators. MZM-PM configuration can also be used for generating single sideband (SSB) and carrier suppressed...
Chip-scale frequency comb sources are likely to become key elements of future terabit/s optical transceivers. We investigate and demonstrate the viability of different comb generation schemes for transmission at multi-terabit/s data rates.
Next-generation WDM-PON solutions for metro and access systems will take advantage of remotely controlled wavelength-tunable ONUs to keep system costs as low as possible. For such a purpose, each ONU signal can be labeled by a pilot tone modulated onto the optical data stream. We report on the standardization status of this low-cost system in the new ITU-T G.metro draft recommendation, in the context...
Currently, the increase of output power of Yb-doped large mode area photonic crystal fiber lasers, fundamental for many practical industrial applications, is mainly limited by thermal effects, which negatively affect the beam properties. In this work the influence of the inner cladding characteristics on the guiding properties of Yb-doped symmetry-free photonic crystal fibers in different heating...
We present a detailed analysis of the nonlinearities occurring in the electro-optical (E/O) conversion of resonant cavity light-emitting diodes (RC-LEDs), which are typically used in optical short-range transmission. The analysis is focussed on the transfer characteristic between electrical modulation frequency at the RC-LED's input and the nonlinearities occurring in the optical output of the device...
We focus on a routing, spectrum, transceiver and regeneration allocation (RSTRA) problem in elastic optical networks (EONs). In the RSTRA optimization problem, in addition to classical RSA constraints, the assignment of transceivers to lightpaths and selection of regeneration sites is taken into account. Moreover, we assume a full flexibility of modulation and spectrum conversion in regeneration sites...
We report on recent progress in the field of visible light communications including direct modulation of blue laser devices at data rates beyond 10 Gbit/s, and the transmission of 2.5 Gbit/s OOK data through water. We also discuss the advantages of operating with single mode laser devices and matched filtering at the receiver in the context of applications with significant solar background. The system...
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