A highly integrable, compact, reliable, and Low-WDL fiber-optic tap coupler

Shizhuo Yin, Purwadi Purwarsumarto, Wei Hong Su, Claire Luo

    Research output: Contribution to journalArticlepeer-review


    In this paper, a highly integrable, compact, reliable, and low wavelength dependent loss (WDL) fiber-optic tap coupler is presented. The coupler includes a single-fiber collimator at the input end, a grating beam deflector, a housing, and a specially designed dual-fiber collimator at the output end. One fiber of the dual-fiber collimator serves as the output channel and the other fiber serves as the tap channel. To minimize WDL induced by the wavelength-dependent diffraction efficiency of the phase grating, this dual-fiber collimator is carefully designed so that wavelength-dependent diffraction efficiency is largely compensated by the wavelength-dependent coupling efficiency of the dual-fiber collimator. A low WDL as small as 0.05 dB is achieved within the whole c-band region. The tap ratio can also be adjusted by controlling the modulation depth of the diffraction grating. Since this unique coupler can be easily integrated with other fiber-optic elements, such as variable optic attenuators (VOAs), it can be used to build a variety of fiber-optic modulates with integrated power monitoring capability.

    Original languageEnglish (US)
    Pages (from-to)166-170
    Number of pages5
    JournalMicrowave and Optical Technology Letters
    Issue number3
    StatePublished - Feb 5 2003

    All Science Journal Classification (ASJC) codes

    • Electrical and Electronic Engineering
    • Atomic and Molecular Physics, and Optics


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