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Monolithically integrated 2.5  GHz extended cavity mode-locked ring laser with intracavity phase modulators.

Sylwester Latkowski, Valentina Moskalenko, Saeed Tahvili

    Optics Letters
    |December 23, 2014
    PubMed
    Summary

    A novel photonic integrated circuit demonstrates a mode-locked extended cavity quantum well ring laser operating at 1.58 μm. This device, built with InP technology, achieves a 2.5 GHz repetition rate, paving the way for advanced optical applications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Mode-locked lasers are crucial for high-speed optical communications and signal processing.
    • Extended cavity lasers offer enhanced spectral control and tunability.
    • Photonic integrated circuits (PICs) enable miniaturization and mass production of optical devices.

    Purpose of the Study:

    • To present a mode-locked extended cavity quantum well ring laser integrated on a photonic chip.
    • To demonstrate passive and hybrid mode-locking operation with wavelength tunability.
    • To achieve a high repetition rate (2.5 GHz) at a relevant telecommunication wavelength (1.58 μm).

    Main Methods:

    • Fabrication of the laser using InP-based active-passive integration technology.
    • Inclusion of gain, saturable absorption, passive waveguide, and phase shifter sections within a 33 mm long cavity.
    • Experimental demonstration of passive and hybrid mode-locking, and wavelength tuning.

    Main Results:

    • Successful realization of a mode-locked extended cavity quantum well ring laser on a PIC.
    • Demonstration of both passive and hybrid mode-locking regimes.
    • Observation of wavelength tuning capabilities for the laser modes.
    • Generation of a beat signal with a 3 dB bandwidth of 6.1 kHz in the passive mode-locking regime.

    Conclusions:

    • The presented InP-based PIC successfully integrates a mode-locked extended cavity quantum well ring laser.
    • The device exhibits versatile mode-locking capabilities and wavelength tunability, suitable for advanced photonic applications.
    • This work contributes to the development of compact and high-performance laser sources for optical systems.