Duobinary for 25G-PON - IEEE 802ieee802.org/3/NGEPONSG/public/2015_11/ngepon_1511... · HUAWEI...

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


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


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


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


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


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


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


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]


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


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

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