Performance of a free space optics subsystem boosted by SCM implementation

Coelho, Diogo; Coelho, Thiago V. N.; Giraldi, Maria Thereza Miranda Rocco; Pontes, Maria José; Segatto, Marcelo E. V.; Costa, João Crisóstomo Weyl Albuquerque

doi:10.1117/12.781584

Cited by 3 publications

(7 citation statements)

References 0 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In transmitting telescope, the convex lens is used to collimate and transfer the diverged parallel beam into the SLM that focuses it into a point on the photodiode. The SLM is based on liquid crystal silicon technology in which liquid crystal is controlled by a DC voltage [80]. The control voltage is chosen such as to obtain a minimum cross talk between the neighbouring channels to achieve possible high effective spatial resolution.…”

Section: Wavelength Division Multiplexing (Wdm)mentioning

confidence: 99%

“…The quality of the QAM-OFDM output signal of all the FSO channels can be captured by a communication signal analyser, i.e. OFDM analyser to carry out the online/offline analysis [73,80].…”

Section: Wavelength Division Multiplexing (Wdm)mentioning

confidence: 99%

“…In the FSO system, a more common modulation technique is intensity modulation with direct detection. In large bandwidth FSO data link, some other techniques utilising the full wavelength resources are needed to be employed [80,81]. A new modulation scheme employing the single/multiple wavelength SCM technique offers a high potential and high capacity system that considerably reduces the cost/bit.…”

Section: Sub-carrier Multiplexing (Scm)mentioning

confidence: 99%

See 2 more Smart Citations

Historical perspective of free space optical communications: from the early dates to today's developments

Raj

Majumder

2019

IET Communications

View full text Add to dashboard Cite

Section: Wavelength Division Multiplexing (Wdm)mentioning

confidence: 99%

“…The quality of the QAM-OFDM output signal of all the FSO channels can be captured by a communication signal analyser, i.e. OFDM analyser to carry out the online/offline analysis [73,80].…”

Section: Wavelength Division Multiplexing (Wdm)mentioning

confidence: 99%

Section: Sub-carrier Multiplexing (Scm)mentioning

confidence: 99%

See 1 more Smart Citation

Historical perspective of free space optical communications: from the early dates to today's developments

Raj

Majumder

2019

IET Communications

View full text Add to dashboard Cite

“…INTRODUCTION Nowadays, long period gratings (LPGs) has a growing importance in the fields of optical communications and fiber sensors technologies [1][2][3][4]. In single mode fibers, LPGs couple energy from the fundamental guided mode propagating in the core to different co-propagating symmetric cladding modes , satisfying the phase-matching equation [5]: (1) where is the differential propagation constant, is the grating period, and are the propagation constants for the fundamental and mth cladding modes, respectively.…”

mentioning

confidence: 99%

“…Also, they attenuate rapidly, due to large scattering losses at the cladding-air interface and bends in the fiber [7], and thus leave several attenuation bands centered at discrete resonant wavelengths ( ) in the transmission spectrum, obtained through the phase-matching condition and represented as [6]: (2) where is the effective refractive index of the fundamental core mode, is the effective refractive index of the mth cladding mode, and is the period of the LPG.…”

mentioning

confidence: 99%

Propagation Characteristics of Optical Long Period Fiber Gratings using Graphical Solution Methods

Delgado¹,

Jucá²,

Coelho³

et al. 2016

J. Microw. Optoelectron. Electromagn. Appl.

Self Cite

View full text Add to dashboard Cite

Abstract-In this paper, we explicitly show a complete analysis and detailed calculation of propagation characteristics of the effective refractive indices of the core and cladding for a long period grating employing both the Two-Layer and Three-Layer Geometries. The results are achieved employing graphical solution methods and presented in terms of the effective refractive indices of the core and cladding. Then, we compare the results with OptiGrating (Optiwave Systems Inc., Ottawa, Canada). Finally, we point the best model to evaluate the effective refractive indices, avoiding incorrect designs of the long period gratings.

show abstract

A Review–Unguided Optical Communications: Developments, Technology Evolution, and Challenges

et al. 2023

View full text Add to dashboard Cite

This review paper discusses the complete evolution of free-space optical (FSO) communication, also known as unguided optical communication (UOC) technologies, all the way back to ancient man’s fire to today’s machine-learning-supported UOC systems. The principles, significance, and developments that have happened over the past several decades, as well as installation methodologies, technological limitations, and today’s challenges of UOCs are presented. All the subsets of UOC: FSO communication, underwater optical wireless communication (UOWC), and visible light communication (VLC), with their technology/system developments, potential applications, and limitations are reviewed. The state-of-the-art developments/achievements in (i) FSO channel effects and their mitigation techniques; (ii) radio-over-FSO techniques; (iii) wavelength division multiplexing and sub-carrier multiplexing techniques; (iv) FSO for worldwide interoperability for microwave access applications; (v) space optical satellite communication (SOSC); (vi) UWOC; (vii) photoacoustic communication (PAC); (viii) light-fidelity; (ix) VLC; (x) vehicular VLC (V2LC); and (xi) optical camera communication are reviewed. In addition, the current developments on emerging technologies such as artificial intelligence (to improve the performance of UOC systems), energy harvesting (for the effective utilization of UOC channels), and near-future communication network scenarios (mandatory for secured broadband digital links) are covered. Finally, in brief, to achieve the full potential of UOC systems, challenges that require immediate research attention are summarized.

show abstract

Performance of a free space optics subsystem boosted by SCM implementation

Cited by 3 publications

References 0 publications

Historical perspective of free space optical communications: from the early dates to today's developments

Historical perspective of free space optical communications: from the early dates to today's developments

Propagation Characteristics of Optical Long Period Fiber Gratings using Graphical Solution Methods

A Review–Unguided Optical Communications: Developments, Technology Evolution, and Challenges

Contact Info

Product

Resources

About