The central wavelength is 1570nm+/-2nm, which accurately matches the L-band of optical fiber communication, the absorption peak of methane gas at 1572.3nm and the application requirements of laser radar.
The half-bandwidth is 10+/-2nm, and it transmits in the 1565-1575nm area. The extremely narrow band design effectively isolates the interference of adjacent channels.
The transmittance of the transmission band is greater than or equal to 90%, ensuring efficient signal transmission and reducing energy loss.
The ultra-wide cutoff band, with a cutoff depth of OD4 from 200-1700nk, significantly suppresses stray light interference.

1570/10 Thin Film Interference Filter Technical Datasheet

Parameter	Specification
Center Wavelength (CWL)	1570 nm ± 2 nm
FWHM	10 nm ± 2nm
Peak Transmission	≥ 90%
Blocking Range	200 – 1700nm
Optical Density (OD)	OD4
Angle of Incidence (AOI)	0°
Clear Aperture	>90% of the diameter
Substrate Material	UV Fused Silica, K9,sapphire, Other optical glass
Size	Ø12.7mm, Ø25.4mm,Ø50.8mmor customizable
Environmental Durability	Compliant with MIL-STD-810G
Other available wavelength	1570/10nm, 1570/20nm
Custom Option	EUV to 30,000nm
Filter Type	Multilayer Interference Bandpass Filter
Coating Technology	Ion-Assisted Deposition (IAD), Hard coated
Surface Quality	80-50, 60-40, 40-20 (per MIL-PRF-13830B

1570/10 Thin Film Interference Filter Applications

DWDM system
In dense wavelength division multiplexing (DWDM) systems, crosstalk between adjacent channels causes increased bit error rates. The 10nm bandwidth of the 1570/10nm bandpass filter accurately isolates the 1570nm channel, and the cutoff depth of OD4 suppresses interference from 1550nm and 1590nm. Improve signal transmission efficiency
Methane gas detection
Methane has a characteristic absorption peak at 1572.3nm, but ambient light noise masks weak absorption signals. The 10nm narrowband of the 1570/10nm filter matches the absorption peak to improve detection sensitivity.
LiDAR
The 1550nm laser is eye-safe but is easily affected by atmospheric scattering, limiting detection distance. The 1570nm band has stronger atmospheric penetration, and the 10nm bandwidth suppresses background noise