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
© 2020 Lumentum Operations LLC 3
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
© 2020 Lumentum Operations LLC 4
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
© 2020 Lumentum Operations LLC 5
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
© 2020 Lumentum Operations LLC 6
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
© 2020 Lumentum Operations LLC 7
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
© 2020 Lumentum Operations LLC 8
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
© 2020 Lumentum Operations LLC 10
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
© 2020 Lumentum Operations LLC 11
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
© 2020 Lumentum Operations LLC 12
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
© 2020 Lumentum Operations LLC 13
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
© 2020 Lumentum Operations LLC 15
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
© 2020 Lumentum Operations LLC 16
Addressable are Very Much Flexible
1D Addressable Interleaved Addressable 2D Addressable
Contact
pad
Sub-array
Interleaved Array
© 2020 Lumentum Operations LLC 17
Examples of VCSELs from Lumentum
1x8 addressable
multi-junction VCSELs
1x16 addressable
multi-junction VCSELs3x3 addressable
multi-junction VCSELs
© 2020 Lumentum Operations LLC 18
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
Paring with 2-channel driver IC
8x8 emitters 8-zone
Paring with 8-channel driver IC
Tx Hardware design ( VCSEL component )
VCSEL Design Applies to iToF/dToF Driving Condition
Collimating
Lens
DCE
(3x3)
VCSEL
(multi-zone)
© 2020 Lumentum Operations LLC 19
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
© 2020 Lumentum Operations LLC 20
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