Integrated Optical Wavelength Converters and Routers for ...

Integrated Optical Wavelength Converters and Routers for ...

Broadband Lateral Tapered Structures for Improved Bandwidth and Loss Characteristics for All-Optical Wavelength Converters Xuejin Yan, Joe Summers, Wei Wang, Marcelo Davanco, Wenbin Zhao, Milan Masanovic, Vikrant Lal, and Daniel Blumenthal Electrical and Computer Engineering University of California at Santa Barbara University of California Santa Barbara Chip-Scale WDM Program Summary of Work Objective: Develop building blocks to extend tuning range and decrease insertion loss of SOA XPM tunable wavelength converter to 30nm tuning range at 1.55m wavelength.

Approach: Monolithically integrate SOA wavelength converter with Mach-Zehnder structure with tunable laser using based-InP material. Major accomplishments: 1) Designed new type of broadband splitter/combiner for WC. 2) low loss and reflection connection of Active/passive structures have been designed for improving the quality of devices. 2) Splitter loss was measured to be better than MMI and Y-splitter over a wavelength range of 100nm. 3) Active XGM was demonstrated using this design. 4) A TWC has been designed and preliminary measurements are being taken. 5) Low reflection and low loss coupling techniques have been designed and fabricated: (i) a window design and (ii) a tapered mode converter University of California Santa Barbara Chip-Scale WDM Program Outline A.

B. Mach-Zehnder SOA wavelength converter with new waveguide structure. The splitter with lateral tapers The vertical coupler at the interface from active to passive waveguide The mode-shape converter with lateral taper and InP windows Active XGM results (first stage of wavelength conversion) Tunable wavelength converter (WC with integrated tunable laser). The structure of the TWC Progress for TWC C. Future work University of California

Santa Barbara Chip-Scale WDM Program Splitter and Combiner Waveguide layer InP Substrate University of California Santa Barbara Chip-Scale WDM Program N o rm a liza tio n o u tp u t p o w e r Wavelength Sensitivity of the Splitter 0.50 0.50

0.49 0.49 0.48 0.48 0.47 0.47 0.46 0.46 0.45 0.45 0.44 0.44

0.43 0.43 1.50 1.52 1.54 1.56 1.58 1.60 Wavelength(m) University of California Santa Barbara Chip-Scale WDM Program

Picture of the Splitter University of California Santa Barbara Chip-Scale WDM Program Near Field Image of Splitter Distance between two spots is 250 m University of California Santa Barbara Chip-Scale WDM Program The Spectrum of the Splitter with Integrated SOA -45 Intensity (dB m )

-50 arm1 arm2 SOA -55 -60 -65 -70 -75 1500 1520 1540 1560 1580

1600 Wavelength (nm) University of California Santa Barbara Chip-Scale WDM Program Active to Passive Vertical Transformer Active layer InP etching stop layer Waveguide layer InP substrate University of California Santa Barbara Chip-Scale WDM Program

The Vertical Coupler University of California Santa Barbara Chip-Scale WDM Program InP Window and Mode-Shape Converter InP window Lateral taper InP substrate University of California Santa Barbara Chip-Scale WDM Program The Function of InP Window

0 14 -10 12 10 -20 8 6 -30 4 2 -40 0 10 20

30 40 Lateral M ode Intensity 1/e R adius m ) ( R eflection Suppression (dB) 16 0 50 The Length of InP Window (m) University of California Santa Barbara Chip-Scale WDM Program Near Field Image of Splitter with 50m InP Window

22m 60m University of California Santa Barbara Chip-Scale WDM Program Gain Suppression of SOA -5 -5 -10 -10 B C -20 -25

August 15, 2002 -15 Gain Spectrum (dBm) Gain Spectrum (dBm) -15 (1,4_1SOA) I=190 mA -30 -35 -40 (1,4_1SOA) I=150mA -25 -30 -35

-40 -45 -50 1520 -20 August 15, 2002 B C -45 1540 1560 1580 1600 1620

1640 Wavelength (nm) Input light University of California Santa Barbara -50 1520 1540 1560 1580 1600 1620 1640

Wavelength (nm) SOA Output light Chip-Scale WDM Program 2.5GHz XGM eye diagram Probing wavelength =1560nm, pumping wavelength =1570nm. University of California Santa Barbara Chip-Scale WDM Program 5.0GHz XGM Eye Diagram Probing wavelength =1560nm, pumping wavelength

=1570nm. University of California Santa Barbara Chip-Scale WDM Program Progress for TWC SSG-DBR laser has been integrated into WC to reduce coupling loss Splitter dimensions have been increased to ease fabrication The first devices of TWC have been fabricated University of California Santa Barbara Chip-Scale WDM Program Wavelength Converter with Integrated SSG-DBR Laser University of California

Santa Barbara Chip-Scale WDM Program Future Work Measure and characterize the new TWC devices Optimize the processing and design of TWC Provide a high quality TWC device University of California Santa Barbara Chip-Scale WDM Program

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