Bandpass filter

TYPES AND CHARACTERISTICS

XENLUX fiber optical filters are based on micro-lens technology. With these components, a well defined range of the wavelength spectrum has optimized transmission properties while another range is largely suppressed or blocked. Many fiber optical sensor applications create wide and diffuse wavelength spectra which form the basis for a measurement signal. XENLUX fiber optical components filter those spectra to generate stable, readable and reproducible signals for further processing in the system. The individual filter specifications are calculated and defined based on the application. These fiber optical components allow applications with transmission bands of a few nm and sideband rejection in excess of 80dB.

We distinguish three types of filters:

• Short-pass filter:
  Only the short wavelength part of the spectrum is transmitted, long wavelengths are attenuated and blocked
• Long-pass filter:
  Only the long wavelength part of the spectrum is transmitted, short wavelengths are attenuated and blocked
• Band-pass filter:
  A combination of short-pass and long-pass filter in one fiber optical component. Only a small portion of the wavelength spectrum is transmitted, the side bands are attenuated and blocked

Main advantages are:

• Large degree of design flexibility
• Efficient insertion loss
• High return loss
• Small excess loss
• High thermal stability
• Compact housing dimensions