Solid fundamentals, critical innovations

Filters & Lasers Technology

Charles Fabry and Alfred Perot coined the term etalon (a standard of weight or measure) to describe an optical cavity between two reflecting surfaces. Micron Optics has added a single segment of optical fiber within the original Fabry-Perot etalon and developed and patented a fiber Fabry-Perot (FFP) tunable filter. This all-fiber etalon contains no lenses or collimating optics and constitutes Micron Optics FFP Technology. All the powerful fundamental characteristics of the original invention is preserved, but with three critical advanced technical attributes:

  • Micron Optics FFP Technology has superior beam guiding technique within the cavity. The extreme alignment, temperature, and vibration sensitivities of the “old”, bulk-optic Fabry-Perot interferometers are gone.
  • Micron Optics FFP Technology has natural fiber connection compatibility unlike lenses or integrated waveguides, which encounter fundamental connection difficulties. The FFP platform is in the ranks of other commercial successful all-fiber components, including fiber couplers, Erbium-doped fiberamplifiers (EDFAs), and fiber Bragg gratings (FBGs).
  • Micron Optics FFP Technology is combined with the highest resolution mechanical positioning devices, Piezoelectric Transducers (i.e., PZTs), to position the mirrors in Micron Optics FFPs. PZTs are used in atomic force microscopes to position elements to subatomic dimensions. This level of mechanical resolution ensures stable, smooth, repeatable tuning of any FFP filter.

These three critical innovations allow the FFP optical response to truly follow the Airy function from the top of its low-loss peak down to the very bottom of its stop band, and to be smoothly and precisely controlled over all points in between.

Micron Optics’ Fiber Fabry-Perot Technology


  • Wide tuning range
  • High finesse
  • High resolution
  • Low loss
  • High contrast
  • Low reflection loss
  • Excellent Airy transmission profile
  • High power handling ability
  • High speed
  • Precise locking/tracking capability
  • Excellent thermal/mechanical stability
  • High reliability, field tested
  • Telecordia qualified: < 80 FITs


  • Enables the highest performance optical channel analyzer in WDM telecom systems.
  • Enables the designs of versatile tunable and swept laser systems.
  • Exhibits rapid tuning and locking capabilities, enabling channel selection and dropping applications in dynamic optical networks.
  • Is used in telecom systems around the world for optical noise filtering and dynamic channel locking, and has demonstrated extremely high reliability
  • Enables rapid optical component testing and spectrum analysis with wide dynamic range and high accuracy.
Which filter is right for your application?
  • FFP-TF and FFP-TF2 are used when fast, wide tuning is required
  • FFPI or AFPI is used when stability is more important than tuning
  • FFP-SI is used for very long cavity lengths (low FSR) when fast or wide tuning is important
Swept Lasers

The core of the Micron Optics’ high-speed swept laser incorporates a Semiconductor Optical Amplifier (SOA,) a high-performance FFP-TF, and the associated isolators and couplers to form a uni-directional ring laser. This unique design embodies the collective advantages of the SOA’s broad gain-bandwidth with direct modulation capability, and the Micron Optics FFP-TF’s wide tuning ranges (i.e., free spectral range (FSR) > 200 nm), high finesse (1000 to 10,000), low loss (80 dB.

When configured as a seed laser followed by post amplification, the swept spectrum and power can be optimized for high-sensitivity imaging, remote sensing, and nonlinear wavelength conversion applications. Furthermore, when combined with a dispersive element, the wavelength sweep can be converted into high-speed and wide-angle spatial scanning without moving parts. Depending on applications, the laser generally needs to be optimized to meet varying combinations of requirements including the sweep range, linewidth, power, speed, and center wavelength.