1. Development of optopackage at NIKHEF Fred Hartjes Contents u Geometry uEfficiency VCSEL to fibre coupling uPin diode uConclusions Optical links session SCT week, 3 June 99

2. Fred Hartjes 2 Opto link session SCT week., 3 June 99 Introduction uIntended as a simple solution for the forward system test uBased on packaged elements VCSEL in ‘miniature pill’ (SV 2637-001) Pin diode HFD 3013 in TO46 (TO46 still too big)

3. Fred Hartjes 3 Opto link session SCT week., 3 June 99 Geometry considerations uLess mechanical protection required by using packaged elements uFibres hold by crimped capillary pipe (Ø 0.5 mm). uCapillaries hold by polyester block (Arnite). uElectrical connection VCSEL’s and PIN diode by conductive glue uAlignment of VCSEL’s by adjusting VCSEL position while glue has not yet cured u=> Rapid and non-critical assembly procedure expected for most steps uFor forward system test: stripped PIN diode from TO 46 housing

4. Fred Hartjes 4 Opto link session SCT week., 3 June 99 Assembly opto plugin

5. Fred Hartjes 5 Opto link session SCT week., 3 June 99 VCSEL to fibre coupling usufficient for commercial receivers at forward system test (range 5 - 100 µW) uNOT sufficient for planned off detector opto receiver uCoupling efficiency 8.5%

6. Fred Hartjes 6 Opto link session SCT week., 3 June 99 Improvement by cutting VCSEL lens VCSEL Efficiency up to 30%

7. Fred Hartjes 7 Opto link session SCT week., 3 June 99 More improvement using focussing lens Efficiency over 40%

8. Fred Hartjes 8 Opto link session SCT week., 3 June 99 Power vs. focussing u2 magnifications l1 l0.64

9. Fred Hartjes 9 Opto link session SCT week., 3 June 99 Pin diode uTO46 case too big uusing stripped diode: die + focussing sphere ldie 620 x 660 µm lsphere Ø 570 µm

10. Fred Hartjes 10 Opto link session SCT week., 3 June 99 Conclusions/ remarks uDesign probably feasible for forward system test uFor final SCT design loptical power small (300 uW using removed VCSEL lens lbetter with additional focussing lens ( > 400 µW from 1 mW optical power) lDrawbacks of focussing lens nmore length of opto package nalso alignment in Z critical l3013 pin diode may be produced as a special in miniature pill or comparable housing for big quantities