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IfLink: a fast, light, rad-hard, LVDS driven optical data connection

IfLink: a fast, light, rad-hard, LVDS driven optical data connection HvdG, Nikhef, Amsterdam RD-51 MiniWeek, Sept 24, 2009. Phase modulation Transverse electric field Pockels Effect Changes ε r (thus speed of light). + -. New optical link technology => Iflink.

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IfLink: a fast, light, rad-hard, LVDS driven optical data connection

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

  2. Phase modulation Transverse electric field Pockels Effect 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?

  8. IfLink • Unidirectional • modulator may have form factor of thin fiber along FE chip • little mass with respect to FE chip mass • little volume/surface required • LVDS (complimentary) drive Pockels Xtal parallel and anti-parallel • Little power (10 mW required for FE chip) • Radiation hard (LiNiobate: RD-23) • 10 – 40 Gb seems feasible • Direct optical connection to counting room: • Raw FE data to counting room • New LVL 1 triggers seem feasible

  9. To Do: Demonstrator • get (small fiber-like) LiNiobate Pockel Xtals • Pockels devices: get (a variety of) Thermally Poled (Quarz) Fibers • test phase noise of ‘dual core’ fiber: MZM 100 m long feasible? • Radiation Hardness tests of Pockel Devices • develop remote [quadrupole] [dark fringe] [bias] stabiliser • study (CMOS pixel) chip driver circuitry • Institutes: Nikhef Amsterdam • Techn. University Delft • ICFO Barcelona • RD-23 Revival?

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