Dear Colleagues,
At ECOC 2019, I received several clarifications from contributors about their TF data sets. I have accordingly updated the Margin and Yield analysis Tables newly numbered 4, 5, 6, and 7, see below. The changes are only a few tenths of a
dB from previous analysis.
Also added are new Tables 1, 2, and 3 for ER8, ER4, and ER1, respectively, comparing the Optical Margins between all the TF contributed data sets. Since Jan. 2018, every data set shows the same thing:
- ER8 does not have sufficient TX and RX Optical Margin to be manufacturable,
- ER1 and ER4 will benefit from decreasing TX OMA (min) and RX Sens (max).
TF contributors recognized that to meet the 40km ER8 reach requirement with sufficient manufacturing margin requires technologies. For example,
Shuto Yamamoto identified stronger FEC and
Xinyuan Wang identified enhanced EML, enhanced APD, and enhanced FEC. There may be others. When applied to ER8, these will fundamentally alter the spec, in unknown combination of TX OMA (min), RX Sens (max), penalties, and other changes. It is very unlikely
that the new technologies will optimally match the 40km ER8 spec. baseline in Draft 3.0.
The TF choice is simple:
- Adopt 30km reach ER8 spec. which is feasible today.
- Defer adopting any spec. until new technologies are proven to support 40km reach, and then write a new spec accordingly,
Adopting a 40km spec. not manufacturable with today’s technology does not serve anyone’s interests.
Chris
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Table 1. 400GBASE PMD Optical Margin comparisons
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|
Reference
|
400GBASE
PMD
|
Transmitter
Optical Margin
(or Yield)
|
Receiver
Optical Margin
(or Yield)
|
Total
Optical Margin
(or Yield)
|
Units
|
|
cole_3bs_01a_0515
|
LR8
|
2
|
1.9 *
|
3.9
|
dB
|
|
yamamoto_b10k_01a_0118
(1 RX, 1 TX data sets)
|
ER8
|
-0.2
|
0.9
|
0.7 *
|
dB
|
|
yu_b10k_01c_0318
(2 RX, 1 TX data sets)
|
ER8
|
0.9
|
0.2
|
1.1
|
dB
|
|
wang_b10k_01a_0518
(1 RX, 1 TX data sets)
|
ER8
|
1.6
|
-0.1
|
1.5 *
|
dB
|
|
jackson_b10k_01_0918
(2 RX, 2 TX data sets)
|
ER8
|
0.9
|
0.2
|
1.1
|
dB
|
|
huang_b10k_01a_0918
(2 RX data sets)
|
ER8
|
|
-0.1
|
|
dB
|
|
cole_3cn_01_190924
draft D3.0 analysis
|
ER8
|
0.9
|
0.1
|
1.0
|
dB
|
|
42
|
2
|
1
|
%
|
|
cole_3cn_01_190924
draft D3.0 proposal
|
LR8
|
2.0
|
1.9
|
3.9
|
dB
|
|
98
|
100
|
98
|
%
|
|
* Margin shown in the presentation
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|
Table 2. 200GBASE PMD Optical Margin comparisons
|
|
Reference
|
200GBASE
PMD
|
Transmitter
Optical Margin
(or Yield)
|
Receiver
Optical Margin
(or Yield)
|
Total
Optical Margin
(or Yield)
|
Units
|
|
cole_3bs_03_0516
|
LR4
|
3.1
|
2.2 *
|
5.3
|
dB
|
|
yu_b10k_01c_0318
|
ER4
|
1.1
|
2.2
|
3.3 *
|
dB
|
|
cole_3cn_01_190924
draft D3.0 analysis
|
ER4
|
0.8
|
2.1
|
2.9
|
dB
|
|
65
|
100
|
64.6
|
%
|
|
cole_3cn_01_190924
draft D3.0 proposal
|
ER4
|
1.5
|
1.4
|
2.9
|
dB
|
|
96
|
100
|
96
|
%
|
|
* Margin shown in the presentation
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Table 3. 50GBASE PMD Optical Margin comparisons
|
|
Reference
|
50GBASE
PMD
|
Transmitter
Optical Margin
(or Yield)
|
Receiver
Optical Margin
(or Yield)
|
Total
Optical Margin
(or Yield)
|
Units
|
|
cole_3cd_01_0516
|
LR1
|
6.2
|
3.1 *
|
9.3
|
dB
|
|
xu_3cn_01b_1118
|
ER1
|
2.9
|
4.2
|
7.1
|
dB
|
|
cole_3cn_01_190924
draft D3.0 analysis
|
ER1
|
2.8
|
4.1
|
6.9
|
dB
|
|
100
|
100
|
99.8
|
%
|
|
cole_3cn_01_190924
draft D3.0 proposal
|
ER1
|
3.9
|
3.0
|
6.9
|
dB
|
|
100
|
100
|
100
|
%
|
|
* Margin shown in the presentation
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Table 4. 802.3cn Data Statistics
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|
Description
|
median
|
average
|
sigma
|
min
|
max
|
units
|
|
TX OMA
Pre-Mux
|
8.2
|
8.2
|
0.7
|
7.2
|
9.0
|
dBm
|
|
RX Sens OMA
Post-DeMux
|
-19.2
|
-19.2
|
0.4
|
-20.0
|
-18.6
|
dBm
|
|
|
|
Sigma bin
|
-3 → -2
|
-2 → -1
|
-1 → 0
|
0 → 1
|
1 → 2
|
2 → 3
|
|
TX OMA bin count
|
0
|
1
|
1
|
2
|
1
|
0
|
|
TX Normal ref. count
|
0.1
|
0.7
|
1.7
|
1.7
|
0.7
|
0.1
|
|
RX Sens OMA bin count
|
0
|
1
|
3
|
3
|
1
|
0
|
|
RX Normal ref. count
|
0.2
|
1.1
|
2.7
|
2.7
|
1.1
|
0.2
|
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Table 5. P802.3cn draft D3.0 Select Optical Specifications Margin and Yield analysis
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Transmitter Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
40
|
km
|
|
Penalties
|
2
|
2
|
2
|
dB
|
|
Mux loss (max)
|
0
|
2
|
3
|
dB
|
|
TX OMA (max)
|
7.4
|
7.4
|
6.4
|
dBm
|
|
TX OMA (min)
|
3.4
|
3.4
|
2.4
|
dBm
|
|
TX OMA (min) margin
|
2.8
|
0.8
|
0.8
|
dB
|
|
TX OMA Yield
|
100
|
65
|
42
|
%
|
|
|
|
|
|
|
|
Receiver
Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
40
|
km
|
|
RX Sens OMA (max)
SECQ = 1.4
|
-15.1
|
-15.1
|
-16.1
|
dBm
|
|
DeMux loss (max)
|
0
|
2
|
3
|
dB
|
|
RX Sens OMA (max) margin
|
4.1
|
2.1
|
0.1
|
dB
|
|
RX Sens OMA Yield
|
100
|
100
|
2
|
%
|
|
|
|
|
|
|
|
TX OMA * RX Sens Yield
|
100
|
65
|
1
|
%
|
|
Table 6. P802.3cn draft D3.0 Select Optical Specifications with public comment changes analysis
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|
Transmitter Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
30
|
km
|
|
Penalties
|
2
|
2
|
2
|
dB
|
|
Mux loss (max)
|
0
|
2
|
3
|
dB
|
|
TX OMA (max)
|
7.4
|
5.2
|
4.2
|
dBm
|
|
TX OMA (min)
|
3.4
|
1.2
|
0.2
|
dBm
|
|
TX OMA (min) margin
|
2.8
|
3.0
|
3.0
|
dB
|
|
TX OMA Yield
|
100
|
99
|
98
|
%
|
|
|
|
|
|
|
|
Receiver
Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
30
|
km
|
|
RX Sens OMA (max)
SECQ = 1.4
|
-15.1
|
-17.3
|
-15.3
|
dBm
|
|
DeMux loss (max)
|
0
|
2
|
3
|
dB
|
|
RX Sens OMA (max) margin
|
4.1
|
-0.1
|
0.9
|
dB
|
|
RX Sens OMA Yield
|
100
|
4
|
91
|
%
|
|
|
|
|
|
|
|
TX OMA * RX Sens Yield
|
100
|
3
|
90
|
%
|
|
Table 7. P802.3cn draft D3.0 Select Optical Specifications with updated proposed changes analysis
|
|
Transmitter Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
30
|
km
|
|
Penalties
|
2
|
2
|
2
|
dB
|
|
Mux loss (max)
|
0
|
2
|
3
|
dB
|
|
TX OMA (max)
|
6.3
|
6.7
|
5.2
|
dBm
|
|
TX OMA (min)
|
2.3
|
2.7
|
1.2
|
dBm
|
|
TX OMA (min) margin
|
3.9
|
1.5
|
2.0
|
dB
|
|
TX OMA Yield
|
100
|
96
|
98
|
%
|
|
|
|
|
|
|
|
Receiver
Description
|
50GBASE-ER1
|
200GBASE-ER4
|
400GBASE-ER8
|
unit
|
|
Reach
|
40
|
40
|
30
|
km
|
|
RX Sens OMA (max)
SECQ = 1.4
|
-16.2
|
-15.8
|
-14.3
|
dBm
|
|
DeMux loss (max)
|
0
|
2
|
3
|
dB
|
|
RX Sens OMA (max) margin
|
3.0
|
1.4
|
1.9
|
dB
|
|
RX Sens OMA Yield
|
100
|
100
|
100
|
%
|
|
|
|
|
|
|
|
TX OMA * RX Sens Yield
|
100
|
96
|
98
|
%
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