An Analysis of Photobleaching Techniques for the Radiation Hardening of Fiber Optic Data Links

Sigel, George H.; Friebele, E. J.; Marrone, M. J.; Gingerich, M. E.

doi:10.1109/tns.1981.4335681

Cited by 25 publications

(6 citation statements)

References 16 publications

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“…Since the very first studies on the subject, it has been shown that PSC OFs are more sensitive to photobleaching than those having doped cores. [8,9] Also, it has recently been demonstrated that, for a commercial Ge-doped OF (Corning SMF-28), no photobleaching at all occurs at the telecommunication wavelengths even at MGy(SiO 2 ) dose levels (considering injected light powers made available by the current solid state laser technology). [10] Indeed, for doped-core OFs, the addition of dopants able to modify the refractive index of the OF (such as phosphorus, germanium, and others) has been observed to yield deeper, more stable traps which are not easily affected by the photobleaching process.…”

mentioning

confidence: 99%

Photobleaching Effect on the Radiation‐Induced Attenuation of an Ultralow Loss Optical Fiber at Telecommunication Wavelengths

Campanella

Morana

Michele

et al. 2021

Physica Status Solidi (a)

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Among the various advantages of optical fibers (OFs), low attenuation remains one of the most significant features, especially in the second and third telecom windows (around 0.5 and 0.2 dB km À1 ) at 1.31 and 1.55 μm wavelengths. [1] Ongoing studies are underway to limit as much as possible optical losses to overcome the limitations encountered in the design of telecommunication systems, to transfer information over longer distances (trans-oceanic transmission) without repeaters and/or signal regeneration. To date, the aforementioned attenuation limit, typically referring to commercial germanosilicate OFs (as the Corning SMF-28 and its latest enhanced versions) has been passed by a new generation of ultralow loss (ULL) OFs, whose core is composed essentially of pure silica (PSC-pure-silica core) with a low fluorine codoping. [2] With an appropriate and optimized manufacturing process, this new class of waveguides allows reducing the disorder in the microscopic glass structure and, as a result, the Rayleigh scattering losses that mostly explained the attenuation at Telecom windows. Losses as low as 0.14 dB km À1 at 1550 nm are today achieved. [2] When OFs are integrated in harsh environments associated with radiation constraints (e.g., space applications, fusiondevoted facilities, nuclear waste repositories), new sources of optical losses are added to the fiber intrinsic attenuation. In fact, radiations degrade the signal propagation inside the OF by generating radiation-induced point defects in the silica glass matrix. [3] These defects are associated with different absorption bands peaking in the ultraviolet, visible and infrared domains, reducing the silica transparency. This phenomenon, called radiation-induced attenuation (RIA), then logically depends on the OF intrinsic characteristics (chemical composition, geometry, and manufacturing process), on the environmental constraints (nature of particles, dose, dose rate, and temperature) as well as on the fiber profile of use (probing wavelength, signal power, and temperature). Indeed, all these parameters influence the defect generation efficiency or recovery processes through thermal or photo-assisted processes.From literature, it is known that PSC and F-doped OFs are, in terms of RIA, among the most radiation-resistant waveguides. [3,4] However, a new commercial ULL-PSC OF, the Corning Vascade EX1000, was recently found to be characterized by very high radiation-induced losses (up to a few dB m À1 after kGy dose levels) located in the infrared range of the spectrum. These losses were attributed to the presence of two overlapping absorption bands peaked around 1030 nm (%1.2 eV) and 1330 nm (%0.9 eV),

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mentioning

confidence: 99%

Photobleaching Effect on the Radiation‐Induced Attenuation of an Ultralow Loss Optical Fiber at Telecommunication Wavelengths

Campanella

Morana

Michele

et al. 2021

Physica Status Solidi (a)

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“…Removal of fibre transmission losses by photo-bleaching, which has been reported earlier [280], seems not to be effective for un-doped silica core fibres and has only a marginal effect on Ge-doped fibres in the wavelength region of lowest loss increase (800-1200 nm) [281].…”

Section: Radiation Induced Luminescence (Ril)mentioning

confidence: 78%

Diagnostics for steady state plasmas

Hartfuß¹,

König²,

Werner³

2006

Plasma Phys. Control. Fusion

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Problems related to the development of diagnostics for steady state fusion plasma experiments are being discussed. The paper concentrates on those necessities already appearing in nowadays non-burning plasma fusion experiments when extending pulse lengths beyond 10 s, i.e. thermal load, erosion, deposition, and long-time signal integration in magnetic diagnostics. Problems arising from high power ECRH under conditions of incomplete absorption are outlined. Individual standard diagnostic systems are discussed to identify their specific problems as well as the opportunities connected with long pulse operation. Burning plasma experiments characterized by intense n-and g-radiation are briefly reviewed for reasons of completeness, dealing with radiation induced processes in windows, fibres, cables, and mirrors. Methods of data handling, real time monitoring, and plasma control are outlined. Index

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“…Яркое проявление эффекта фотообесцвечивания можно увидеть в волокне с нелегированной кварцевой сердцевиной [8]. Исследовано влияние вводимой оптической мощности в волокно ОВ-РСИ125 на радиационно-наведенные потери, что крайне важно знать при эксплуатации таких световодов.…”

Section: влияние фотообесцвечиванияunclassified

Опыт Разработки Термостойкого, Радиационно-Стойкого И Водородостойкого Оптического Волокна В Пао Пнппк

Азанова¹,

Шевцов²,

Вохмянина³

et al. 2019

PhotonicsRussia

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Разработана технология изготовления, освоено серийное производство и проведены испытания оптического волокна с кварцевой сердцевиной стойкого к повышенным температурам, ионизирующему излучению и водородосодержащей среде. Такие оптические волокна могут быть использованы в кабелях для специальных систем телеметрии, бортовых кабелях авиакосмической техники, геофизических кабелях для измерения температуры в скважине.

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An Analysis of Photobleaching Techniques for the Radiation Hardening of Fiber Optic Data Links

Abstract: ABSTRACT

Cited by 25 publications

References 16 publications

Photobleaching Effect on the Radiation‐Induced Attenuation of an Ultralow Loss Optical Fiber at Telecommunication Wavelengths

Photobleaching Effect on the Radiation‐Induced Attenuation of an Ultralow Loss Optical Fiber at Telecommunication Wavelengths

Diagnostics for steady state plasmas

Опыт Разработки Термостойкого, Радиационно-Стойкого И Водородостойкого Оптического Волокна В Пао Пнппк

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