Santec OTF-930 Optical Tunable Filter

The Santec OTF-930 is a polarization-independent optical tunable filter employing Linear Sliding technology for precise wavelength selection across the C-band. It delivers continuous tuning from 1530–1610 nm with 0.01 nm resolution, wavelength accuracy better than ± 0.2 nm, and repeatability within ± 0.1 nm. The filter features a Gaussian spectral shape with typical -3 dB bandwidth of 5.5 ± 0.1 nm (single-stage) or 0.9 ± 0.1 nm (dual-stage configurations), insertion loss under 2.9 dB, and exceptional polarization stability: PDL < 0.2 dB and PMD < 0.1 ps.

Return loss exceeds 45 dB. Maximum input power rating is +20 dBm. When paired with a broadband source, the OTF-930 functions as a tunable light source with output power ranging from -20 to -30 dBm in standard configurations.

Available in single, dual, and triple-stage filter structures (08-S1, 08-S2, 12-S2, 03-S2) with FC/PC or SC/SPC optical connectors.

Technical Specifications

• Tuning Range: 1530–1610 nm


• Wavelength Resolution: 0.01 nm


• Wavelength Accuracy: < ± 0.2 nm


• Wavelength Repeatability: < ± 0.1 nm


• Filter Bandwidth (-3 dB): 5.5 ± 0.1 nm typical (single-stage); 0.9 ± 0.1 nm typical (dual-stage)


• Insertion Loss: < 2.9 dB maximum (single-stage); < 2.5 dB maximum (dual-stage)


• Polarization Dependent Loss: < 0.2 dB


• Polarization Mode Dispersion: 45 dB


• Maximum Input Power: +20 dBm


• Output Power (tunable source mode): -20 to -30 dBm


• Power Supply: AC 100–240 V, 50/60 Hz


• Power Consumption: 35 VA @ 230–240 V; 30 VA @ 100–120 V


• Dimensions: 210 × 80 × 300 mm


• Weight: 4 kg


• Operating Temperature: 20–30 °C


• Operating Humidity: < 80% RH (non-condensing)

Key Features

• Configurable as single (S1), dual (S2), or triple-stage (S3) filter


• GPIB (IEEE-488) and RS-232C control interfaces


• FC/PC and SC/SPC optical connector options


• Low PDL ensures minimal signal degradation in polarization-sensitive systems

Typical Applications

• ASE noise suppression in optical amplifiers


• Wavelength channel selection in WDM systems


• Optical component characterization and testing


• Spectral shaping for signal conditioning


• Incoherent light source configuration

Compatibility & Integration Programmable via GPIB or RS-232C with selectable addresses (00–30). Operates within standard laboratory temperature and humidity ranges. Accepts broadband optical sources to function as a wavelength-selectable light source.