A 1550nm optical bandpass filter with a full width at half maximum (FWHM) of 30nm is a specialized optical filter that allows light within a narrow spectral range around 1550nm to pass through while blocking other wavelengths. This type of filter is commonly used in telecommunications and fiber optic networks, where 1550nm is the standard wavelength for transmitting information.

The bandpass filter helps to increase the signal-to-noise ratio of the transmitted data by reducing the amount of background noise that can interfere with the signal. The filter is also useful for separating different channels of information that are transmitted over the same fiber optic cable.

In addition to telecommunications, 1550nm bandpass filters with a 30nm FWHM may also find applications in spectroscopy, sensing, and biomedical imaging. For example, in biomedical imaging, near-infrared light in the 1550nm range is used to penetrate deep into tissue for non-invasive imaging and diagnostics.

Coligh’s stock standard 1550nm optical bandpass filter feature:

• Feature: SWIR bandpass filter
• Center wavelength: 1550±10nm
• Angle of incidence: 0°
• FWHM: 30±10nm
• Blocking range: 200-2500nm
• Blocking depth: OD4-OD6
• Transmission average: Above 90%
• Thickness：0.55mm, 0.5mm, 0.7mm, 1.0mm, 1.1mm
• Size: φ12.5mm, φ25.4mm, φ50mm

Custom option:

• Bandwidth:20nm, 40nm or any bandwith client request
• Angle of incidence: Depend on request
• Blocking depth: OD2. OD3, OD4
• Size: round or square smaller than 100*100mm
• Material thickness: Depend on request
• Transmission and blocking rang: custom as per requirement or between 200nm to 1500nm