ECOC, 2012 Market Focus – Optical Networks Advances

100G Coherent Transceiver Technologies for DWDM Metro Applications:

Key Requirements and Design Trends

Benny Mikkelsen benny.mikkelsen@acacia-inc.com

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100G Metro Market

What do we learn from 10G

What do we learn from initial Coherent Deployments

Metro Requirements and Key Challenges

100G Coherent Transceivers for Metro Applications

ASIC and DSP

Optical Integration

Form-Factor

Design Trends

Summary

Outline

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Metro market takes-off ~2 years after Long-Haul

Metro market is 2-3 times Long-Haul market

10G Transceivers started out as in-house development but transitioned to outsourcing, i.e., modules (>90% today)

Almost no difference between Long-Haul and Metro Transceivers today

Pluggable Transceivers are ultimate solution

What do we learn from 10G

10G - 2009 10G - 2003

In-house Market share Module Market Share

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Primarily used in Long-Haul

Adds capacity on brown-field and green-field

Provides the ultimate reach and equalization

Very spectral efficient – PM-QPSK

Fast setup and provisioning

Fast protection switching

Adds Intelligent performance statistics

Provides lower total cost of ownership

Started out as in-house development

OIF compliant modules are available

5”x7”, <80W, MDIO and 168 pin interface

Metro not efficiently supported by current solutions

Too big, too power hungry, and too expensive

What do we learn from initial deployments of 100G Coherent Transceivers

100G DWDM Transceivers

Un

its

(K)

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?

100G Transceiver Module Landscape

10km

24W

28W

32W

50W

40km 80km 500km 1000km >2000km

80W

100GBASE-LR4

100GBASE-ER4

CFP Non-Coherent

Multi-wavelength

OIF, 5”x7” Coherent PM-QPSK Single-wavelength

? 4, ODB Metro

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Metro covers a broad range of distances

Metro-Regional: 500-1000km

Metro-Core: 100-500km

Metro-Access: 40-100km

Optical characteristics

Many ROADMs and many shorter spans

Fiber type often unknown

Typical specs: ~16dB OSNR, 12ps PMD, CD up to 1000km

Single-wavelength 100G Coherent Transceiver very desirable

Density is very important

Form factor options: CFP/32W, 4”x5”MSA/40W,….

Key metrics

Cost, Size & Power, Optical Performance

Metro Requirements for 100G

CFP

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Possible modulation formats

PM-BPSK, PM-QPSK, PM-16QAM

PM-QPSK is good compromise between performance and power

Key Transceiver Technologies

ASIC, DSP, Photonic Integration, Packaging

Transceiver Power Consumption determines Form-factor

Heat dissipation is the real challenge

Key Technologies and Challenges for 100G Coherent Metro Transceiver

Reach

Po

we

r

QPSK

BPSK

16QAM

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Power consumption of 100G Coherent Transceiver is primarily determined by ASIC/DSP

Power of ADC, DAC and DSP scales with baud rate

Power depends on specs (PMD, CD, OSNR)

Metro specific specs are important

DSP tool box: # of bits, sampling rate,….

Power of ADC, DAC, Serdes almost equal to DSP

Power of ASIC depends on additional features

SD-FEC, OTN functionalities, number of modes

Latest CMOS node is important (40nm 28nm)

20-30% power savings with new node size

ASIC/DSP

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Optics and associated driver electronics have large impact on size and cost of Transceiver

Photonic integration important for size and cost reduction

InP as integration platform

Integration of laser and modulators

Integration of 90deg hybrid and detectors

High yield is challenging

Silicon as integration platform

Integration of PBS, 90deg hybrid and detectors

Integration of PBS and modulators

Integration of laser difficult

Lowest cost with concurrent DSP and Optical design

Imperfections in optical components can be mitigated by DSP

Photonic Integration

CMOS wafer contain 1000’s of low cost integrated chips

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Similar to 10G, Pluggable Transceiver is the ultimate solution

100G DWDM Coherent Metro Transceiver in CFP

Possible to fit ASIC/DSP and Optics

Likely to be available within 1-2 years

Attractive for metro transport

Routers have high face plate density requirements

CFP2 and CFP4 attractive

Difficult to fit both ASIC/DSP and Optics

Optics in CFP2/4, ASIC/DSP on host card

Challenging high speed analogue interface

Form Factor Options for 100G DWDM Coherent Metro Transceiver

CFP2/4 Host

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Programmable Performance and Features

Power Savings

CD and PMD range

FEC performance

Modulation format

Spectral efficiency and reach

Higher than 100G data rate

Client Interfaces

10G/28G Serdes, OTL4.10/4.4, CAUI

OTN and Ethernet wrapping

Miniaturization of Optics

Technology and Design Trends for 100G DWDM Coherent Metro Transceivers

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100G Coherent transceivers very successful in Long-Haul today

100G Metro market expected to emerge in 1-2 years

Metro market is 2-3 times Long-Haul

Today’s 100G DWDM transceivers do not meet Cost, Size and Power target for Metro

100G DWDM Coherent Transceiver in CFP form factor is attractive near term solution

Purpose built Metro ASIC/DSP combined with Highly Integrated Optics is likely to meet Cost and Density target for DWDM Metro Applications

Summary

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Thank you!