High Speed Characterisation Platform

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High Speed Characterisation Platform

• Coordinator Benoît Clouet, Mathilde Gay, PERSYST
  (benoit.clouet_at_persyst.fr)
• CAM, CEA, COM, HHI, ORC, RWTH, CNRS-ENSSAT
  (PERSYST)

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Outline

• Rationale HSCP goals
• Involved partners
• Why the HSCP? Users, in the past and in the
  future
• How the HSCP? Who can use it, how to access to
  it, costs issues
• Platform portfolio which components, type of
  characterisations, examples

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Targets

• To provide high speed characterisations of
  devices
• Place high level test facilities / expertise at
  disposal for epixnet partners
• 2 test families physical and system
  characterizations
• Allow to validate devices at end user level
  pass the system tests, define the key parameters
• Help to improve the fabrication process

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Partners

• Multi-site platform with 7 partners (at the
  start)
• CNRS-ENSSAT (PERSYST)
• CAM
• CEA
• COM
• HHI
• ORC
• RWTH

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A unique infrastructure

• Some of the key actors in Europe in the
  telecommunications field share their test
  facilities to provide an integrated and very
  exhaustive test offer.
• Share cost-eating equipment and high-level
  expertise with a unique point of entry.
• Reference for component characterisation thanks
  to its independence.
• Redundancy allow cross-checked characterisation
  and good reactivity to the demand.

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Why the HSCP users in the past

• Before the HSCP was created, epixnet partners
  used the future HSCP facilities.
• A few examples
• High bit rate characterisations of micro-rings
  (HHI for university of Twente).
• Relative Intensity Noise measurements of QD
  lasers (CNRS-ENSSAT for INSA).
• Investigation of SOI nanowire photonic devices
  with sub-picosecond time resolution (RWTH for
  FAA5)

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Why the HSCP users in the future

• HSCP participations to JRA (years 3 and 4)
• JRA 4 study potential applications of short
  pulse sources at high bit rates (160 Gbit/s and
  above).
• JRA 6 characterisation of QD sources (RIN,
  phase noise measurements, system experiments at
  2.5, 10 and 40 Gbit/s).
• JRA 7 2R regenerators architectures assessment
  by a comparison of their performances in
  transmission experiments at 10 and 40 Gbit/s.

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Why the HSCP users in the future

• HSCP participations to JRA (years 3 and 4)
• JRA 9 assessment of silicon modulator
  performance at 10 and 40 Gbit/s.
• JRA 12 pump probe measurements on SOI
  nanophotonics devices.

Degraded eye diagram
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How the HSCP how to access it?

• A user willing to access the platform should
• either contact directly the platform coordinator
• or contact a member of the HSCP who will
  transfer the demand to the coordinator
• Access to the platform will be organised by the
  coordinator depending upon
• equipment availability
• HSCP partners interest for the test
• The coordinator may propose a round robin test.

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How the HSCP cost issue

• 2 situations
• test for scientific interest
• if an HSCP partner is interested scientifically
• only consumables and packaging to be paid for
• scientific publication may be pending
• test for pay
• lab hours to be paid for

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How the HSCP for who?

• The HSCP use is for now restricted to the
  epixnet community.
• Depending on the next 2 years, we will decide
  whether to open it to outside epixnet.
• If open to outside epixnet (decision during the
  course of years 3 and 4), it will probably be on
  a test for pay basis.

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Platform portfolio test offer

• Physical characterisations (some non exhaustive
  examples)
• Pump probe measurements (dynamic response, non
  linear behaviour,)
• Electro-optical characterisations (determination
  of the component bandwidth, )
• System characterisations
• Back-to-back measurements from 10 to 160 Gb/s
  (allow to check the performance)
• Transmission experiments from 10 to 160 Gb/s
  (some components need to be tested in cascade)

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Platform portfolio components

• The HSCP can characterise devices from chips to
  well finalised components.
• Components are characterised at user level
• Interaction with the component maker to adapt
  the device characteristics to the targeted
  application.
• Characterisation of unpackaged components
• Working with the packaging platform
• From fiber-chip coupling for physical
  characterisations,
• to more stable lab modules for system
  characterisations,
• and to RF packaging up to 40 GHz.

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Self pulsating laser
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Platform portfolio examples

• New JRA7 2R regenerators performance assessment
  in transmission experiment
• A path-switchable recirculating loop allows to
  study the impact of the regenerators place in a
  transmission line

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Platform portfolio examples

• Experimental results

Performance improvement versus regenerator span.
Performance improvement versus signal wavelength
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Platform portfolio examples

• Complete waveform characterisation
• Records a spectrogram of the crosscorrelation
  between the delayed EAM gate G(t-t) and the
  pulse E(t) to be measured
• Numerical processing of the spectrogram
• ? phase and intensity profiles of the pulse
• Very accurate (sub-ps pulse durations)
• Very sensitive (no nonlinearities)

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Platform portfolio examples

• Advantages of this system over conventional
  FROG
• Linear gating process, increased sensitivity
• All in fibre, no careful free space optics
  alignment needed
• High sensitivity measurement with an OSA,
  providing better spectral resolution
• Based on a crosscorrelation, so no temporal
  ambiguity

Characterisation of pulse compression systems
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Platform portfolio examples

• Previous JRA6 background timing jitter
  measurements for mode-locked lasers
• Direct detection
• of phase noise

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Platform portfolio examples

• Limitations with directly detected phase-noise
  measurements
• Oscillator noise
• Dynamic range (high noise floor of Spectrum
  Analyzer)
• Difficult to distinguish design variations!
• These are the first residual phase-noise
  measurements on 40-GHz mode-locked lasers!

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Platform portfolio examples

• Measurement of Relative Intensity Noise and
  frequency noise

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Platform portfolio examples

• Differential technique (reference source)
• 20 dB improvement compared to referenced
  technique
• -170 dB/Hz for 1 mW (0 dBm) detected power, with
  a precision of 0.5 dB/Hz
• 100 KHz-22 GHz

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High Speed Characterisation Platform

• Coordinator Benoît Clouet, Mathilde Gay, PERSYST
  (benoit.clouet_at_persyst.fr)
• CAM, CEA, COM, HHI, ORC, RWTH, CNRS-ENSSAT
  (PERSYST)