The 1545 nm bandpass filter is a narrowband interference filter specifically designed for the (1530–1565 nm) range, allowing only light within 1545 nm±2 nm to pass through efficiently, while achieving deep blocking of OD4-OD6 on both sides. Typical specifications: center wavelength 1545 nm, bandwidth 10 nm (customizable from 1-50 nm), peak transmission ≥90%, operating temperature -40 °C to +85 °C, substrate made of low-expansion fused silica or calcium fluoride.

Process and Features
? Multi-layer ion beam sputtering (IBS) hard coating, dense film layer, temperature drift <0.02 nm/°C, laser damage threshold ≥5 J/cm2 (ns-level pulse);
? Quasi-rectangular spectrum, rectangularity ≥0.94, passband ripple <1.8%, effectively improving system signal-to-noise ratio.