用于3d传感的vcsel多层结与可寻址技术 - sensing$1.68b fy20* revenue >5500 employees...

用于3D传感的VCSEL多层结与可寻址技术Multi-Junction and Addressable VCSEL Design

for 3D Sensing Application

计超 (Chao Ji)亚太区资深FAE (APAC Sr. FAE)

09/24/2020

© 2020 Lumentum Operations LLC 2

Lumentum公司和产品简介Company profile and product introduction

多层结VCSEL技术特点及其应用Multi-junction VCSEL design concept and the use case

可寻址VCSEL类型和演进方向Single-zone VCSEL upgraded to multi-zone VCSEL


Lumentum – World’s Leading Optical Solutions Provider

$1.68B FY20* revenue

>5500 employees

>1800 patents

Leadership positions:

• 3D sensing diodes

• Telecom transport and transmission

• 100G data center laser chips

Largest global

supplier of 3DS

illuminators –

several times over

Develop

innovative reference

designs with

eco-system

Highest

quality and

reliability

Established

high-volume,

manufacturing

infrastructureIntegrated packages

reference designs

Diversified Business

61% 29%

10%

*Fiscal year ended June 27, 2020

Industrial and Consumer

Laser Diodes

#1


3D Sensing: Past, Present, and Near-Future Applications

Cabin monitoring World-facing for AR Mobile front-facing for

biometrics

Gaming, PC, various

niche applicationsL4/L5 consumer

vehicle LIDAR

Non-mobile application

AR/VR, Surveillance,

robot, interactive app

2010-2016

2017

2018

2019

TODAY

2021

2022 - 2025

3DS

VCSEL

3DS

EEL

VCSEL on

Carrier

RoboTaxi

LiDAR

Multi-Junction

VCSEL

High

Reliability

VCSEL

FMCW LOSA


30cm ~ 1m 3m 10m5m

Products Offering, VCSEL chips for Flash i-ToF

Power Level 2.3W 2.4W 2.9W 3.2W 4.3W 5.1W 8.4W

Operating Voltage 2V 1.6V – 2.4V 1.7V – 2.3V 1.75V – 2.3V 3.5V-3.7V 1.75V – 2.3V 4.3V – 5.0V

Die Size 880*850 um2 780*680 um2 980*880 um2 950*850 um2 870*830 um2 1170*960 um2 980*880 um2

Bond Pad Type Single Dual Dual Dual Single Dual Dual

Junction 1J 1J 1J 1J 2J 1J 3J

Lumentum TOF VCSEL Product List for Consumer Market

6mil VCSEL


In-Cabin

Power Level 2.4W 4.6W

Operating Current Range 2.7A ~ 4A 4.5A~6.0A

Bond Pad Type Single Dual

Product Available Available Available

Power Level 100W 400W Matrix Addressable

Multi Junction Yes Yes Yes

Die size 1.5mm x 0.4mm 1.2mm x 0.96mm --

Wavelength 905 & 940nm 905 & 940nm 905 & 940nm

Product Available Available Available --

Driver monitoring & gesture recognition

LiDAR

Lumentum VCSELs for In-Cabin and LiDAR Solutions

High-Reliability High-Peak

Power VCSELs for LiDAR

High-Reliability VCSELs

for Automotive Applications

Short-range & long-range LiDAR


Applications : LiDAR scanning, cyberverse, entertainment, AR/VR, gesture sensing, 3D re-construction, etc.

Source : #HDC2019: Cyberverse - Rethink Real & Digital World

Source : https://www.theverge.com/2020/3/18/21185959/ipad-pro-lidar-scaner-augmented-reality-demo-hot-lava-game

https://www.imore.com/best-apps-lidar

More and More 3D Sensing Applications Unveiled

https://www.youtube.com/results?search_query=#HDC2019


Challenges to 3D Sensing Solutions

As Always…

Performance

Cost

多层结VCSEL设计与应用Multi-junction VCSEL design concept and the use case


The Motivations for Multi-Junction VCSEL Structure

Active junctions in series

Light

Output

top-DBR

bottom-DBR

GaAs substrate

Backside metal, cathode

anode

Oxide aperture

top-DBR

Light Emitting junction (diode)

bottom-DBR

Current

flow

Improved PCE less thermal load; less power consumption

Higher power density friendly to optics

Higher slope efficiency friendly to laser driver

Hundreds of watts power capability enhance working range & even to LiDAR distance

To reduce “Cost per Watt” for laser source

Adding junctions enables more photons to be generated from the same input current


Comparing 1J vs 3J VCSEL at i-TOF Mode

Maintain 1mm x 1mm VCSEL die size for consumer market

<1mm

<1mm

<1mm

<1mm

Single Junction Three Junctions

vs


Comparing 1J vs 3J VCSEL at i-TOF Mode (cont.)

Similar FF output profile

Leveraging existing i-TOF projector package and diffuser

Three JunctionsSingle Junction

vs


Multi-Junction VCSEL Also Excellent for dToF Mode

Multi-Junction LI Curves Continuous Pulsing, Low Duty Cycle (DC)

• 20 ns pulse width, 50°C chip temperature, varying duty cycle

可寻址VCSEL类型和演进方向Single-zone VCSEL upgraded to multi-zone VCSEL


The Motivations of Getting Addressable VCSELs

Advantages

Efficiently control the lighting area

Prevent signal interference

Better power consumption

Good thermal dissipation

Requirements

Need multichannel driver IC

Optics to support (Diffuser, CL, DOE, etc.)

Sensor and algorithm to support


Addressable are Very Much Flexible

1D Addressable Interleaved Addressable 2D Addressable

Contact

pad

Sub-array

Interleaved Array


Examples of VCSELs from Lumentum

1x8 addressable

multi-junction VCSELs

1x16 addressable

multi-junction VCSELs3x3 addressable

multi-junction VCSELs


High power density but low power consumption

Spot illuminator with high power density

– spot pattern (multi-zone)

Far field view

Spot PatternUniform Square beam

Diffuser

Addressable

VCSEL

8x8 emitters 1-zone

Paring with 1-channel driver IC

8x8 emitters 2-zone


8x8 emitters 8-zone


Tx Hardware design ( VCSEL component )

VCSEL Design Applies to iToF/dToF Driving Condition

Collimating

Lens

DCE

(3x3)

VCSEL

(multi-zone)


Multi-Junction and Addressable VCSELs for 3D Sensing

Performance

Longer sensing range

Lower power consumption

Reduced interference

Less thermal load

Flexible driving and detecting

Cost

Smaller size

Higher density

Lower cost on optics - lens and DOE

Smaller driver current LDD

New solutions, new features, new applications

Enabled by multi-junctions and addressable VCSELs

PerformanceCost


Summary

From 1 mW to 400 W VCSEL chips available from Lumentum

Offering both consumer-grade and automotive-grade VCSELs

High performance VCSEL design through multi-junctions

Flexible and various kinds of addressable VCSELs options

Combining multi-junction + addressable technologies together

All the above is ready to serve your new design

Thank you

用于3d传感的vcsel多层结与可寻址技术 - sensing$1.68b fy20* revenue >5500 employees...

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