Description
The fiber Fabry-Perot Scanning Interferometer is a lensless, plane Fabry-Perot interferometer with a single-mode optical fiber waveguide between two highly reflective multilayer mirrors that are deposited directly onto optical fibers. The cavity consists entirely of fiber waveguide, permitting an extremely wide range of possible Free Spectral Ranges (FSRs), and no alignment or mode-matching is required.

Wavelength scanning is achieved by axially straining a short section of fiber inside the cavity using a stacked piezoelectric actuator. Scanning frequencies to 100 Hz and higher can provide direct measurement of transient optical phenomenon such as laser chirp and jitter. Stable and repeatable scanning over longer periods of time can provide direct measurement of slowly varying optical phenomenon such as laser drift.

For driving the FFP-SI, the FFP Controller (FFP-C) provides simple electrical signals for wavelength scanning and wavelength selection in either open or closed-loop mode. Many spectral measurements can be made using only an FFP-SI, FFP-C and oscilloscope. Also, the FFP-SI can be cascaded with other FFP-SIs or FFP-TFs to provide ultrahigh finesse values.

In general, FFP-SIs are sensitive to the input polarization of the optical signal. Since polarization properties of the FFP-SI are stable, an input polarization controller can be used to tune to one polarization or to perform polarization analysis. For applications where polarization sensitivity may be undesirable, FFP-SIs incorporating polarization maintaining fibers are available (Option 020).

Features
• High Direct Optical Resolution
• Low Fiber-to-Fiber Insertion Loss
• Convenient Wavelength Locking
• No Alignment Required
• Small Footprint
• Shock Resistant
• Wavelength Ranges from 1480 to 1620 nm

Applications
• Ultra High Resolution Laser Analysis
     - Linewidth
     - Mode Structure and Stability
     - Wavelength Chirp
     - Jitter and Drift
• Ultra High Resolution Spectroscopy
     - Chemical Analysis
     - Emission or Absorption Lines
• Laser Mode Control and Selection
• Tunable Fiber Lasers
• Polarization Analysis