Fiber Optics & Photonics Guides

Distributed temperature sensing (DTS) uses an optical fiber as a continuous temperature sensor. A DTS interrogator sends laser pulses into the fiber, analyzes temperature-sensitive backscatter and maps temperature against distance. The sensing cable must be selected for both measurement performance and the mechanical, thermal, pressure and chemical conditions of the installation. Quick answer: A DTS […]

ADSS fiber optic cable is an all-dielectric, self-supporting aerial cable used where optical fiber must cross poles or utility corridors without a separate messenger wire. Correct selection depends on span, environmental loading, electrical-field exposure, fiber count and installation tension—not fiber count alone. Quick answer: Specify an ADSS cable by route and structure conditions: nominal and

Fiber optic attenuation is the reduction of optical power as light travels through a fiber or passes through connectors, splices, bends and other components. It is expressed in decibels (dB), while the attenuation coefficient of the fiber itself is normally expressed in dB per kilometer (dB/km). Lower attenuation supports longer transmission distance and a larger

Optical fiber is made by first creating a high-purity glass preform whose core and cladding already contain the required refractive-index profile. The preform is then heated in a draw tower and pulled into a thin, continuous fiber. Diameter is controlled in real time, protective coatings are applied and cured, and the finished fiber is tested

Polarization extinction ratio (PER) is a key performance metric for polarization-maintaining fiber, pigtails, patch cords, laser systems, interferometers, and polarization-sensitive photonic components. Expressed in decibels, it compares optical power in the intended polarization axis with power that has coupled into the orthogonal axis. A higher PER generally indicates cleaner polarization separation—but a meaningful specification must

Polarization maintaining fiber (PM fiber or PMF) is a specialty optical fiber engineered to preserve the orientation of linearly polarized light. It is used when polarization stability directly affects measurement accuracy, signal quality, interferometric visibility, or laser performance. For buyers, the correct PM fiber is not selected by wavelength alone: fiber geometry, beat length, polarization

Photonic crystal fiber (PCF) is a microstructured optical fiber that uses a precisely arranged pattern of longitudinal air holes to control light guidance, dispersion, mode area, birefringence and nonlinear interaction. Depending on the core design, a PCF can guide light in solid silica through modified total internal reflection or in a hollow core through anti-resonant