Optical Cable Changeover Tool With Light Injection and Detection Technology

Hirota, Hidenobu; Kawano, Takeshi; Shimpo, M.; Noto, Kōshichi; Uematsu, Toshio; Honda, N.; Kiyokura, Takanori; Manabe, Tetsuya

doi:10.1109/jlt.2016.2568221

Cited by 11 publications

(6 citation statements)

References 10 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Color versions of one or more of the figures in this article are available online at http://ieeexplore.ieee.org time domain reflectometer (OTDR) [6], [11], [12]. The GRIN lens is designed to obtain a beam waist diameter of 25 m at a focal length of about 1 mm.…”

Section: Temperature Dependence Of Conventional Structurementioning

confidence: 99%

Temperature-Independent Temporary Optical Coupler Using Fiber Bending Technique

Uematsu

Hirota

Kawano

et al. 2023

J. Lightwave Technol.

View full text Add to dashboard Cite

This paper shows how to reduce the temperature dependence of a temporary optical coupler that enables us to output a signal light from a bent fiber by aligning a probe fiber in the path of the light leaked from the bent fiber and input a signal light from the probe fiber to the bent fiber. We experimentally demonstrate that the temperature dependence of the coupling efficiency between the bent and probe fibers is significantly improved by reducing the misalignment between these fibers created by temperature changes. First, we confirm by comparing calculation results to measured values that the temperature dependence of the conventional structure is caused by misalignment between the bent and probe fibers created by the difference in the thermal expansion of the components. Next, we demonstrate that the temperature dependence of the coupling efficiency is suppressed by using a structure that reduces the misalignment, and the proposed temperature-independent temporary optical coupler provides the coupling efficiency required to support its application over the wide temperature range of -10 to 50 degrees Celsius (equivalent to a fusion splicer) for fibers compliant with ITU-T G. 652 and G. 657.

show abstract

Section: Temperature Dependence Of Conventional Structurementioning

confidence: 99%

Temperature-Independent Temporary Optical Coupler Using Fiber Bending Technique

Uematsu

Hirota

Kawano

et al. 2023

J. Lightwave Technol.

View full text Add to dashboard Cite

show abstract

“…The clip-on coupler takes a portion of the signal transmitted via the tapped fiber and directs it through an additional optical fiber, where it can be connected to an eavesdropping device. The clip-on coupler exploits the fact that in a sharply bent optical fiber, part of the light goes outside the fiber [4], [5]. An example of a clip-on coupler is shown in Fig.…”

Section: Passive Attacksmentioning

confidence: 99%

The Threat of Optical Transmission Jamming

Kowalczyk,

Marzecki,

Siuzdak

2023

JTIT

View full text Add to dashboard Cite

In this paper, we investigate how data transmissions may be affected by various types of optical interference introduced into the fiber on purpose, via a clip-on coupler. The research proved that transmissions may be jammed completely using inexpensive equipment readily available on the market, provided that the attacker has physical access to the fiber optic cable. The most dangerous attacks rely on a typical, slowly modulated communication laser with a rectangular waveform. This study urges further research aimed at counteracting such attacks.

show abstract

“…Optical signals are input and output by setting the probe fiber in the path of light leaking from the fiber bend. We call this local light injection and detection [2]. Conventional optical-fiber identification is limited with regard to performance since it…”

Section: Local Light Injection and Detection Technologymentioning

confidence: 99%