Narrowband Tuneable Filter

Narrowband Tuneable Filters of WLTF-NM- & WLTF-NE- series are built based on free-space optical Fourier transformation combing with diffraction grating. Patent-pending optics design offers great options of bandwidth with unprecedented low insertion loss and polarisation dependent loss (PDL). Precise tuning mechanism enables filters to provide high wavelength resolution and repeatability.
Both of manual and electric version filters are available over X-, O-, S-, C-, & L- bands. Wavelength-tuning is actuated by either a precise micrometer driver or a built-in micro motor connected to a PC through a USB (I²C or SPI) interface in which actuation is monitored by a built-in encoder and controlled dynamically in a closed-loop. Motor control software is provided.

Features

• Operating range available over X-, O-, S-, C- and L-bands
• Up to 200nm wavelength tuning range
• Unprecedented low insertion loss and PDL
• High optical power handling
• Acc

urate and uniform bandwidth over whole tuning range

Down to 0.1nm FWHM bandwidth

High out-band suppression

Customised versions available on request

Applications

• ASE noise suppression
• DWDM channel filtering
• WDM wavelength tuning
• Pulse shaping
• FBG sensor interrogation
• Tuneable fibre lasers