THINKING DIFFERENT OPTICAL COMMUNICATIONS SYSTEMS THANKS TO SILICON PHOTONICS Silvio Abrate Nice | 30 June 2016
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THINKING DIFFERENT OPTICAL
COMMUNICATIONS SYSTEMS
THANKS TO SILICON
PHOTONICS
Silvio Abrate
Nice | 30 June 2016
30° June 2016 2 Copyright © 2016 ISMB
WHAT DOES IT MEAN PHOTONIC INTEGRATION?
TO ME, PHOTONIC INTEGRATION IS NOT ONLY INTEGRATING SEVERAL
FUNCTIONS INTO ONE SINGLE DEVICE, IT IS NOT ONLY REPLACING
SEMICONDUCTOR COMPONENTS WITH SILICON COMPONENTS
TO ME PHOTONIC INTEGRATION ALSO MEANS THINKING SISTEMS AND DEVICES
SINERGICALLY, TAYLORING DEVICES ON SYSTEMS BUT ALSO SYSTEMS ON THE
TECHNOLOGY
30° June 2016 3 Copyright © 2016 ISMB
AN EXAMPLE
TO ME, PHOTONIC INTEGRATION IS NOT ONLY INTEGRATING SEVERAL
FUNCTIONS INTO ONE SINGLE DEVICE, IT IS NOT ONLY REPLACING
SEMICONDUCTOR COMPONENTS WITH SILICON COMPONENTS
WE DON’T WANT OPTICAL SOURCES AT THE CUSTOMER PREMISES
REFLECTIVE NETWORKS
λ1
λ2 λ1 CW
λ2 DS
λ1 CW λ2 DS +
λ1 US
CO CUSTOMER
30° June 2016 4 Copyright © 2016 ISMB
IN THE FIELD OF PASSIVE OPTICAL NETWORKS
Most of WDM complexity and cost
(tunable laser) left at the OLT
No uncontrolled wavelengths
at ONU switch-on
PROs
HERE COMES THE SILICON!
Challenging power budget:
coherent detection at the OLT, much
DSP (long FEC, equalizers, etc.)
Modulator and tunable optical
filter at the ONU
CONs
Modulator and tunable optical
filter at the ONU
TELECOM
30° June 2016 5 Copyright © 2016 ISMB
FROM THE FABULOUS EU PROJECT
Reflective WDM PON based on FDM / FDMA
30° June 2016 6 Copyright © 2016 ISMB
… SUMMARIZING ...
The ONU reflects the seed signal, modulates it and performs
90° polarization rotation Purpose of the project is to integrate the ONU on a Silicon
Photonics PIC
30° June 2016 7 Copyright © 2016 ISMB
… SUMMARIZING
Polarization rotation allows simplified coherent detection at the OLT
30° June 2016 8 Copyright © 2016 ISMB
WITH DISCRETE COMPONENTS
30° June 2016 9 Copyright © 2016 ISMB
BENCHMARKING WITH DISCRETE COMPONENTS
Number of ONUs
Bit-rate per ONU Maximum ODN loss
Theoretical splitter insertion
loss
Optical margin
32 4 Gb/s 27 dB 15 dB 12 dB
64 2 Gb/s 28 dB 18 dB 10 dB
128 1 Gb/s 31 dB (Class N2) 21 dB 10 dB
Number of ONUs
Bit-rate per ONU Maximum ODN loss
Theoretical splitter insertion
loss
Optical margin
128 375 Mb/s 37 dB (Class E2) 21 dB 16 dB
256 187.5 Mb/s 38 dB (Class E2) 24 dB 14 dB
512 93.75 Mb/s 39 dB (Class E2) 27 dB 12 dB
4 wavelengths @32 Gbps
4 wavelengths @10 Gbps
30° June 2016 10 Copyright © 2016 ISMB
THE SILICON DEVICE
InP over Si enables amplification in PIC:
fundamental for complex functions
30° June 2016 11 Copyright © 2016 ISMB
IS IT LOW COST?
About 100$
(80% due to packaging)
Considering:
>1.000.000 pieces/year
the size of the SiP chip, the SOA, the driver
commercial FDM IC
30° June 2016 12 Copyright © 2016 ISMB
WITH THE FIRST RELEASE OF THE INTEGRATED ONU
About 100$
(80% due to packaging)
20 21 22 23 24 2510
-6
10-5
10-4
10-3
10-2
10-1
ODNLOSS
[dB]
BE
RDATACOM
30° June 2016 13 Copyright © 2016 ISMB
WHAT ABOUT INTERCONNECTS?
• As there is no users multiplexing, there is no saving on the
number of lasers using a reflective architecture with
different wavelengths.
INTERCONNECT
• What about re-modulating one only wavelengths with two
different signals?
30° June 2016 14 Copyright © 2016 ISMB
AN EXAMPLE OF POSSIBLE ARCHITECTURES
• Reflective: one fiber
30° June 2016 15 Copyright © 2016 ISMB
AN EXAMPLE OF POSSIBLE ARCHITECTURES
• Folded: a fiber pair
30° June 2016 16 Copyright © 2016 ISMB
PRELIMINARY RESULTS WITH DISCRETE COMPONENTS
sim_scheme2_2mzm_pbs_pres: Eye Diagram at b2207080, scope3, Run 1
0 0.02 0.04 0.06 0.08 0.1 0.12 0.14 0.16
0
5e-008
1e-007
1.5e-007
2e-007
2.5e-007
3e-007
Time [ns]
[a.u.]
30° June 2016 17 Copyright © 2016 ISMB
LESSONS LEARNED
we co-develop systems
and components:
it is not only substituting
and integrating
we lower packaging
costs
we can rely on
amplification in the PIC;
hybrid integration seems
an efficient way
Let’s wait for the silicon laser!
SiP can definitely benefit optical networks provided that:
SILVIO ABRATE
Head of Applied Photonics
Istituto Superiore Mario Boella
Via Pier Carlo Boggio, 61
10138 Torino, Italia
T. +39 011 2276302
CONTACTS
www.ismb.it
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