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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, Amsterdam RD-51 MiniWeek, Sept 24, 2009. Phase modulation Transverse electric field Changes ε r (thus speed of light). + -. New optical link technology => Iflink.

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IfLink: a fast, light and rad-hard optical data connection HvdG, Nikhef, Amsterdam

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  1. IfLink: a fast, light and rad-hard optical data connection HvdG, Nikhef, Amsterdam RD-51 MiniWeek, Sept 24, 2009

  2. Phase modulation Transverse electric field Changes εr (thus speed of light) + -

  3. 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 εrby 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 Test setup modulator Laser (diode) Pixel chip Photo diode I.F. Thermal Graded Tipped Fiber Phase Modulator + mirror

  4. Litium Niobate (LiNbO3) Oriented crystal Radiation hard (CERN RD-23) New: thermally poled (quartz) fibers + -

  5. Very Unequal paths: Laser wavelength shifts causes phase shift Ultra stable laser required

  6. Path length tuning

  7. Final try: optical ‘twisted pairs Optical ‘Twisted Pair’ Dual Core fiber MZ InterFerence Length L Set-Up moved to Delft Univ. of Technology Results expected Oct 2009: - Phase noise as a function of length L?

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