1. No category

Self-seeded WDM-PON
P. Parolari, L. Marazzi, M. Brunero, M. Martinelli
DEIB, Politecnico di Milano, Milano, Italy
WS5 - Is NG-PON2 an ultimate access solution?
Is there anything coming afterwards?
ERMES
The wavelength resource
TWDM-PON
WDM-PtP
Tunable
OLT
ONT
OLT
λ’
….
ONT
ONU
AWG
4x2.5G US
….
OLT
….
4x10G DS
λ
OLT
AWG
ONT
ONU
ONU
ERMES
The wavelength resource is taken for granted in NG-PON
Wavelength control and management are mandatory
Tunable lasers
using protocols or embedded-communication channels
using pilot-tones
Colorless seeded WDM-PON
Self-seeded WDM-PON
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeded WDM-PON
Self-seeding provides:
colourless transmitters
RSOAs [E. Wong et al., J. Lightwave Technol. 25(1), 67–74 (2007)]
FPs [M. Presi et al, IEEE Photon. Technol. Lett., 241(17),1523-1526 (2012)]
ERMES
automatic and passive wavelength assignment
determined by the plugged WDM multiplexer channel
robust control
determined by the physical mechanism associated
with cavity build-up
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeding principle of operation
RSOA
Active element
ERMES
The active element has a triple role:
Gain to make up for cavity losses
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeding principle of operation
RSOA
Active element
ERMES
The active element has a triple role:
Gain to make up for cavity losses
Modulation to directly impress data
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeding principle of operation
RSOA
ERMES
The active element has a triple role:
Gain to make up for cavity losses
Modulation to directly impress data
Saturation to cancel recirculating modulation
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeding principle of operation
RSOA
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeding principle of operation
RSOA
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Cavity build up
Output optical power evolution
during first roundtrips
ERMES
Output optical spectrum
evolution during build up
roundtrip time
red shift
Output optical power reaches steady state in less than 10 roundtrips
The spectrum takes one order of magnitude more roundtrips to steady state
The spectrum presents a red shift
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Self-seeded source quality
ERMES
Multimode source: thousands of modes for the short cavities to
hundreds of thousands for the km-long ones
RIN ≈20 dB better than spectrally sliced broadband optical sources
≈15 dB worse DFB
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Recent results C-band
2.5 Gb/s
OB [dB] @ BER 10-3
Drop fiber
BtB
25 km
50 km
75 km
10 m
34
33.3
32.6
27
1 km
32.4
32
29.5
5 km
30
28
Q. Deniel et al. "Self-seeded RSOA based WDM-PON transmission capacities” OFC 2013,
Anheim CA
Dispersion load [ps/nm] @ BER 3 10-3
10 Gb/s
ERMES
Drop
fiber
52 km
NZDF-
32 km
NZDF-
52 km
NZDF+8 km
SSMF
BtB
20 km
DSF
8 km
NZDF+
25 km
NZDF+
420 m
-300
-185
-160
0
10
23
72
Best result @ -29 dBm received power
L. Marazzi et al. “Up to 10.7-Gb/s High-PDG RSOA-based Colourless Transmitter for WDM
Networks” IEEE Photon. Technol. Lett, 25, 637, 2013
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
2.5 Gb/s
Recent results O-band
Drop fiber
Feeder fiber
BER
10 m
90 km
<1 10-5
10 km
50 km
<1 10-4
26 km
40 km
<3 10-4
ERMES
10 Gb/s
G. Simon et al. “70km external cavity DWDM sources based on O-band self seeded
RSOAs for transmissions at 2.5Gbit/s” OFC 2014, San Francisco CA
Drop fiber
Feeder fiber
BER
10 m
52 km
3 10-4
420 m
40 km
7 10-4
1 km
40 km
3 10-3
P. Parolari et al, “10-Gb/s Operation of a Colorless Self-Seeded Transmitter Over More
Than 70 km of SSMF”, IEEE Photon. Technol. Lett, 26. 599, 2014
No chromatic dispersion penalty
Optical power budget limited
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Conclusions
RSOA based self-seeded transmitters allow easy wavelength
control and management
Colourless: avoiding external seeding sources and associated
Rayleigh scattering
Self-tuning: robust passive and automatic wavelength
ERMES
assignment
Multimode optical carrier with better quality than spectrally sliced
broadband optical sources
Demostrated long cavity performance up to 10 Gb/s over more
than 40-km in O and C-band
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
ERMES
FP7-ICT-2011-7
Embedded Resonant and ModulablE Self-tuning
laser cavity for next generation access network transmitter
visit www.ermes-project.eu
ERMES talk @ ECOC 2014
Tu.1.7.4 Build-up Analysis of an RSOA-based Self-seeded Transmitter L. Marazzi et al.
Tu.3.2.5 125km Long Cavity based on Self Seeded RSOAs Colorless Sources for 2.5Gbit/s DWDM Networks F. Saliou et al.
P.7.20 Experimental evaluation of burst mode operation of a RSOA-based self-seeded transmitter M. Brunero et al.
P.7.14 Infrastructure impact on transmission performance of self-seeded DWDM colorless sources at 2.5Gbps G. Simon et al.
eye diagrams
10 Gb/s
2.5 Gb/s
ERMES
ER=5 dB
ER=4.3 dB
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
CD
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Polarization retracing topology
RSOA with very high modulation performance may show HPDG
Necessary a polarization retracing topology
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
PI curves
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?
Gaussian AWG various channels
ERMES
WS5 - Is NG-PON2 an ultimate access solution? Is there anything coming afterwards?