Duobinary for 25G-PON - IEEEgrouper.ieee.org/.../NGEPONSG/public/2015_11/ngepon... · HUAWEI TECHNOLOGIES CO., LTD. Contribution to The IEEE 802.3 NG-EPON Study Group Meeting, Nov.
Post on 05-Jul-2018
224 Views
Preview:
Transcript
www.huawei.com
HUAWEI TECHNOLOGIES CO., LTD.
Contribution to
The IEEE 802.3 NG-EPON Study Group Meeting, Nov. 10-12, 2015
Duobinary for 25G-PON
Frank Effenberger
Fixed Access Network Research
Futurewei Technologies, Huawei R&D USA
Acknowledgements:
Zhicheng Ye, Shengping Li, and Xiang Liu
for technical contributions.
HUAWEI TECHNOLOGIES CO., LTD. 2
Agenda
25G TDM-PON and 25G TWDM PON
25G Optical Duobinary (ODB) / Electrical Duobinary (EDB)
Architecture
Experimental Results
ODB/EDB Advantages
Summary
HUAWEI TECHNOLOGIES CO., LTD. 3
25G TDM-PON and 4*25G TWDM-PON based on ODB modulation for downstream and EDB for upstream
λd1, λd2, λd3, λd4
λu1, λu2, λu3, λu4 1:N Power splitter
ODB Tx1, 25G
ODB Tx2, 25G
ODB Tx3, 25G
ODB Tx4, 25G
EDB Rx1, 25G
EDB Rx2, 25G
EDB Rx3, 25G
EDB Rx4, 25G
M A C
ONU1 Tx2 Rx2
ONU3 Tx3 Rx3
ONU4 Tx4 Rx4
ONU2 Tx1 Rx1
ONU5 Tx3 Rx3
EDFA WDM
MUX
DEMUX
OLT
US
DS
25G TDM-PON based on ODB and EDB modulation
λd
λu 1:N Power splitter
ODB Tx, 25G
EDB Rx, 25G
M A C
ONU1 Tx Rx
ONU3 Tx Rx
ONU4 Tx Rx
ONU2 Tx Rx
EDFA WDM
OLT
US
DS
4*25G symmetrical TWDM-PON structure
HUAWEI TECHNOLOGIES CO., LTD. 4
25G ODB/EDB Architecture – Downstream (DS) Downstream format: ODB
25G
25G
BERT
25G MZM Driver
1:N
25G CDR
10GHz APD/TIA
OLT ONU
M
U
X
Offline-DSP based 25G EDB Decoder with
a 7-tap FFE
ODB Precoder
25G EML Linear Driver
EDB Precoder
25G
25G
DFB Laser
EDFA
10GHz MZM
10G APD Linear ROSA
D
E
M
U
X 10G EML
TOSA
Splitter
25 Gb/s ODB Transmitter [1]
• Differential precoding ensures recovered bits are same as original signal bits
• The continuous wave output 1550 nm DFB laser is modulated by precoded signal
• Mach-Zehnder modulator (MZM) with 3 dB bandwidth of 10 GHz biased at intensity
null. Encoder uses low-pass filtering instead of 1-bit delay-and-add
• EDFA at OLT achieves +10 dBm launch power
25 Gb/s ODB Receiver
• High-bandwidth APD with 3 dB RF bandwidth of 10 GHz, plus 25 GHz TIA
• The electrical signal is reshaped by a 25 Gb/s linear amplifier followed by clock and
data recovery
HUAWEI TECHNOLOGIES CO., LTD. 5
25G ODB/EDB Architecture – Upstream (US) Upstream format: EDB
25G
25G
BERT
25G MZM Driver
1:N
25G CDR
10GHz APD/TIA
OLT ONU
M
U
X
25G EDB Decoder with
a 7-tap FFE
ODB Precoder
25G EML Linear Driver
EDB Precoder
25G
25G
DFB Laser
EDFA
10GHz MZM
10G APD Linear ROSA
D
E
M
U
X 10G
EML TOSA
Splitter
25 Gb/s EDB Transmitter [2]
• Differential precoding ensures recovered bits are same as original signal bits
• 10 GHz EML TOSA generates 3-level EDB signal due to bandwidth limitation
25 Gb/s EDB Receiver
• 10 Gb/s linear APD ROSA with EDB decoder
• EDB decoder consists of two threshold slicers and an exclusive-or
• 7-tap feed-forward equalizer (FFE) for post-equalization (EQ), to improve the performance of
EDB signal
• EDFA pre-amplifier at OLT increases the power budget to 32.5 dB
HUAWEI TECHNOLOGIES CO., LTD. 6
25G ODB Experimental Results
Fiber transmission results in a negative power penalty,
• fiber dispersion acts like a low pass filter consistent with ODB characteristics
At 10-3 BER (10-12 BER after standard FEC), the sensitivity is -24.2 dBm after
transmission over 20 km in the C-band (around 1550 nm)
EQ can further improve performance by 2 dB [3]
With +10 dBm launch power, a loss budget of 34.2 dB after 20 km has been
achieved
25Gbps ODB, C-band
-26 -24 -22 -20 -18 -16 -14-11
-9
-7
-5
-3
-20.5dBm-23.0dBm
log
(BE
R)
Rx Power (dBm)
B2B
20km
30km
-24.2dBm
HUAWEI TECHNOLOGIES CO., LTD. 7
25G EDB Experimental Results
After EQ, 10-3 BER receiver sensitivity are: -19.0, -21.2 and -22.5 dBm for
B2B, 20 and 30 km, respectively in the C-band (around 1550 nm)
Performance may be improved further, e.g., by better post EQ
With +2 dBm launch power and an EDFA preamplifier at the OLT, a loss
budget of 32.5 dB after 20 km has been achieved
25Gbps EDB, C-band
-24 -22 -20 -18 -16 -14-6
-5
-4
-3
-2
-1
-22.5dBm
B2B w/ EQ
20km w/ EQ
30km w/ EQ
log(
BE
R)
Rx Power (dBm)
B2B w/o EQ
20km w/o EQ
30km w/o EQ
-19.0dBm
-21.2dBm
HUAWEI TECHNOLOGIES CO., LTD. 8
25G ODB and EDB Experimental Results (cont.)
Distance ODB receiver sensitivity @10-3 EDB receiver sensitivity @10-3
0km (B2B) -20.5 dBm -22.5 dBm
20 km -24.2 dBm -21.2 dBm
30 km -23.0 dBm -19.0 dBm
Receiver sensitivities at 10-3 BER for 25 Gb/s ODB and EDB signals at different reaches
Experimentally measured eye diagrams of (a) 25 Gb/s ODB signals and, (b)25 Gb/s EDB signals
(a) (b)
20km w/ EQ
EML Output
20ps/div
20km w/o EQ
HUAWEI TECHNOLOGIES CO., LTD. 9
Advantages of the ODB/EDB Architecture
General PON requirements (P2MP) ONU simple: ODB receiver and EDB transmitter are as simple as NRZ
OLT enhancements: ODB transmitter and EDB receiver with post-EQ
Low cost; ODB/EDB realized with commercially available components ODB Downstream: 10 Gb/s MZM and 10 GHz APD/TIA receiver
EDB US: 10 Gb/s EML and 10 Gb/s linear APD ROSA
Potential for additional cost reduction • 10G InP or silicon photonics MZM vs 10G LiNbO3 DDMZ
• 10GHz APD ROSA replacing 25G APD ROSA
High performance ODB/EDB high dispersion tolerance; 25G transmission up to 30km at
C/L band
ODB/EDB offer high receiver sensitivity
Even higher ODB performance possible using 16 GHz APD ROSA and
post-EQ[3]
HUAWEI TECHNOLOGIES CO., LTD. 10
Summary
25 Gb/s/ TDM-PON system based on 25 Gb/s ODB modulation for DS
and 25 Gb/s EDB for US transmission
Provides high-performance solution with low cost
ONU: low-cost, similar to NRZ transceiver without optical amplification
ODB DS: about -24.2dBm sensitivity at 10-3 BER=1e-3 w/o EQ after
20km SSMF transmission in the C-band
EDB U/S: -21.2dBm sensitivity at BER w/ EQ after 20km in the C-band
Loss budget ≥ 32.5 dB at 1550 nm over 20-km w/o dispersion
compensation for both DS and US
This solution may provide an attractive evolutionary path for NG-EPON.
Thank you www.huawei.com
HUAWEI TECHNOLOGIES CO., LTD. 12
Bibliography
[1] D. van Veen et al., “40-Gb/s TDM-PON over 42 km with 64-way power split
using a binary direct detection receiver,” ECOC’14, PD.1.4
[2] V. Houtsma et al., “APD-Based DuoBinary Direct Detection Receivers for 40
Gbps TDM-PON,” OFC’15, Th4H.1
[3] Z. Ye et al., “Demonstration of High-Performance Cost-Effective 100-Gb/s
TWDM-PON Using 4x 25-Gb/s Optical Duobinary Channels with 16-GHz APD
and Receiver-Side Post-Equalization,” ECOC’15, Mo.3.4.4
top related