Formation of hard very-high energy spectra of blazars in ...
IfLink: a fast, light and rad-hard optical data connection HvdG, Nikhef, Amsterdam
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a fast, light and rad-hard optical data con HvdG, Nikhef, Amsterdam RD-51 MiniWeek, Sept 24, 2009
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IfLink: a fast, light and rad-hard optical data connection HvdG, Nikhef, Amsterdam RD-51 MiniWeek, Sept 24, 2009. Phase modulation Transverse electric field Changes ε r (thus speed of light). + -. New optical link technology => Iflink. - PowerPoint PPT Presentation
Transcript of IfLink: a fast, light and rad-hard optical data connection HvdG, Nikhef, Amsterdam
IfLink: a fast, light and rad-hard optical data connection
HvdG, Nikhef, AmsterdamRD-51 MiniWeek, Sept 24, 2009
Phase modulationTransverse electric fieldChanges εr (thus speed of light)
+ -
New optical link technology => Iflink
• Present VCSEL technology not sufficient rad hard (1.5 1015 cm-2 neq ) for B-layer
• Alternative => Iflink– Using Pockels effect: change of εr by transverse E field
– Thermally poled electro-optic active fibre (quartz)– => possibly sufficiently rad-hard for B-layer
• Low modulator mass– TU-Delft (Neth.) and ACREO (Sweden) involved
Laser (diode)
Photo diodeI.F.
Thermal Graded Tipped FiberPhase Modulator+ mirror
Pixel chipTest setup modulator
Litium Niobate (LiNbO3)Oriented crystalRadiation hard (CERN RD-23)
+ -
New: thermally poled (quartz) fibers
Very Unequal paths:Laser wavelength shifts causes phase shiftUltra stable laser required
Path length tuning
Final try: optical ‘twisted pairs
MZInterFerence
Optical ‘Twisted Pair’Dual Core fiber
Length L
Set-Up moved to Delft Univ. of TechnologyResults expected Oct 2009:- Phase noise as a function of length L?
