Fiber Fabry-Perot Tunable Filter

Key Features of the Mirega Fiber Fabry-Perot Tunable Filter

• Ultra-high finesse fiber Fabry-Perot tunable filter designed for demanding photonics, spectroscopy, sensing, metrology, and OEM optical filtering applications.
• Exceptional spectral selectivity with finesse values above 30,000 and custom OEM configurations available up to 60,000, enabling extremely narrow optical filtering and high wavelength discrimination.
• Wide free spectral range options from 300 GHz to 10 THz, supporting flexible filter design for narrowband optical analysis, laser cleanup, wavelength selection, and high-resolution spectral measurements.
• Narrow optical bandwidth performance from approximately 10 MHz to 3.3 GHz, depending on the selected FSR and finesse; for example, a 1.5 THz FSR with finesse >30,000 provides bandwidth below 50 MHz.
• Broad wavelength compatibility with standard center wavelengths including 800 nm, 1000 nm, and 1560 nm, plus custom OEM wavelength options covering approximately 500 nm to 2500 nm.
• Large operating wavelength window with a typical usable tuning range of ±100 nm around the center wavelength, enabling versatile integration into research and industrial optical systems.
• Fast tunable optical filter architecture with a first mechanical resonance frequency above 50 kHz, allowing rapid wavelength scanning and dynamic optical signal control.
• High extinction performance with transmission at extinction from -60 dB to -80 dB, providing strong rejection of unwanted spectral components and improved signal purity.
• Fiber-integrated Fabry-Perot cavity built with laser-machined fiber mirrors for compact alignment-free operation and efficient integration into fiber optic setups.
• Excellent wavelength discrimination for applications requiring precise optical filtering, laser line selection, spectral cleanup, tunable bandpass filtering, and narrow linewidth signal extraction.
• Compact and lightweight design with dimensions of approximately 10 x 4 x 3 cm and a weight of only 160 g, making it suitable for benchtop experiments, portable instruments, and OEM photonics modules.
• Standard FC/APC optical connections for low-back-reflection fiber coupling and compatibility with common laboratory and industrial fiber optic systems.
• Single-mode fiber interface supplied with 30 cm fibers and 900 µm jacket, simplifying integration into precision optical assemblies.
• Electrical drive compatibility with LEMO connector and BNC adapter, supporting convenient connection to standard control electronics and high-voltage drivers.
• Low capacitance actuator design with capacitance below 10 nF, supporting efficient high-speed tuning performance.
• Defined tuning voltage performance with approximately 320 Vpp per FSR and an absolute maximum tuning voltage of 740 Vpp.
• Output power range from 2 mW to 20 mW, depending on finesse, wavelength, frequency, and thermal operating conditions.
• Designed for high-resolution spectroscopy, including atomic, molecular, and laser spectroscopy where narrow bandwidth, high finesse, and wide FSR are critical.
• Ideal for fiber optic sensing and metrology where precise wavelength selection, tunable optical filtering, and high extinction are required.
• Suitable for telecom and near-infrared photonics, especially at 1560 nm, with custom options for additional wavelength bands.
• OEM-ready tunable filter platform with customizable center wavelength, finesse, and free spectral range to match application-specific optical system requirements.
• Ordering flexibility using the format FP-wwww-ffff-FF, where center wavelength, finesse, and FSR can be selected from standard available configurations.
• Reliable operating environment with specified operating temperature from 10°C to 35°C and storage temperature from -10°C to 55°C.
• Advanced patented technology based on more than a decade of academic research, delivering a compact, high-performance alternative to bulk tunable Fabry-Perot i

A Fiber Fabry-Perot Tunable Filter is a versatile optical device used in telecommunications and photonics applications to selectively filter and manipulate specific wavelengths of light. It consists of two highly reflective mirrors that are separated by a small gap, typically on the order of micrometers. These mirrors are coated onto the end faces of an optical fiber or waveguide, creating a resonant cavity.

The tunable aspect of this filter is achieved by altering the distance between the two mirrors, which changes the effective optical path length within the cavity. This causes constructive or destructive interference of specific wavelengths of light, resulting in transmission or reflection of those wavelengths. By adjusting the gap between the mirrors, the filter’s resonant frequency and bandwidth can be controlled, allowing for precise tuning of the transmitted or reflected wavelengths.

Fiber Fabry-Perot Tunable Filters find applications in wavelength-division multiplexing (WDM) systems, where they can be used to separate or combine different wavelengths of light in optical communication networks. They are also used in optical sensing, spectroscopy, and test and measurement setups where wavelength selection and manipulation are crucial. The tunability and compact size of these filters make them an essential component in modern optical systems that require dynamic control over the transmitted or reflected light spectrum.