Fiber phase shifter

Fiber Phase Shifter

The FPS-002 is an all fiber device that shifts or modulates phase by up to 75π at frequencies from DC to 20 kHz.

Product Description

The FPS-002 is a small, piezo-driven phase shifter that works by stretching a length of fiber. It has a lower half- wave voltage than the FPS-001 (~2V compared to 10-20V). Like the FPS-001, it is an all fiber design and offers the benefits of low loss and back reflection. Two different size packages are available to accommodate the bend diameter requirements of different fibers.

  • Key Features
    • Small half-wave voltage
    • Low IL, PDL, and residual amplitude modulation
    • Frequencies up to 20 kHz
    • Compact
  • Specifications
    Frequency range 0-20 kHz
    Total phase shift range (500 Hz) >65π (1550nm)
    Half-wave voltage (500 Hz) 2.5-4.5V (small frame)
    0.7-1.5V (large frame)
    Resonance frequency 8-14 kHz typical
    Half-wave voltage (resonance) 0.1-0.5V typical
    Fiber type

    SM: 1310/1550nm: Corning ClearCurve ZBL or equiv.

    1060nm: Corning HI1060 or equiv.
    780nm: Nufern 780HP or equiv.
    PM: 1550nm: Bend insensitive PM with MFD=6.5μm
    1310nm: Bend insensitive PM with MFD=6.0μm
    1060nm: Nufern PM 980XP or equiv

    IL <0.5 dB (at λ c , excluding mode coupling loss and connectors
    PDL SM: <;0.05 dB (excluding connectors)
    PM: <0.1 dB (excluding connectors)
    Residual amplitude modulation ±0.01 dB (1550nm)
    PER PM: >18 dB, with connectors
    Internal fiber length
    (fiber inside enclosure)
    36 ± 2 cm (small frame)
    93 ± 2 cm (large frame)

    For full specifications, please download the data sheet.

  • Documentation

Solutions and Applications

The FPS-002 is useful for phase shifts of up to several tens of π at frequencies up to 20 kHz. Especially when used at resonance, the Vπ is very small, so it can be driven by a function generator. It can be used for fine adjustment or to add a dither in interferometric applications.

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