1. Dan Blumenthal, Leif Johansson, and Jon Getty
OEIC-WC Project Task 3
Larry Coldren, Leader
John Bowers, Jeff Henness, Jon Barton, Matt Sysak, James Raring, John Hutchinson (Intel), Hsu-feng Chou
With assistance from
Dan Blumenthal, Leif Johansson, and Jon Getty

2. OEIC Wavelength Converters: Direct Modulation
Pin
Pout
Det
Laser
Linear
Signal monitor
No filter required
Limited extinction
fmax ~ fR < 10GHz
Chirp & Loss +V
Pin
Pout
Laser
Det
SOA
Loss compensated
Linearity compromised +V
Pin
Pout
MAR Laser
Det
Loss compensated
Linear
Improved S/N
Henness

3. SOA-PIN Receiver Features
SOA-PIN – APD Comparison
PIN-SOA Coupling Efficiency = 100%
(Courtesy Joe Campbell) 10 20 30 40 50 60 70 80 5 15
EAM photocurrent (mA)
Input optical power (au)
High saturation power possible with Franz-Keldysh waveguide detector

4. OEIC Wavelength Converters: Ext. Modulator
Pin
Pout
Vd/m
-Vb
Pin
-Vb
Pout
Laser
Det
SOA
EAM or MZM
Vd/m
-Vb p n
Pdet
Pmod
Vd/m
Barton
Improved chirp
Good extinction
Loss compensated
2R without diodes
EAM & Mach-Zehnder
- Higher bandwidth with
traveling-wave or low R
-Vb p n
Pmod
Pdet
Chou
Vd/m

5. Expected Characteristics
Pout/Pin = hci GSOA hd hl/m hco ~ 1
Insertion Loss:
GSOA ~ 10 – 15dB
Bandwidth:
fmax = 1/fpara + 1/fdevice
fpara = 1/(2pRCT) = 30 GHz
; R = 5 W; C = 1 pF
fdevice = 1.5 fR = 8 GHz  fmax = 8 GHz
Direct Mod:
fpara = 1/(2pRCT) = 6 GHz
; R = 50 W; C = 0.5 pF
fdevice >> 6 GHz  fmax = 6 GHz (without travelling wave)
Ext Mod:
In-situ signal monitor: ~ 0dBm out to 50 W ;
10% of current assumed

6. Tasks/Milestones: Base period
OEIC-WC 15
Month
Development of Growth and processing technologies to fabricate integrated PICs with tunable lasers
Growth and processing procedure
Demonstration of directly modulated OEIC wavelength converter
Design details and dc & low frequency conversion efficiency and extinction ratio vs. wavelength
Delivery of direct-modulation OEIC-WC chip-on-carrier to DARPA designated government or FFRDC test facility
Delivery acknowledgement
Evaluation of Analog and Digital properties of Direct mod device
Conversion efficiency, NF and SFDR as a function of input wavelength, extinction ratio and BER at 2.5 Gbps
Study and assessment of alternative SOA and Detector designs for the Direct mod device
Study report including any promising new designs
Study and evaluation of saturable absorber and gain levered direct mod devices
Study report including simulations and the results of experiments on test structures
Design and simulation of various embodiments of PD/EAM and PD/MZI modulated WCs
Design and simulation results with integrated external modulators
Demonstrate electronic signal monitoring function
Study report including results of signal monitoring (SNR, linearity)