Fused Fiber Optic Couplers
What is Fused Fiber Optic Couplers?
Fiber optic coupler, is a device applicated in optical fiber systems with one or more input fibers and one or several output fibers.For the fused optical splitter,It can be divided into different ratios.such as 50/50 if the split is even, or 80/20 if 80% of the signal goes to one side and only 20% to the other.As a result of its great funciton,Optical splitter is a very important part in passive opitc networks (PON).FTB Fused fiber splitter (coupler) can do Singlemode (1310/1550nm) and Multimode (850nm).Cable diameter can be 0.9mm,2.0mm,3.0mm ,Single window,dual window and three window all we can supply .
Fused Fiber Optic Couplers
Singlemode Dual Window Couplers are Single Mode Splitters with a defined split ratio from one or two input fibers to 2 output fibers. Available split counts are 1×2 and 2×2 in split ratios of: 50/50, 40/60, 30/70, 20/80, 10/90, 5/95, 1/99, 60/40, 70/30, 80/20, 90/10, 95/5, and 99/1. Dual Window Couplers are availble with 0.9mmloose tube singlemode fiber or 250umbare fiber and terminated or unterminated as per your needs. UnconnectorizedDWC’s come with no connectors for easy splicing or connectorization. Connectorized DWC’s are available with your choice of Fiber Optic Connectors: LC/UPC, LC/APC, SC/UPC, SC/APC, FC/UPC, FC/APC, and ST/UPC.
Fused WDM module is based on Fused Biconical Taper (FBT) technology, it is used to combine and separate optical signals transmitted on different wavelengths. This function provides the first level of bandwidth expansion for a network by increasing a fiber’s signal carrying capacity. Fused WDM Modules may also be used to add additional functionality to the network such as network status monitoring. Our fused WDM Module provides a cost effective way to minimize loss and maximize wavelength isolation.
We provide two main types of Fused WDM module: Fused WDM used in optical fiber amplifiers, such as 980/1550nm, 1480/1550nm, 980/1060nm Fused WDM; Fused WDM module used in bi-directional or CWDM optical communication systems, such as 1310/1550nm WDM Module.
1310/1550nm Fused WDM Module
1310/1550nm Fused WDM Module can combine 1310nm and 1550nm signals into one fiber or separate 1310nm and 1550nm signals into two fibers in optical fiber system. It can be used to double the fiber transmission capacity or enable the bi-directional communication using one single fiber.
1310/1550nm High isolation Fused WDM Module
1310/1550 High isolation Fused WDM Module can combine 1310nm and 1550nm signals into one fiber or separate 1310nm and 1550nm signals into two fibers in optical amplifiers.
980/1060nm Fused WDM Module
980/1060nm Fused WDM Module can combine 980nm and 1060nm signals into one fiber or separate 980nm and 1060nm signals into two fibers. It is used for optical amplifiers
980/1550nm Fused WDM Module (Pump WDM)
980/1550nm Fused WDM Module can combine 980nm and 1550nm signals into one fiber or separate 980nm and 1550nm signals into two fibers. It is used for L-band EDFA.
1480/1550nm Fused WDM Module (Pump WDM)
1480/1550nm Fused WDM Module can combine 1480nm and 1550nm signals into one fiber or separate 1480nm and 1550nm signals into two fibers. It is used for C-band EDFA.
Fused Fiber Optic Couplers Overview
Fused fiber optic couplers are passive optical components used to split or combine light signals within fiber networks. They are manufactured using the fused biconical taper (FBT) process, ensuring low insertion loss and high reliability across telecom, data center, and CATV systems. Our FBT couplers are available in a variety of split ratios (50:50, 90:10, 70:30, etc.) for cost‑effective signal distribution and monitoring applications.
Main Applications
- Passive optical network (PON) splitter/monitor
- DWDM/ CWDM power distribution
- FTTH deployment and power balancing
- Optical test systems and monitoring
- Coarse WDM multiplexing and signal sampling
Key Features
- Fused biconical taper technology (FBT)
- Available configurations: 1×2, 2×2, 1×3, 1×4
- Wavelengths: 1310nm / 1490nm / 1550nm (optional 1625nm)
- Dual window operation 1310/1550nm
- Low insertion loss (<0.3dB typical)
- High uniformity (<0.15dB)
- Excellent polarization insensitivity
- Compact and rugged structure for field use
- Factory OEM / ODM availability
Operating Principle
The core fibers are thermally fused and tapered under precise control, causing optical power to redistribute between fiber cores by evanescent field coupling. This stable manufacturing process ensures excellent wavelength uniformity and long‑term durability, suitable for various network environments including harsh outdoor and high‑temperature applications.
Technical Specifications
| Parameter | Typical Specification |
|---|---|
| Configuration | 1×2 or 2×2 |
| Splitting Ratio | 50:50, 90:10, 80:20, customizable |
| Operating Wavelength | 1310/1490/1550nm or Dual Band |
| Insertion Loss | <0.3dB (50:50) |
| Uniformity | <0.15dB |
| Return Loss | >50dB |
| Directivity | >55dB |
| Fiber Type | SMF-28e or G.657.A1/A2 |
| Connector Type | LC/SC/ST/FC UPC or APC |
| Packaging | Steel tube (3x54mm), ABS or LGX module |
| Temperature Range | -40°C to +85°C |
| Compliance | Telcordia GR-1209, GR-1221, RoHS |
Reliability & Quality
Each fiber optic fused coupler is fully tested for environmental stability, mechanical strength, and optical performance. The couplers meet Telcordia standards and undergo 100% QC for insertion loss, return loss, and temperature cycling. OEM clients can request custom logo printing, branded packaging, and specialized ratio designs for unique network architectures.
Advantages for OEM & Projects
- Custom wavelength and ratio configurations
- Full batch testing reports provided
- Competitive factory pricing for integrators
- High compatibility with WDM/OADM/DWDM systems
- Direct manufacturer supply with short lead times
Typical Deployment Examples
Fused couplers are used for FTTH GPON monitoring, redundant signal paths in SDN networks, and power balancing in photonic sensor arrays. They perform consistently across spectrum bands, making them suitable for low-cost, field‑replaceable connections within fiber access networks.
Factory Supply Note
We manufacturer FBT fused couplers in both singlemode and multimode variants. Custom ratio designs (e.g., 98:2 for monitoring ports) are available upon order. OEM/ODM services include co‑branding, product labeling, and integration into splitter boxes or patch panels.
FAQ (Fused Fiber Optic Couplers)
1. What is a fused fiber optic coupler?
It’s a passive optical component that splits or combines light from one or more fibers using a fused biconical taper process.
2. What is FBT technology?
FBT (Fused Biconical Taper) technology involves fusing two fibers under heat and tension to allow controlled power coupling between them.
3. How is insertion loss measured?
Insertion loss measures how much light power is lost through the coupler during transmission; lower values indicate higher efficiency.
4. What are common splitting ratios?
Typical ratios include 50:50, 90:10, 80:20, 70:30 depending on system power needs.
5. Which wavelengths are supported?
Standard wavelengths are 1310nm, 1490nm, 1550nm, and optional 1625nm for monitoring channels.
6. Can fused couplers be bidirectional?
Yes, FBT couplers support bidirectional light propagation for multiplexing or splitting both directions.
7. What is directivity in fiber couplers?
Directivity measures isolation between coupled ports; high directivity (>55dB) prevents back‑reflection interference.
8. What is uniformity?
Uniformity represents how evenly the light is split across output ports; lower uniformity values mean better product quality.
9. What type of fiber is used?
We typically use SMF‑28e or bend‑insensitive G.657.A1/A2 fibers for improved performance.
10. Are connectors included?
Yes, LC/SC/ST/FC connectors in UPC or APC polish are available depending on request.
11. What materials are used for packaging?
Steel tube, ABS box, or LGX cassette packaging are available for various installation scenarios.
12. What standards do they comply with?
All couplers meet Telcordia GR‑1209, GR‑1221 and RoHS environmental standards.
13. Do you offer OEM branding?
Yes, factory OEM labeling and logo printing options are supported for B2B partners.
14. What temperature range can they operate in?
Fused couplers are rated for ‑40°C to +85°C for reliable outdoor and rack environments.
15. How can I order directly from manufacturer?
Visit mefiberoptic.com for OEM & wholesale pricing and direct factory supply of fused fiber optic couplers.
