Novel Coherent pluggable Transceivers for future WDM …s3.amazonaws.com/JuJaMa.UserContent/b460feaf-7ee6... · 100G 200G 200G 200G ... FUJITSU OPTICAL COMPONENTS CONFIDENTIAL 11

1 FUJITSU OPTICAL COMPONENTS CONFIDENTIAL Copyright 2016 FUJITSU OPTICAL COMPONENTS LIMITED FUJITSU OPTICAL COMPONENTS CONFIDENTIAL

Novel Coherent pluggable

Transceivers for future WDM

networks

June 30th, 2016

Next Generation Optical Networking Conference – Nice, France

Kenichi Nakamoto Marketing Department

Fujitsu Optical Components Limited

2 FUJITSU OPTICAL COMPONENTS CONFIDENTIAL Copyright 2016 FUJITSU OPTICAL COMPONENTS LIMITED

Outline

Market Overview ~Global Traffic Trend~

Solutions for Requirements

Summary

Enabling components technologies

(Modulator, Receiver)

Novel Coherent pluggable transceivers

Requirements for Metro and DCI


Market Overview ~Global Traffic Trend~

x2

x3

x4

Source:

Cisco Visual Networking Index: Forecast and Methodology, 2014–2019

Cisco Global Cloud Index: Forecast and Methodology, 2014–2019

High Capacity demand for Metro and DCI is rapidly increasing compared to Long Haul.

Global traffic growth of Metro and DCI is faster than Long haul.


Requirement

High capacity

Increasing capacity / card

⇒High Port density

Increasing capacity / fiber

⇒High spectral efficiency

Requirements for Metro and DCI

What are the solutions for High Port density and High spectral efficiency?


Pluggable

(Pay as you grow)

Approach for High port density

Framer

DSP DAC

ADC

Line Card

Side Front

Framer

Line Card

Side Front

DSP DAC

ADC

Low port density

High port density High bit rate

Ex) >200Gbps

⇒High baud rate

High baud rate and Small size are solutions for High port density.

Small size

DSP DAC

ADC

Small bit rate

Ex) 100Gbps

Large size


DP-QPSK

Constellation

DP-QPSK

DP-8QAM

DP-16QAM

DP-16QAM

Baud Rate

32Gbaud

64Gbaud

43Gbaud

32Gbaud

64Gbaud

Capacity

per carrier

# of carriers

for 600G

6

3

3

3

1.5

100G

200G

200G

200G

400G

DP-64QAM 64Gbaud 1

600G

Approach for High Spectral efficiency

Long Haul

Metro

DCI

Low

High

Long

Short

Reach Spectral

Efficiency

High order modulation is a solution for High Spectral efficiency.


Solutions for High capacity and effects

Requirement Solution Effect

High capacity

Increasing capacity / card

⇒High Port density Increasing transceiver bit rate

⇒High baud rate

Reduce number of

Transceiver / bit

rate

Small size Pay as you grow by

Pluggable

Increasing capacity / fiber

⇒High spectral efficiency High order modulation Reduce number of

fiber / bit rate

High spectral

efficiency and reach

are trade-off

Which solution should be selected or mixed?

It depends on “which effect is prioritized”.

⇒ What are the components technologies for each solution?


Main characteristics and figure of merits

Figure of Merit for Modulator

The figure of merits are used to investigate modulator performance.

Characteristics Relation with L Figure of merit

Insertion loss ∝ L Optical propagation loss α[dB/cm]

Driving voltage ∝ 1/L Multiplication of driving voltage and

electrode length Vπ・L [V・cm]

(Maximum L is limited by required BW) EO bandwidth ∝ 1/L

Electrode length: L

How can we investigate modulator performance?


p n

p n i

0.1

1

10

100

0.1 1 10 100

Eff

icie

ncy: VpL(V

·cm)

Propagation loss: a (dB/cm)

Operation speed

: >25Gbaud

: >50Gbaud

InP

LN Si-photonics

Modulator performance comparison (High Baud Rate)

LN

- High Baud Rate w/ low loss

InP

- High Baud Rate w/ low Vπ

LN and InP are candidates for High Baud Rate.

Si-photonics

- Performance improvement is required for High Baud Rate

Performance

improvement


Linearity

in phase modulation

Phase modulation in MZI modulator

Extinction ratio

∞ 25dB

LN

InP

Modulator performance comparison (High Order Modulation)

Δφ

[ a

.u.]

Δloss

[d

B a

.u.]

Applied voltage [a.u.]

Ideal modulation

Δφ

[ a

.u.]

Δloss

[d

B a

.u.]

Applied voltage [ a.u.]

Less distorted

ER. 25dB

Distorted

- Linearity and Extinction ratio are the key for precise phase modulation.

- LN is best for High Order Modulation.


Modulator comparison (Summary)

Opt. OUT

Pol. Rotator

Pol. Beam

Combiner

XI

XQ

YI

YQ

PM-IQ Modulator

Tu

na

ble

la

se

r

Distortion by by Non-Linearity

Distortion by Low Extinction Ratio

Proper Constellation

LN, which could cover higher baud rate and xQAM, is the best materials.

Item LiNbO3 InP Si-P

High baud rate High bandwidth Best Best

High order

modulation

High linearity Best Under study

Extinction Ratio Best Under study

Small Size Chip size Large Small Smallest

High baud rate: LiNbO3 = InP > Si-Photonics

High order modulation: LiNbO3 > InP > Si-Photonics

Small size: Si-Photonics > InP > LiNbO3


Solution for 64G baud

Improvement of electric field

efficiency by newly designed

strong confinement waveguide

BW and Vπ are Trade off

Target BW Expand

Vπ increase

strong

confinement

waveguide

Existing

Electrode length

Short Long

Latest study result

Conventional result

Enabling Technology for 64G baud LN

Improved EO characteristics

35GHz min @-3dB

45GHz min @-6dB

Compliant with OIF HB PMQ

modulator (under discussion)

64G baud LN will be

realized soon.

13 Copyright 2016 FUJITSU OPTICAL COMPONENTS LIMITED

Enabling Technology for High baud ICR

Solution for 64G baud

Need to improve PD /TIA bandwidth

(target: >40GHz@-3dB)

Trade off

- PD bandwidth and Responsivity

- TIA bandwidth and Trans impedance

ICR bandwidth and sensitivity are trade-off

⇒Sensitivity is a key factor for High baud rate

Utilizing technology enabling high sensitivity is best for

High baud ICR.


Receiver comparison (summary)

Item Element

High Baud Rate

Bandwidth PD, TIA

Sensitivity PD, TIA

Optics

High order

modulation Linearity TIA

Item Silica PLC InP-PIC Si-P

Sensitivity Propagation Loss Best

Coupling loss Best

Size Chip size Small Small Smallest

PBS/Rotator Monolithic Hybrid Monolithic

Photo Diode Hybrid Monolithic Monolithic

LO input

Signal Input PBS

Rotator

Coupling

DSP

ADC

ADC

ADC

ADC

TIA

Photo Diode

PLC

Integrated Coherent Receiver 90 deg Hybrid

Receiver configuration

High baud rate: Silica PLC > InP-PIC > Si-Photonics

Small size: Si-Photonics > InP-PIC > Silica PLC

Optics comparison

15 Copyright 2016 FUJITSU OPTICAL COMPONENTS LIMITED

Novel Coherent pluggable transceiver Baud rate

64G

43G

32G

Modulation

format

3000km 600km 150km

1000km

48G

1500km 80km

100km

300km

400km

16QAM 32QAM 8QAM QPSK 64QAM

Baud rate

64G

43G

32G

Modulation

format

48G

16QAM 32QAM 8QAM QPSK 64QAM

Metro LN / PLC (Large) InP (Small)

SiP (Smallest)

100G 200G 300G

400G

600G

Modulator / Receiver

Application Demand Solution Modulation

format

Form

factor Technology

Metro

Reach:

300~600km

-

Reduce number of

Transceiver -

High baud rate ~64G baud

~16QAM

Large

~Small

LN / InP

PLC

Pay as you grow Small size ~48G baud

~16QAM Smallest

SiP

SiP

DCI

Reach:

80~150km

Reduce number

of fiber

Reduce number of

Transceiver High order

modulation

High baud rate ~64G baud

~64QAM Large

LN

PLC

Pay as you grow Small size ~48G baud

~64QAM Smallest

Under

investigation

Solutions and Technologies should be decided by appl. and demand.

DCI

Application

Metro DCI

Under

investigation


Summary

High capacity is strongly required for Metro and DCI.

⇒ High Baud rate, High order modulation, and Small size are

solutions for High capacity

Components technologies for each solution were discussed. Modulator

- High baud rate: LiNbO3 = InP > Si-Photonics

- High order modulation: LiNbO3 > InP > Si-Photonics

- Small size: Si-Photonics > InP > LiNbO3

Receiver

- High baud rate: Silica PLC > InP-PIC > Si-Photonics

- Small size: Si-Photonics > InP-PIC > Silica PLC

⇒ Solutions and Technologies for Novel Coherent pluggable

transceivers should be decided by application and demand.

Need to investigate technology evolution continuously.

(ex. SiP w DSP’s BW compensation)


Documents

Novel Coherent pluggable Transceivers for future WDM …s3.amazonaws.com/JuJaMa.UserContent/b460feaf-7ee6... · 100G 200G 200G 200G ... FUJITSU OPTICAL COMPONENTS CONFIDENTIAL 11