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[802.3_100G-OPTX] 802.3cn Interim Teleconference ER8, ER4, ER1 Specifications Proposal Presentation preview



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

 

 

Table 1. 400GBASE PMD Optical Margin comparisons

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

 

 

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

 

 

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

 

 

Table 4. 802.3cn Data Statistics

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

 

 

Table 5.  P802.3cn draft D3.0 Select Optical Specifications Margin and Yield analysis

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

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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