Analogue optical data transfer for the CMS tracker

Hall, G.

doi:10.1016/s0168-9002(96)01107-2

Cited by 7 publications

(2 citation statements)

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“…Analogue signals from lo7 microstrip detector channels in the CMS tracker will be time-multiplexed (at 256: 1) and transmitted at 4OMsamples/s along 50000, lOOm long, optical links [2]. Several hundred digital optical links will also be used to pass timing and control signals to and from the tracker.…”

Section: Introductionmentioning

confidence: 99%

Radiation damage studies of optoelectronic components for the CMS tracker optical links

Gill

Arbet-Engels²,

Batten³

et al.

RADECS 97. Fourth European Conference on Radiation and Its Effects on Components and Systems (Cat. No.97TH8294)

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Optical links are being developed to transfer analogue tracking data and digital timing and control signals in the future Compact Muon Solenoid (CMS) experiment at CERN. The radiation environment inside the CMS tracker will be extreme, with hadron fluences up to -10i4/cm2 and ionising doses of -100kGy over the experimental lifetime. Prototype link elements, consisting of commercially available 13 lOnm multi-quantum-well InGaAsP lasers and InGaAs p-i-n photodiodes, have been irradiated in a fully packaged form with -6MeV neutrons to 10'5n/~m2, 24GeV protons to 4x10i4p/cm2 and '"Co-gammas to 100kGy. Three types of single-mode optical fiber, two pure-silica core and one Gedoped core, were irradiated in several stages with 6oCo-gammas to a total dose of -90kGy.Neutron and proton damage induced large increases in laser threshold and significant decreases in light output efficiency. P-i-n leakage current increased by up to 6-7 orders of magnitude for neutron and proton damage. P-i-n response was relatively unaffected until -2x 10'4n/cm2, or -4~1 0~~p / c m~, after which the photocurrent decreased rapidly. Gamma damage after lOOkGy was minor in comparison to hadron damage in both the lasers and p-i-n photodiodes. The radiation induced attenuation at 1300nm in the optical fibers was dependent upon the fiber type, with losses of O.OBdB/m for the pure-silica core fiber and 0.12dBIm in the Ge-doped core fiber, after -90kGy. The annealing in one of the pure-silica core fibers was found to be temporary in nature.

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Section: Introductionmentioning

confidence: 99%

Radiation damage studies of optoelectronic components for the CMS tracker optical links

Gill

Arbet-Engels²,

Batten³

et al.

RADECS 97. Fourth European Conference on Radiation and Its Effects on Components and Systems (Cat. No.97TH8294)

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“…Analog signals from 12x106 microstrip detector channels will be time-multiplexed (at 256: 1) and transmitted at 40MSamples/s (MS/s) along -50000, 1 OOm long, optical links [2]. A few thousand digital optical links will also be used to transfer timing and control signals to and from the tracker.…”

Section: Introductionmentioning

confidence: 99%

Development of radiation-hard optical links for the CMS tracker at CERN

Vasey

Arbet-Engels

Cervelli

et al. 1998

IEEE Trans. Nucl. Sci.

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A radiation-hard optical link is under development for readout and control of the tracking detector in the future CMS experiment at the CERN Large Hadron Collider.We present the optical system architecture based on edgeemitting InGaAsP laser-diode transmitters operating at a wavelength of 1.3pm, single mode fiber ribbons, multi-way connectors and InGaAs Pin photodiode receivers.We report on radiation hardness tests of lasers, photodiodes, fibers and connectors. Increases of laser threshold and pin leakage currents with hadron fluence have been observed together with decreases in laser slope-efficiency and photodiode responsivity. Short lengths of single-mode optical fiber and multi-way connectors have been found to be little affected by radiation damage.We analyze the analog and digital performance of prototype optical links transmitting data generated at a 40MSamples/s rate. Distortion, settling time, bandwidth, noise, dynamic range and bit-error-rate results are discussed.

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