FDMA Access By Using Lowcost Optical network Units in Silicon photonics Project outcomes and lessons learned July 2017 SOME THOUGHTS ABOUT SILICON PHOTONICS What do silicon manufacturers think about silicon photonics ID: 539851
Download Presentation The PPT/PDF document "FABULOUS" is the property of its rightful owner. Permission is granted to download and print the materials on this web site for personal, non-commercial use only, and to display it on your personal computer provided you do not modify the materials and that you retain all copyright notices contained in the materials. By downloading content from our website, you accept the terms of this agreement.
Slide1
FABULOUS
FDMA Access By Using Low-cost Optical network Units in Silicon photonics. Project outcomes and lessons learned.
July 2017Slide2
SOME THOUGHTS ABOUT SILICON PHOTONICS
What do silicon manufacturers think about silicon photonics?
Silicon Photonics is great, I can give you any component you like, just ask me millions pieces per year!
What do silicon manufacturers think about silicon photonics?
Silicon Photonics is great, I can give you any component you like, just ask me
millions pieces
per year!
What do system manufacturers think about silicon photonics?
It’s cheap and I like it, as long as it doesn’t change my whole system
What do system manufacturers think about silicon photonics?
It’s
cheap
and I like it, as long as it doesn’t change my whole system
CHEAP
MILLIONS PIECESSlide3
LONG-HAUL
: high-bit rates, expensive devices, non million pieces per
year not the best entrance market
DATACOM
TELECOM
FTTx
: already millions of customers for EPON, GPON, XGPON
a good potential for silicon
INTERCONNECT
LET’S FOCUS ON OPTICAL TELECOMSlide4
Two types of services
P2P-WDM: dedicated
wavelengths
used
for high-capacity links,
eg
.
for
4G or 5G BTS
TWDM-PON: 4
wavelengths
(in
first releases) to transport TDM services with an aggregate capacity of 10 Gbps DS and 2,5 Gbps US per wavelength
The PON infrastructure is the same of XGPON, the wavelength plan has to be compatible with GPON, XGPON, RF-video
The first PON standard to rely on DWDM
THE NEW PON STANDARD: G.989Slide5
Low-cost
tunable
lasers (for the ONU)
are still an open issue.
No room for
SiP
optoelectronic devices
(
SiP
not mature for sources).
TDM: in its timeslot, the user has to go
max speed (10 Gbps DS, 2,5 Gbps US).
Most of the electronic is ready but it has
to be fast.
IS G.989 SUITABLE FOR LOW-COST CPE?Slide6
THE FABULOUS EU PROJECTSlide7
EU STREP contract 318704
7
FABULOUS AT-A-GLANCE
4,3M€
TOTAL COST
2,9M€
FROM THE EU
1
st
October
2012
PROJECT START
36+9
months
DURATIONSlide8
WE DON’T WANT OPTICAL SOURCES AT THE ONU
REFLECTIVE PON
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
Modulator and
tunable
optical
filter
at
the ONU
CONs
Modulator and
tunable
optical
filter at the ONU
LET’S RETHINK NG-PON2 FROM SCRATCHSlide9
WE WANT THE ONU ELECTRONICS TO RUN
AT THE USERS’ BAUD RATE
FREQUENCY DIVISION MULTIPLEXING
Continuous data-stream
Long FEC, M-QAM and DSP easier to use
with respect to burst-mode systems
PROs
Many degrees of freedom for bit-rate adaption
on per-user basis
Linear optoelectronics needed
DAC and ADC
CONs
Frequency
mixers
LET’S RETHINK NG-PON2 FROM SCRATCHSlide10
Reflective WDM PON based on FDM / FDMA
SUMMARIZING…Slide11
The ONU
reflects
the seed signal, modulates itand performs 90° polarization rotation
Purpose
of the
project
is
also
to integrate the ONU on a
Silicon
Photonics PIC
…SUMMARIZING…Slide12
Polarization rotation allows simplified coherent detection at the OLT
…SUMMARIZINGSlide13
WITH DISCRETE COMPONENTSSlide14
1
wavelength
Modulation format
Electrical bandwidth per channel
Net bit-rate per user
Maximum ODN loss
64-QAM660 MHz3 Gbps
23.0 dB64-QAM
1320 MHz
6 Gbps23.0 dB
16-QAM
330 MHz
1 Gbps31.0 dB16-QAM1650 MHz5 Gbps30.5 dB16-QAM3300 MHz10 Gbps
28.0 dBQPSK66 MHz
100 Mbps41.0 dB
QPSK330 MHz500 Mbps
38.0 dB
QPSK
1650 MHz
2.5
Gbps
34.5 dB
QPSK
3300 MHz
5 Gbps
32.5 dB
BPSK
330 MHz
250 Mbps
40.5 dB
OOK
6250 MHz
10 Gbps
38.5 dB
~11GHz of modulator bandwidth
BENCHMARKING WITH DISCRETE COMPONENTSSlide15
Number of ONUs
Bit-rate per ONUMaximum ODN lossTheoretical splitter insertion lossOptical margin324 Gb/s
27 dB15 dB12 dB642 Gb/s28 dB
18 dB
10 dB
1281 Gb/s
31 dB (Class N2)21 dB
10 dB
Number of ONUs
Bit-rate per ONU
Maximum ODN loss
Theoretical splitter insertion lossOptical margin
128375 Mb/s37 dB (Class E2)21 dB16 dB256187.5 Mb/s38 dB (Class E2)24 dB14 dB
51293.75 Mb/s
39 dB (Class E2)27 dB
12 dB
4 wavelengths @32 Gbps
4 wavelengths @10 Gbps
BENCHMARKING WITH DISCRETE COMPONENTSSlide16
Modulator bandwidth
Number of ONUs per λNet Bit-rate per ONU and modulation formatTotal upstream net Bit-rate per λMaximum ODN loss11 GHz (reference)32
1 Gbps (16-QAM)32 Gbps31.4 dB22 GHz322 Gbps (16-QAM
)
64 Gbps
29.3 dB22 GHz
322.5Gbps (32-QAM)
80 Gbps25.1 dB
22 GHz
641 Gbps (16-QAM
)
64 Gbps30.1 dB
33 GHz323 Gbps (16-QAM)96 Gbps28.1 dB33 GHz322.25 Gbps (8-QAM)72 Gbps
32.0 dB33 GHz
641.5Gbps (16-QAM)
96 Gbps28.7 dB
33 GHz
64
1.1Gbps (8-QAM
)
72 Gbps
33.0 dB
WITH A BETTER MODULATORSlide17
Preliminary integrated ONU
version:
polarizing beam splitter, coupler,
segmented MZ intensity modulator, CMOS electrical driver flip-chipped on top
THE FIRST SILICON DEVICESlide18
Integrated on a test-board for system experiments with an external bi-directionally used SOA
THE FIRST SILICON DEVICESlide19
EXPERIMENTAL RESULTS AT 500Mb/s PER USER
Not yet suitable for PON but of potential interest for Passive Optical LANSlide20
SOA: A FUNDAMENTAL BLOCK
InP
over Si enables amplification in PIC:
fundamental for complex functionsSlide21
ABOUT 100$
(80% DUE TO PACKAGING)
Is it so important to have a low-cost ONU?
Most of the cost of PON is in the infrastructure!
NG-PON2 is designed to be compatible with existing
infrastructure
A miniaturized low-cost device could be built-in in PC, video-sets, etc.
Considering:
>1.000.000 pieces/year
the
size of the
SiP
chip, the
SOA,
the driver, commercial
FDM IC
IS IT LOW COST?Slide22
the effectiveness of a self-coherent reflective WDM/FDM PON architecture in complying to ODN loss standard requirements
a target cost for the FABULOUS ONU lower than 100€, suitable for home devices
the feasibility of complex Photonic Integrated Circuits and of low-speed DSP with FDM approach
We have demonstrated
SCIENTIFIC OUTCOMES
We need to improve the PIC performances via amplificationSlide23
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 access provided that:
LESSONS LEARNEDSlide24
FURTHER READINGS
We published 13 Journals (some for open access) and over 30 conference papers. Slide25
The research leading to these results has received funding from the European Community's Seventh Framework
Programme FP7/2007-2013 under grant agreement n°318704, titled:
25
ACKNOWLEDGMENTS
To contact the coordinator:
info@fabulous-project.eu
WEB site:
www.fabulous-project.eu
FABULOUS:
“FDMA Access By Using Low-cost Optical Network Units in Silicon Photonics”