NEWTON: NEw Widely Tunable lasers for Optical Networks
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Transcript of NEWTON: NEw Widely Tunable lasers for Optical Networks
NEWTON:NEw Widely Tunable lasers for Optical Networks
Main Objective:To develop and experimentally investigate new types of widely tunable laser diodes.
Consortium
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• Interuniversity Micro Electronics Centre
(IMEC)
• Intune Technologies Ltd.
• ADC Inc.
• Technical University Munich
Technical Approach (1)
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reflector 1
Top view
Cross sections
n-InP n-InP n-InP
p-InP p-InP
n-InP
p-InP p-InP
• Sampled Grating Y-branch laser
gain
common phase section
MMI
differential phase section reflector 1
reflector 2
front facet
windows
MMI
bends
Technical Approach (2)
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• Sampled Grating Tunable Twin-Guide laser (SG-TTG laser)
I1t I 2t
IaI
a
It
n-InP
p-InP
p-InP
gratingp-InP
g2Lg1 L
active
tuning
grating
Longitudinal/tranverse structure Cross section
Technical Approach (3)
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• Sampled Grating Ring Resonator laser
activesection
phase control
reflector
ring resonato
r
Top view
Achievements/ Results I
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•The additive Vernier effect gives a high rejection of neighboring reflection peaks, compared to the multiplicative Vernier effect used in the SSG-DBR laser.
Design of Sampled Grating Y-branch laser:
188 190 192 194 196 198 2000
0.10.20.30.40.50.60.7
f (THz)
R
188 190 192 194 196 198 2000
0.1
0.2
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f (THz)
R
188 190 192 194 196 198 2000
0.10.20.30.40.50.60.7
f (THz)
R
188 190 192 194 196 198 20000.10.20.30.40.50.60.7
f (THz)
R
(a) (b)
(c) (d)
630GHz 700GHz
Multiplied specra
Added specra
Modelling/Design of SG-TTG laser:Very strong mode rejection when Bragg peaks from two sections overlapand very simple tuning scheme.
Achievements/ Results II
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Wavelength vs. tuning currents Side mode rejection