Modes Effective Refractive Index Difference Measurement in Few-mode Optical Fiber

Zhang, Jing; Wu, Zhifang; Huang, Tianye; Shao, Xi; Shum, Ping

doi:10.1016/j.proeng.2015.08.1124

Cited by 3 publications

(1 citation statement)

References 7 publications

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“…The operational current in the architectural designs needs to be kept as low as possible in order to exceed the chirp frequency. But minimizing the chirp frequency also lowers the extinction rate of the modulator, which lowers the signalto-noise ratio [33].…”

Section: External Modulationmentioning

confidence: 99%

Summary on RoF Technologies, Modulations, and Optical Filters: Review

Obied,

Askar

2024

IJEEI

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In order to meet the growing need for bandwidth, this article offers a thorough examination of Radio over Fibre (RoF) technology and its integration with wireless communication networks. It starts out by going over the development of wireless networks and the difficulties they encounter, like spectral congestion and RF spectrum operational constraints. An effective way to handle data traffic is to include optical fibre into wireless networks. A detailed analysis is conducted of the technical features of RoF systems, including modulation approaches such as external and direct modulation. While external modulation provides better performance by getting around constraints, direct modulation uses the RF signal to directly modify the brightness of the light source. It is detailed how optical filters, including Fabry-Perot, Fiber-Bragg Grating, and Tunable filters, are used in a variety of applications. They provide an explanation of their functions and importance in optical communication. In addition, a thorough review of relevant literature is included in the study, along with a summary of the main conclusions, approaches, goals, drawbacks, and achievements of academic studies on optical communication and RoF systems. This analysis focuses on the field's problems and achievements. In summary, RoF technology integration of optical and wireless networks holds enormous potential to satisfy the changing needs of high-capacity, high-speed wireless communication. In order to effectively utilise the potential of RoF systems and progress contemporary wireless networks, additional study and development work is yet required.

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Section: External Modulationmentioning

confidence: 99%

Summary on RoF Technologies, Modulations, and Optical Filters: Review

Obied,

Askar

2024

IJEEI

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A novel micro-structured fiber for OAM mode and LP mode simultaneous transmission

Zhou

Chen

et al. 2018

J Opt

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Observing mode-dependent wavelength-to-time mapping in few-mode fibers using a single-photon detector array

et al. 2020

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Wavelength-to-time mapping (WTM)—stretching ultrashort optical pulses in a dispersive medium such that the instantaneous frequency becomes time-dependent—is usually performed using a single-mode fiber. In a number of applications, such as time-stretch imaging (TSI), the use of this single-mode fiber during WTM limits the achievable sampling rate and the imaging quality. Multimode fiber based WTM is a potential route to overcome this challenge and project a more diverse range of light patterns. Here, we demonstrate the use of a two-dimensional single-photon avalanche diode (SPAD) array to image, in a time-correlated single-photon counting (TCSPC) manner, the time- and wavelength-dependent arrival of different spatial modes in a few-mode fiber. We then use a TCSPC spectrometer with a one-dimensional SPAD array to record and calibrate the wavelength-dependent and mode-dependent WTM processes. The direct measurement of the WTM of the spatial modes opens a convenient route to estimate group velocity dispersion, differential mode delay, and the effective refractive index of different spatial modes. This is applicable to TSI and ultrafast optical imaging, as well as broader areas such as telecommunications.

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Modes Effective Refractive Index Difference Measurement in Few-mode Optical Fiber

Cited by 3 publications

References 7 publications

Summary on RoF Technologies, Modulations, and Optical Filters: Review

Summary on RoF Technologies, Modulations, and Optical Filters: Review

A novel micro-structured fiber for OAM mode and LP mode simultaneous transmission

Observing mode-dependent wavelength-to-time mapping in few-mode fibers using a single-photon detector array

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