widely tunable laser source for gas sensing applications• 4 tunable lasers on a single pic chip...

Widely tunable laser source for gas sensing applications

Citation for published version (APA):Latkowski, S., & Bente, E. A. J. M. (2015). Widely tunable laser source for gas sensing applications. InPhotonics Event 2015, June 3-4 2015, Veldhoven, The Netherlands

Document status and date:Published: 01/01/2015

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Download date: 25. May. 2021

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Widely tunable laser source for gas

sensing applications

Sylwester Latkowski, Erwin Bente

Photonics Event 2015, Veldhoven

04 June 2015

Outline

Slide: 2

• Motivation – laser gas detection

• Tunable laser - AMZI based l filter

• Simulations

• Photonic Integrated Circuits

• Experimental results

• Summary

04/06/2015 Photonics Event 2015

Laser gas detection system

Slide: 3

Source Gas interaction region Detection

SMF

SMF

-20 GHz +20 GHz l1

PD1


Laser requirements - gas sensing

• Central frequency/wavelength: fc 100 of MHz (lc 1 pm)

• Swing range 1GHz ~ 30GHz

• Switching/tuning speed: s or less

• Optical linewidth ~MHz

• Average optical power ≥ 1 mW (more -> better)

• 4 tunable lasers on a single PIC chip

• Long wavelength laser ~2µm

Slide: 4 04/06/2015 Photonics Event 2015

PIC

1.546 1.548 1.550 1.552 1.5540.0

0.2

0.4

0.6

0.8

1.0

Tra

nsm

issio

n [

arb

. u

nits]

Wavelength [m]

1.546 1.548 1.550 1.552 1.5540.0

0.2

0.4

0.6

0.8

1.0

Tra

nsm

issio

n [

arb

. u

nits]

Wavelength [m]

Intracavity AMZI l filter

PM

PM

L1

PM

PM

PM

PM

L2 L3

1.546 1.548 1.550 1.552 1.5540.0

0.2

0.4

0.6

0.8

1.0

Tra

nsm

issio

n [

arb

. u

nits]

Wavelength [m]

Slide: 5

g(l)

R R


SOA

COBRA active-passive

Slide: 6

InP Generic Photonic Integration Technology

SOA

(gai

n se

ctio

n)

Phase

mod

ulat

or

Shallo

w etc

hed

wav

egui

de

Dee

p et

ched

wav

egui

de

Polar

izat

ion

rota

tor

Linear laser

Tunable laser

Ring laser

Pulsed laser

Multiwavelength

laser

a) b) c)Optical amplifier

Phase modulator

Polarization

rotator

Waveguide

MMI coupler

On-chip reflector

Wavelength

(de)multiplexer

j

SOA

P

MMI

R

• M. Smit et al. “An introduction to InP-based generic integration technology,”

Semicond. Sci. Technol., vol. 29, no. 8, Jun. 2014.

• SMART PHOTONICS B.V. http://www.smartphotonics.nl/

• JePPiX http://www.jeppix.eu


Slide: 7

Ring laser with three AMZI filters

LRING = 16mm (FSRRING=5GHz)

LSOA = 1mm

Lf = 2mm (V2π = 12 Volt)

L1 = 1300µm (~88GHz)

L2 = 89µm (~1THz)

L3 = 9µm (~9THz)

COBRA InP active-passive


AMZI1 (L1) AMZI3 (L3)AMZI2 (L2)

ERM2

SOA

AR

1x2

ERM4

2x1

ERM6

ERM5ERM1 ERM32x1 1x2 2x1 1x2

2x2

MIR

ou

tpu

t

Slide: 8

Ring laser with AMZI filter – simulations

• Photonic circuit simulator PICwave

• Time domain – travelling wave

• SOA gain data from experiment

Simulation results (PicWave)

-20 -15 -10 -5 0 5 10 15 20-90

-80

-70

-60

-50

-40

-30

-20

-10

0

No

rmal

ised

inte

nsi

ty (

dB

)

Wavelength offset (nm)


3.65 mm

0.9

mm

ou

tpu

t

SOA

1 mm

AMZI1

AMZI2

AMZI3

2x2 MMI MIR

1.9 mm

ou

tpu

t

Tunable ring laser – chip

Slide: 9

SMART MPW 09


0 20 40 60 80 100 120 1400.0

0.2

0.4

0.6

0.8

1.0

1.2

ISOA

(mA)

Op

tica

l po

wer

(m

W)

0.0

0.3

0.6

0.9

1.2

1.5

1.8a)

VSO

A (V

)

LI – curve

Slide: 10

ITH=68mA (JTH=2.8kA/cm) @ 18oC


Single-mode operation

Slide: 11

-20 -15 -10 -5 0 5 10 15 20

Simulation Measurement


Laser linewidth – self heterodyne

Slide: 12

1990 1995 2000 2005 2010-110

-105

-100

-95

-90

-85

-80

-75

-70

-65

Pow

er

density (

dB

m/r

es)

Frequency (MHz)

OPT = 363 kHz (FWHM)

S-H parameters:

LDELAY = 25km → 8 kHz

ESA settings:

RBW=10kHz VBW=1kHz ST=1.9s

PIC:

ISOA=140mA, TWC=18ºC


Tuning range

Slide: 13

l = 74.3 nm

f = 9.4 THz

OSA settings:

Res = 0.1nm (12.5GHz)

PIC:

ISOA=140mA

TWC=18ºC

1472 1488 1504 1520 1536 1552

-60

-50

-40

-30

-20

-10

0204 202 199 197 195 193

Frequency (THz)

Po

wer

den

sity

(d

Bm

/res

)

Wavelength (nm)

74.3 nm

a)


-1.6 -0.8 0.0 0.8 1.6-10

-9

-8

-7

-6

-5

-4

-3

-2

-1

01520.074 1520.080 1520.086 1520.092 1520.098

Wavelength (nm)

Tran

smis

sio

nlo

g 12C

2H2 (

dB

)

Frequency (GHz)

0.89 GHz

(6.9 pm)

Fine tuning – 12C2H2 R-9 absorption line

Slide: 14

R-branch 9 C2H2

FWHMlog = 0.89GHz (6.9pm)

NIST FWHMlog~7.1pm (P-branch 9 line)

Laser

fTLS=6 MHz (lTLS=47fm)

ISOA=125mA, TWC=17.6ºC


4 x Tunable laser at 1.5µm

Slide: 15

• Four independent lasers

• MMI based combiner

• Three outputs

• On-chip wavelength tracking


Quad RsAMZI laser PIC – SMART MPW 09


Four lasers to one output - OSA


COBRA LW MPW run 01

• COBRA Active-passive

technology

• Strained MQW

• nanolab@TU/e

• TULGAS

• Paradigm

• LWAVE-TECH laser

• Ring Nested AMZI

Tunable laser at 2µm - COBRA LW MPW 01

Slide: 18 14/10/2014 LWAVE-TECH

Tunabale laser at 2µm - works!


Summary

Slide: 20

• New concept of widely tunable laser

• PIC at 1.5µm

• Record tuning range of 74nm

• Gas detection suitable

• 4 sources on one chip at 1.5µm

• PIC fully functional

• Fully functional PIC laser at 2µm

• Long-wavelength COBRA active-passive

• Tuning range of 25 nm


STW - LWAVE-TECH

Life Science Trace

Gas Facility


The End

Thank You!!!

Questions?

widely tunable laser source for gas sensing applications• 4 tunable lasers on a single pic chip...

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