High-Precision Red/Blue Optical Fiber Filters (Red/Blue Optical WDM Filters)
1. Product Overview
GRACYFIBER's Red/Blue Band Fiber WDM Filter is an optical wavelength management device based on high-performance thin-film filter (TFF) technology, designed for precise combining and splitting of multi-band signals over a single fiber. This filter comprehensively covers an ultra-wide spectrum of 1260–1620 nm, supporting not only Red/Blue band wavelength separation in the core C-band but also providing various classic wavelength combinations such as 1310/1550 nm, 1550/980 nm, and 1310/850 nm. Utilizing precision manufacturing processes for an all-fiber structure, this device features ultra-low insertion loss, high channel isolation, and extremely low polarization-dependent loss (PDL). Whether integrated into miniature optical modules or deployed in metropolitan area networks, FTTx access networks, or complex system-level optical test platforms, it ensures efficient routing and absolute stability of backbone traffic.
2. Product Features
| Parameter |
Unit |
Value |
| Operating Wavelength |
nm |
1260~1620 |
| Pass Band Wavelength |
nm |
Red (1547.4~1561) |
Blue (1530~1543.2 ) |
1550 (1528-1565) |
1310(1260~1360) |
| Reflect Band Wavelength |
- |
Blue( 1530~1543.2) |
Red (1547.4~1561) |
980 (965-995) |
850 (800~900) |
| Insertion Loss |
Max.Pass |
dB |
0.6 |
0.6 |
0.6 |
0.6 |
| Max.Reflect |
dB |
0.4 |
0.4 |
0.4 |
0.4 |
| Isolation |
Transmission |
dB |
≥30 |
≥30 |
≥30 |
≥30 |
| Reflection |
dB |
≥15 |
≥15 |
≥15 |
≥15 |
| Ripple |
Max |
dB |
0.3 |
0.3 |
0.3 |
0.3 |
| PDL |
Max |
dB |
0.10 |
| Return Loss |
Min |
dB |
40 |
| Directivity |
Min |
dB |
50 |
| Power Handing |
Max |
mW |
300 |
| Fiber Type |
- |
G67A1/ A2/ B3 or SMF-28 |
SMF-28&HI1060 |
SMF-28&OM1..OM5 |
| Fiber Coating |
um |
250 µm / 900 µm loose tube |
| Fiber Length |
mm |
1000 |
| Connector |
- |
LC/UPC or Customized |
| Dimensions (HxWxD) |
mm |
Φ5.5xL38, 90x20x10, 120x80x18, 155x129x29, 482x250x44 |
| Operating Temperature |
°C |
-5~65 |
| Storage Temperature |
°C |
-40~85 |
(Designed specifically to solve your pain points of crosstalk and multi-service coexistence in single-fiber bidirectional transmission)
Features: Precise red/blue band separation and flexible multi-band support
Solved Pain Points/Value: Capable of precisely separating the C-band red band (Red Pass: 1547.4~1561 nm) and blue band (Blue Reflect: 1530~1543.2 nm). This greatly unlocks the physical potential of single-fiber bidirectional (BiDi) DWDM systems, completely preventing Rayleigh scattering crosstalk in opposite-direction signals; simultaneously, it can also perfectly separate the 980 nm wavelength and 1550 nm signal wavelength used in EDFA pump lasers.
Features: Ultra-low insertion loss (Max 0.6 dB) and extremely low PDL
Pain points addressed/value benefits: Maximum transmission loss is strictly controlled at an extremely low 0.6 dB at both the transmission and reflection ends (only 0.4 dB at the reflection end). Combined with a maximum polarization dependent loss (PDL) of only 0.10 dB and in-band flatness (Ripple) of 0.3 dB, it saves you crucial optical power budget in long-distance cascaded networks and ensures polarization state stability of high-speed coherent signals.
Features: High channel isolation and superior directivity address pain points/value
Value: Transmit channel isolation up to ≥30 dB, reflective channel isolation up to ≥15 dB, and directivity up to ≥50 dB with return loss up to ≥40 dB. This forms a robust optical barrier, effectively filtering out out-of-band noise and residual pump light, significantly improving the optical signal-to-noise ratio (OSNR) at the receiver.
Features: Comprehensive compatibility with specialty optical fibers and high power handling capabilities
Pain points addressed/value: The device can handle input optical power up to 300 mW and is compatible with various optical fibers depending on the wavelength configuration: such as HI1060 specialty fiber for 980nm pumping, standard SMF-28 single-mode fiber, and even OM1~OM5 multimode fiber. This provides optical module and amplifier developers with "one-stop" low-level device-level support.
3. Applications
This filter is a key component for achieving fiber optic resource multiplexing and optical path protection:
- C-band Red/Blue Band Separation: Core frequency division node in single-fiber bidirectional (BiDi) DWDM systems and long-haul optical transmission backbone networks.
- Optical Amplifier and Laser System Integration: Efficiently combines 980 nm pump light and 1550 nm signal light in the EDFA.
- 1310/1550 nm Service Coexistence: Perfectly achieves lossless superposition of traditional data services and analog video signals on the same fiber.
- Hybrid PON and FTTx Access Networks: Manages and routes specific wavelengths of different generations of PON networks (such as GPON and XGS-PON).
- Optical Monitoring and Protection Paths: Separate specific monitoring wavelengths (e.g., 1625/1650 nm) in a system-level test platform.
