baseline proposal for 500m 400gbe using 8x50g...

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Baseline Proposal for 500m using 8x50G NRZ

Atsushi Takai, Kohichi Tamura and

Kiyohisa Hiramoto, Oclaro Japan, Inc

IEEE802.3bs 400GbE Task Force, Interim, May 2015

2 IEEE P802.3bs Interim Meeting in May 2015, OPN-PRS-15015-0.0

Supporters

Atsushi Sugitatsu, Mitsubishi Electric Corporation

Yoshikazu Tanaka, Mitsubishi Electric Corporation

Keisuke Kojima, Mitsubishi Electric Research Laboratories

Mizuki Shirao, Mitsubishi Electric Corporation

Scott Irwin, Mosys

Graeme Boyd, PMC-Sierra

Ichiro Ogura, PETRA


Features

– Use of low cost un-cooled DFB

– Use of low cost OSA structure using BiDi scheme

– Easy for backward compatibility with 100G PSM4 MSA (need further specification discussion)


The same as cole_3bs_01a_1114 except below

– Extinction Ratio: TBD (to consider uncooled DFB)

– Transmitter 3dB frequency: Not specified

Transmit Characteristics (Modification)

Remove

TBD

Remove

2.8


The same as cole_3bs_01a_1114

Receive characteristics (Modification)

Remove

-9.8


The same as cole_3bs_01a_1114

Link Power Budget (Modification)

Remove

3.3

7.3

0.5

4.0


Modify as below

– Agreement with both end-channel wavelengths in 40GbE_LR4

– These wavelengths may change with another 40GbE_LR4 wavelengths

Wavelengths (Modification)

Center Wavelength Wavelength Range

L0 1270nm 1264.5 to 1277.5 nm

L1 1330nm 1324.5 to 1337.5 nm

Below


Fiber dispersion were calculated as below.

2.5km can be achievable based on commercial available 25Gbit/s CWDM DFB’s that is capable for 10km, assuming the same a-parameter

Dispersion for wavelength

ITU-T G.652

Dispersion 500m

1264.5 nm -5.87 ps/nm/km -2.94 ps/nm

1337.5 nm 3.31 ps/nm/km 1.65 ps/nm

1337.5 nm 1264.5 nm

Min Dispersion

Max Dispersion

rateBit :B distance,on Transmissi :L where12B

L


Two implementations

– The same specifications

– PSM4 fiber fabric

2l WDM TOSA/2l WDM ROSA

– Two LD’s and optical filter in a TOSA package

– Two PD’s and optical filter in a ROSA package

2l WDM BOSA

– One LD, one PD and optical filter in a BOSA package

Implementations


2l WDM TOSA/2l WDM ROSA Implementation

R1

R

2

R3

R

4

T4

T3

T2

T1

1

2

3

4

4

3

2

1

T R

CDR50G

TIA PD

DMUX

PDCDR TIA50G

RX0

RX1

CDR50G

TIA PD

DMUX

PDCDR TIA50G

RX6

RX7

RX2

RX3

RX4RX5

CDR50G

DRV LD

MUX

LDCDR DRV50G

TX0

TX1

CDR50G

DRV LD

CDR50G

TX6

TX7

TX2

TX3

TX4TX5

MPO1 x 12SMF

Blue : λ1 = 1270 nmGreen : λ2 = 1330 nm

MUX

MUX

MUX

LDDRV

DMUX

DMUX

1

2

3

4

4

3

2

1

T R


2l WDM BOSA Implementation

CDR50G

DRVTXchip

filter

RXchip

CDR TIA50G

TX4

RX3

CDR50G

DRVTXchip

filter

RXchip

CDR TIA50G

TX7

RX0

TX5

RX2

TX6RX1

CDR50G

DRVTXchip

filter

RXchip

CDR TIA50G

TX0

RX7

CDR50G

DRVTXchip

filter

RXchip

CDR TIA50G

TX3

RX4

TX1

RX6

TX2RX5

MPO1 x 12SMF

Blue : λ1 = 1270 nmGreen : λ2 = 1330 nm

filter

filter

filter

filter

CH

0

CH

1

CH

2

CH

3

CH

4

CH

5

CH

6

CH

7

0

1

2

3

4

5

6

7

CH

C

H

0

1

2

3

4

5

6

7

CH

C

H


We will investigate which implementation is best for cost and space.

Comparison

LD (L0)

PD (L1)

MT-ferrule

X 4

LD (L1)

PD (L0)

X 4

LD (L0)

LD (L1)

MT-ferrule

X 4

PD (L1)

PD (L0)

X 4

2l WDM TOSA/ 2l WDM ROSA

2l BOSA


LD array (same l)

PD array

LD

PD

Use of array devices reduce the cost – Array devices are applicable in favor of robustness against channel-to-channel cross-talk with

higher transmitter SNDR margin

– The same wavelength 4-channel DML array cost is not significantly increased by well controlled process

– Significant cost reduction by reducing number of parts such as package, filter and PD array

Examples of BOSA using Array Devices

MT-ferrule

MT-ferrule

x 4 x 2l

X 2l


Thank you

baseline proposal for 500m 400gbe using 8x50g...

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