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10 Gb/s EA Modulator Integrated DFB LDs Eye Diagram BER Performance 2023/1/17 13 State Key Lab on Integrated Optoelectronics Wavelength Tunable/Selectable LDs ? Advantages – Ability to restore failed channels – Reduced transmitter cost – Increased flexibility for future work managing ? Wavelength Tunable vs. Wavelength Selectable – Wavelength Tunable LDs:Based on DBR structures ? Compact device structure ? Poor reliability Electric crosstalk at high frequency – Wavelength Selectable LDs: Based on DFB LD arrays ? Relatively plicated device structure ? Improved reliability and wavelength stability 2023/1/17 14 State Key Lab on Integrated Optoelectronics Multirange Wavelength Selectable LDs ? For use in backup adddrop in DWDM photonic work ? DFBLDs integrated with MMI coupler, SOA, and EA modulator ? Compact size (400 ?m ? 2840 ?m) 2023/1/17 15 State Key Lab on Integrated Optoelectronics MultiRange Wavelength Selectable LD Arrays for DWDM Systems ? 15 nm/chip wavelength selectable range Wave