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Investigation of the technical feasibility for
200G/400G beyond 10km optical PHYs using
high-power TOSA and APD-ROSA
Shuto Yamamoto, Toshihide Yoshimatsu,
NTT Corporation
IEEE802.3 Interim meeting, Geneva, Jan. 2018
2
Overview
Feasibility investigation for 200G/400G beyond 10km optical PMD
� 53-Gb/s and 56-Gb/s PAM4 transmission experiments with high-
power TOSA and APD-ROSA
� Receiver sensitivity and dispersion penalty are evaluated
assuming 8-lane LAN-WDM 40-km transmission.
In Orlando meeting, …
investigation using normal EML + APD was reported. (sone_b10k_01a_1117)
In this meeting, …
investigation using high-power EML + APD is reported.
3
Assumed link budget for 50G/200G/400G 40km
50G 40km 200G 40km 400G 40km
Optical fiber 18 18 18
MUX 0 2 (4-ch MUX) 3 (8-ch MUX)
DEMUX 0 2 (4-ch DEMUX) 3 (8-ch DEMUX)
Dispersion penalty 0.5 0.5 (Worst CH) 1 (Worst CH)
MPI penalty 0.5 0.5 0.5
Other 1 1 1
Total 20 dB 24 dB 26.5 dB
4:1
mux
TOSA L0
TOSA L1
TOSA L2
TOSA L3
2:1
mux
4:1
mux
TOSA L4
TOSA L5
TOSA L6
TOSA L7
DEMUX loss
1:2
dem
ux 1:4
dem
ux
1:4
dem
ux
ROSA L0
ROSA L1
ROSA L2
ROSA L3
ROSA L4
ROSA L5
ROSA L6
ROSA L7
Optical-fiber loss (18dB)
MUX lossConfiguration of 8-lane LAN-WDM
* Engineered link
40-km
Single-mode fiber
(Engineered link)
2dB 1dB 2dB1dB
4
Experimental setup
VOA1ch TOSA
(L5)4ch ROSA
Optical fiber w/ dispersion
(40-km SMF equivalent)
Setup
High-power TOSA
APD-ROSA
(Including 4-ch DEMUX)
Link budget:
22 dB for 200G
24.5 dB for 400G
� PAM4 signal is transmitted using 1-ch high-power TOSA and 4-ch APD-ROSA.
� Receiver sensitivity and dispersion penalty are evaluated assuming 8-lane
LAN-WDM 40-km transmission.
� In the case with 4-ch ROSA including 4-ch DEMUX, the link budget is below;
- 200G: 24 dB → 22 dB
- 400G: 26.5 dB → 24.5 dB
Tx power measurement point Rx power measurement point
4:1
mu
x
TOSA L0
TOSA L1
TOSA L2
TOSA L3
2:1
mux
4:1
mu
x
TOSA L4
TOSA L5
TOSA L6
TOSA L7
DEMUX loss
(none for 200G/ 1dB for 400G)
4-ch ROSA
1:2
dem
ux
1:4
de
mu
x
1:4
de
mu
x
ROSA L0
ROSA L1
ROSA L2
ROSA L3
ROSA L4
ROSA L5
ROSA L6
ROSA L7
• Optical-fiber loss (18dB)
• Dispersion penalty
(0.5 dB for 200G/ 1dB for 400G)
• MPI penalty (0.5dB)
• Other (1dB)
MUX loss
(2dB for 200G/ 3dB for 400G)
22 dB (for 200G)
24.5 dB (for 400G)
5
Experimental result (53-Gb/s PAM4)
-18.00 dBm (BtoB)
BER=2E-4 (KP4-FEC)
Tx OMAouter = +7.23 dBm
4ch APD-ROSA performance1ch TOSA performance
CD Penalty=0.7dB
Link budget
= 25.2dB
200G
40 km
400G
40 km
Required 22 dB 24.5 dB
Measured 25.2 dB
Margin 3.2 dB 0.7 dB
*Tx eyediagram w/o FFE
In 8-lane LAN-WDM 40-km transmission, the range of
chromatic dispersion is from -203.3 to +37.5 ps/nm.
PRBS31, 1299.187nm, ER=7dB, TEC=45degC
6
Experimental result (56-Gb/s PAM4)
Tx OMAouter = +7.15 dBm
1ch TOSA performance
Link budget
= 26.2dB
200G
40 km
400G
40 km
Required 22 dB 24.5 dB
Measured 26.2 dB
Margin 4.2 dB 1.7 dB
*Tx eyediagram w/o FFE
-19.08 dBm (BtoB)
BER=1E-3 (Stronger FEC)
CD Penalty=0.7dB
4ch APD-ROSA performance
In 8-lane LAN-WDM 40-km transmission, the range of
chromatic dispersion is from -203.3 to +37.5 ps/nm.
PRBS31, 1299.187nm, ER=7dB, TEC=45degC
8
Conclusion
� We investigate the feasibility of 200G/400G 40km optical PMD
through the experiment using high-power TOSA & APD-ROSA.
� 200G/400G 40km transmissions have some margins.
OMA margin
53 Gb/s
(KP4-FEC)
56 Gb/s
(Stronger FEC)
200G 40km 3.2 dB 4.2 dB
400G 40km 0.7 dB 1.7 dB
1-dB improvement
10
Required link budget in this investigation
200G 40km 400G 40km
Optical fiber 18 18
MUX 2 (4:1 MUX) 3 (4:1 MUX & 2:1 MUX)
DEMUX - 1 (1:2 DEMUX)
Dispersion penalty 0.5 (Worst CH) 1 (Worst CH)
MPI penalty 0.5 0.5
Other 1 1
Total 22 dB 24.5 dB
* Engineered link
4:1
mu
x
TOSA L0
TOSA L1
TOSA L2
TOSA L3
2:1
mux
4:1
mu
x
TOSA L4
TOSA L5
TOSA L6
TOSA L7
DEMUX loss
(1dB)
4-ch ROSA
1:2
dem
ux
1:4
de
mu
x
1:4
de
mu
x
ROSA L0
ROSA L1
ROSA L2
ROSA L3
ROSA L4
ROSA L5
ROSA L6
ROSA L7
• Optical-fiber loss (18dB)
• Dispersion penalty (1dB)
• MPI penalty (0.5dB)
• Other (1dB)
MUX loss
(2dB + 1dB)
24.5 dB (for 400G)
400G
4:1
mu
x
TOSA L4
TOSA L5
TOSA L6
TOSA L7
4-ch ROSA
1:4
de
mu
x
ROSA L4
ROSA L5
ROSA L6
ROSA L7
• Optical-fiber loss (18dB)
• Dispersion penalty (0.5dB)
• MPI penalty (0.5dB)
• Other (1dB)
MUX loss
(2dB)
22.0 dB (for 200G)
200G
11
Block diagram
Link budget is defined from optical transmitter to optical receiver in our investigation.
12
Chromatic-dispersion penalty
-18.00
-20
-19
-18
-17
-16
-15
-14
-13
-12
-250 -200 -150 -100 -50 0 50
OM
Ao
ute
r (d
Bm
)
D (ps/nm)
Rx Sens. at BER=2E-4
LAN-WDM 8λ 40km:-203.3 ~ +37.5ps/nm
-0.5
0
0.5
1
1.5
-250 -200 -150 -100 -50 0 50Po
we
r P
en
alt
y (
dB
)
D (ps/nm)
CD Penalty
0.56 0.22
CD penalty ≦ 0.56dB (-203.3~+37.5ps/nm)
26GBd
-19.08
-20
-19
-18
-17
-16
-15
-14
-13
-12
-250 -200 -150 -100 -50 0 50
OM
Ao
ute
r (d
Bm
)
D (ps/nm)
Rx Sens. at BER=1E-3
LAN-WDM 8λ 40km:-203.3 ~ +37.5ps/nm
-0.5
0
0.5
1
1.5
-250 -200 -150 -100 -50 0 50Po
we
r P
en
alt
y (
dB
)
D (ps/nm)
CD Penalty
0.51 0.21
CD penalty ≦ 0.51dB (-203.3~+37.5ps/nm)
28GBd
14
Beyond 10km: stronger FEC
� Several potential hard-decision FEC with 8-9 dB NGC can help to
achieve beyond 10km 400GbE.- RS-FEC, BCH-FEC, or Staircase FEC…
Ref.) B. P. Smith, et al., JLT, no. 1, vol. 30 (2012) Ref.) wang_ecdc_01_0316
◆
KP4
15
400GbE 40km application
Extended reach interface is essential for inter-building connections
in service providers network.
Single-mode fiber
Reach 2 km 10 km 40 km
Application
802.3bsobjectives ✔ ✔ -
L2-SW
TransportSystem
Inter-building usage #12 km and 10 km
Inter-building usage #210 km and 40 km
L2-SW
TransportSystem
100GE 100GE
Intra-building usage2 km and 10 km
Long haul NW L2-SW L2-SW
100GE
L2-SW
TransportSystem
L2-SW
TransportSystem
Long haul NW L2-SW
100GE 100GE
Intra-building
Inter-building usage #1
Inter-building usage #2
Direct connection without long-haul transmission system
10-km reach:Covers 50% of inter-building links
40-km reach (for example):Covers almost 100% of inter-building links
10-km reach:Covers 50% of inter-building links
40-km reach (for example):Covers almost 100% of inter-building links
L2SW/ Router to long-haul transport system
L2SW/ Router to long-haul transport system
• Low-cost solution for some metro areas