Product information "BTF-11 Manually Adjustable Variable Bandwidth Tunable Filters"
Polarization Insensitive; 1100 to 1650 nm; Bandwidth 1 to 18 nm; Insertion Loss 3 dB; PDL <0.3 dB; Fiber Type SM, PM; Connector Type FC/PC, ST, SC, LC, MU, None
OZ Optics’ BTF-11 series of manually adjustable variable bandwidth tunable filters are pigtailed components with adjustment knobs that allow both the wavelength and bandwidth of the filter to be controlled.
The devices contain two independently variable tunable bandpass filters in series. With the two filters tuned to cover slightly different wavelength ranges, the overall passband becomes the region where the two individual passbands overlap. The amount of overlap determines the width of the filter. Since each filter can be tuned over a range of wavelengths, both the center frequency and width of the passband can be controlled.
Each individual filter consists of a multi-layer thin film band pass filter, designed to give a flat top pass band, with steep roll-off shapes. The center wavelength of the filters is adjusted by changing the angle of incidence of the light as it impinges upon the filter. In the BTF-11 series of variable bandwidth tunable filters, each filter is independently rotated relative to the incoming light, in order to change the passband.
OZ Optics uses a special technique to minimize polarization dependencies, allowing PDL effects to be kept below 0.3 dB, and making the spectral response virtually polarization independent. This feature makes the BTF-11 series ideal for today’s DWDM system applications.
Variable bandwidth tunable filters using single mode (SM) and polarization maintaining (PM) fibers are offered. In general, OZ Optics uses polarization maintaining fibers based on the PANDA fiber structure when building polarization maintaining components and patch cords. However, OZ Optics can construct devices using other PM fiber structures. OZ Optics also carries some alternative fiber types in stock, please contact AMS Technologies for availability. If necessary, OZ Optics is willing to use customer supplied fibers to build devices.