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Improved performance of tunable single-mode laser array based on high-order slotted surface grating.

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    |May 14, 2015
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    Summary
    This summary is machine-generated.

    This study introduces an advanced tunable laser array using a novel grating design. The 12-laser array achieves a 36 nm tuning range with stable single-mode operation, ideal for optical communications.

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    Area of Science:

    • Photonics and Optical Engineering
    • Semiconductor Lasers
    • Integrated Optics

    Background:

    • Wavelength-tunable lasers are crucial for optical communication systems.
    • Existing tunable laser designs face challenges in achieving broad tuning range and stable single-mode operation.
    • High-order surface gratings offer potential for advanced laser functionalities.

    Purpose of the Study:

    • To present an improved design for a wavelength-tunable single-mode laser array.
    • To demonstrate a laser array with enhanced performance characteristics.
    • To validate the effectiveness of a high-order surface grating with non-uniformly spaced slots.

    Main Methods:

    • Design and fabrication of a 12-element slotted single-mode laser array.
    • Utilizing a high-order surface grating with non-uniform slot spacing.
    • Characterization of the laser array's tuning range, mode stability, and spectral linewidth over a temperature range.

    Main Results:

    • Achieved a quasi-continuous tuning range exceeding 36 nm across the C-band (10°C - 45°C).
    • All 12 lasers demonstrated stable single-mode operation with a side mode suppression ratio (SMSR) of 50 dB.
    • Obtained a spectral linewidth below 500 kHz for all operational channels.

    Conclusions:

    • The improved laser array design meets the demands for broad and stable wavelength tuning.
    • The modified slot design effectively ensures stable single-mode operation and high SMSR.
    • This device represents a significant advancement for tunable light sources in optical networks.