Development of optopackage at nikhef
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Development of optopackage at NIKHEF. Optical links session SCT week, 3 June 99. Fred Hartjes Contents Geometry Efficiency VCSEL to fibre coupling Pin diode Conclusions. Introduction. Intended as a simple solution for the forward system test Based on packaged elements.

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Development of optopackage at NIKHEF

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Development of optopackage at nikhef

Development of optopackage at NIKHEF

Optical links session SCT week, 3 June 99

Fred Hartjes

Contents

Geometry

Efficiency VCSEL to fibre coupling

Pin diode

Conclusions


Introduction

Introduction

  • Intended as a simple solution for the forward system test

  • Based on packaged elements

VCSEL in ‘miniature pill’ (SV 2637-001)

Pin diode HFD 3013 in TO46

(TO46 still too big)


Geometry considerations

Geometry considerations

  • Less mechanical protection required by using packaged elements

  • Fibres hold by crimped capillary pipe (Ø 0.5 mm).

  • Capillaries hold by polyester block (Arnite).

  • Electrical connection VCSEL’s and PIN diode by conductive glue

  • Alignment of VCSEL’s by adjusting VCSEL position while glue has not yet cured

  • => Rapid and non-critical assembly procedure expected for most steps

  • For forward system test: stripped PIN diode from TO 46 housing


Assembly opto plugin

Assembly opto plugin


Vcsel to fibre coupling

VCSEL to fibre coupling

  • sufficient for commercial receivers at forward system test (range 5 - 100 µW)

  • NOT sufficient for planned off detector opto receiver

  • Coupling efficiency 8.5%


Improvement by cutting vcsel lens

Lumunous power (P vs vertical fibre

position (Y) for partially removed VCSEL lens

300

fibre

250

Y

no lens cut

m

170

m

m

460

m

200

m

690

m

W)

m

m

690

m (d = 30

m)

m

P (

Emitter: SV 2637-001

Fibre: Newport 50/125/250

150

Detector: Radiantech FMT 220 ST

Emitter current: 10.0 mA

m

=> est. lum. power: 970

W

19-5-99

100

50

0

-50

0

50

100

150

m

Y (

m), arbitrary origin

Improvement by cutting VCSEL lens

Efficiency up to 30%

VCSEL


More improvement using focussing lens

More improvement using focussing lens

Efficiency over 40%


Power vs focussing

Power vs. focussing

  • 2 magnifications

    • 1

    • 0.64


Pin diode

Pin diode

  • TO46 case too big

  • using stripped diode: die + focussing sphere

    • die 620 x 660 µm

    • sphere Ø 570 µm


Conclusions remarks

Conclusions/ remarks

  • Design probably feasible for forward system test

  • For final SCT design

    • optical power small (300 uW using removed VCSEL lens

    • better with additional focussing lens ( > 400 µW from 1 mW optical power)

    • Drawbacks of focussing lens

      • more length of opto package

      • also alignment in Z critical

    • 3013 pin diode may be produced as a special in miniature pill or comparable housing for big quantities


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