T&S’s TFF-based FWDM (Thin-Film Filter Wavelength Division Multiplexer) enables simultaneous transmission of 1310nm (upstream), 1490nm (downstream), and 1550nm (CATV/RF overlay) signals over a single fiber, achieving ≤0.6dB(Typical 0.4) insertion loss (Port 1 to 2) or 0.5dB(Typical 0.3) insertion loss (port 2 to 3). Utilizing thin-film filters with 0.01nm wavelength tolerance, this device supports GPON Class B+ systems and 10G EPON architectures. The housing ensures Telcordia GR-1221-CORE compliance, with operational stability from -40°C to +85°C. Ideal for FTTx OLT/ONT integration and hybrid fiber-coaxial (HFC) network upgrades.
| Parameter | Unit | Specification |
| FWDM3/45 | FWDM45/3 | FWDM35/4 | FWDM5/34 |
| Operating Wavelength | Transmission | nm | 1490±10 | 1310±40 | 1490±10 | 1310±40 |
| nm | 1550±10 | 1490±10 |
| Reflection | nm | 1310±40 | 1490±10 | 1310±40 | 1550±10 |
| nm | 1550±10 | 1550±10 |
| Port of Transmission | Insertion Loss | dB | ≤0.6(Typical 0.4) |
| (Port1=＞Port2) | Isolation | dB | ≥40 |
| Port of Reflection | Insertion Loss | dB | ≤0.5(Typical 0.3) |
| (Port1=＞Port3) | Isolation | dB | ≥15 |
| Return Loss | dB | ≥45 |
| Insertion Loss Thermal Stability | dB/℃ | ≤0.005 |
| Polarization Dependent Loss | dB | ≤0.15 |
| Polarization Mode Dispersion | Ps | ≤0.10 |
| Directivity | dB | ≥45 |
| Power Handling | mW | 300 |
| Operating Temperature | ℃ | -40 ~+85 |
| Storage Temperature | ℃ | -40 ~ +85 |
| Fiber Type | -- | Corning SMF-28 Ultra, G657A1/A2 or customer specified |
| Pigtail type | -- | Ø250μm Bare Fiber or Ø0.9mm loose tube |
| Fiber length | m | 1.0, or customer specified |
| Package Dimension | mm | Steel Tube: |
| Ø5.5x34 for 250μm bare fiber, |
| Ø5.5x38 for Ø0.9mm loose tube; |
| Glass Tube: |
| Ø4.0x26 for Ø250μm bare fiber, |
| Ø3.2x26 for Ø250μm bare fiber; |
Note:
Insertion Loss excluding connector loss. With connectors add 0.3dB;
Connectors can be supplied on request.
The FWDM device with other operating wavelength can be customized.
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