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On-Chip Colliding Pulse Mode-locked laser diode (OCCP-MLLD) using multimode interference reflectors.

Carlos Gordón, Robinson Guzmán, Vinicio Corral

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    |June 16, 2015
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    Summary

    We achieved colliding pulse mode-locked (CPM) laser operation on a novel on-chip laser diode. This design doubles the repetition rate into the millimeter wave range, offering integrated pulsed output for photonic integrated circuits.

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    Area of Science:

    • Photonics
    • Integrated Optics
    • Semiconductor Lasers

    Background:

    • Mode-locked lasers are crucial for high-speed optical signal generation.
    • On-chip integration offers advantages in size, stability, and functionality.
    • Achieving stable colliding pulse mode-locking (CPM) on-chip presents fabrication and design challenges.

    Purpose of the Study:

    • To demonstrate a novel on-chip mode-locked laser diode (OCCP-MLLD) capable of CPM operation.
    • To leverage multimode interference reflectors (MIRs) for precise cavity length control and simplified saturable absorber placement.
    • To achieve doubled repetition rates in the millimeter wave frequency range with on-chip processing capabilities.

    Main Methods:

    • Fabrication of an on-chip laser diode using a generic InP foundry service and multi-project wafer (MPW) runs.
    • Implementation of a novel resonator structure utilizing multimode interference reflectors (MIRs) as end-mirrors.
    • Achieving colliding pulse passive mode-locking by positioning a saturable absorber at the resonator's center.

    Main Results:

    • Demonstration of colliding pulse passive mode-locking with sub-picosecond pulse widths (Δτ = 0.64 ps).
    • Achieved low timing jitter (σT = 75 fs) and amplitude noise (NAM = 0.012 dBc).
    • Successfully doubled the repetition rate, enabling operation in the millimeter wave frequency range.

    Conclusions:

    • The novel OCCP-MLLD design enables efficient CPM operation with enhanced performance metrics.
    • The use of MIRs simplifies fabrication and allows precise control for CPM regimes.
    • The integrated pulsed output on-chip facilitates further signal processing for advanced photonic applications.