Fiber Coupler (Splitter/Combiner) and Fused Fiber Optic WDM

Fiber Coupler (Splitter/Combiner) and Fused Fiber Optic WDM 2018-12-13T21:22:09+00:00
Fiber coupler (splitter/combiner) and fused fiber optic WDM route signals to their appropriate destination by splitting, combining or tapping optical signals/channels in a fiber transmission link. Employing a unique fiber fusing process, Lfiber is now able to fabricate and offer a wide variety of fused WDM couplers and fiber optic couplers with different product requirements (fiber types, operating wavelengths, handling power, connector types, package sizes, etc.).


Fiber Coupler and Fused WDM Coupler (Optical Beam Splitter/Combiner)
Singlemode/Multimode/Large-core Fiber coupler, Optical Splitter/Combiner
Fiber Optic Coupler and Fused WDM
Optical Coupler OM1 OM2 OM3 OM4 Multimode Fiber Coupler

Related Products: PLC Multimode Splitter (OM1/OM2/OM3/OM4)

Lfiber’s Fused Fiber Coupler and Fused Fiber Optic WDM

Fused Fiber Coupler (Optical Beam Splitter/Combiner)

The beam splitter/combiner forms the most common type of FBT (fused biconical taper) coupler-based branching components, which are widely used in fiber optic networks. A beam splitter/combiner is a symmetric fiber coupler with identical constituent fibers.
Lfiber’s fiber coupler (splitter/combiner) and WDM coupler are based on fused fiber and are made at our state-of-the-art fused biconical taper (FBT) facility. By using the FBT method, bare or etched fibers are brought into contact, stretched, sometimes twisted, and fused so that evanescent mode coupling occurs along the interaction length. All of our optical fiber couplers and fused WDM Couplers are Telcordia GR-1221/GR-1209 and RoHS compliant. They works well even in the outdoor application or harsh environment.

Tap Fiber Coupler

A tap fiber coupler is essentially an optical beam splitter/combiner with a desired splitting ratio, usually in the range of 1-50% (1/99 2/98 5/95 10/90 20/80 30/70 40/60 …). Such an optical fiber coupler permits passive add/drop of a signal at an optical network node. It’s usually used as power taps for monitoring the stability of an optical source, optimizing power budgets in optical networks, accessing Rayleigh backscattered signal from the test fiber in an optical time domain reflectometer (OTDR), monitoring signal level status in a fiber transmission link, and coupling at nodes in bus networks.

Single Mode Fiber Coupler

Lfiber’s single mode fiber coupler has precise operating wavelength and coupling ratio. This single mode fiber coupler can be designed to operate at a single wavelength (e.g. 1310 or 1550 nm), to be wavelength flat (e.g. insensitive to wavelength variations within a single window) or to be wavelength independent (e.g. insensitive to wavelength variations within both the second and third windows, 1260-1360 nm and 1450-1600 nm.

Visible/Infrared Light Single mode Fiber Coupler (Narrowband Single Mode Fiber Coupler)

Lfiber’s visible/infrared light single mode fiber coupler is a narrowband single mode fiber coupler. Visible and near-infrared (NIR) wavelengths are optional from 400 to 2000 nm on request, such as 405nm, 430nm, 450nm, 457nm, 460nm, 473nm, 488nm, 532nm, 630nm, 633nm, 635nm, 650nm, 780nm, 830nm, 850nm, 980nm, 1064nm, 1480nm, 1570nm, 1590nm, 1625nm, 1700nm, and 2000nm Also, its split ratios can vary from less than 1% to 50%.

Multimode Fiber Coupler and Large Core Fiber Coupler (Splitter/Combiner)

Lfiber’s multimode fiber coupler and large core fiber coupler (splitter/combiner) are available for all common multimode fibers with core diameters from 50 µm to 1500 µm (or even larger). They’re capable of operating over a broad wavelength range (i.e. 850nm and 1300nm, UV-VIS-NIR). These multimode and large core fiber couplers are mode-insensitive. We make effort to reduce the effects of higher order modes, for example, by decreasing the fiber cladding (OM1, OM2, OM3 and OM4 fiber) via etching method.

Fused Fiber Optic WDM Coupler (Wavelength Splitter/Combiner, Wavelength Selective Coupler, or Dichroic Coupler)

A fused fiber optic WDM coupler obtains light from two or more inputs with different wavelengths and feeds it into the same output fiber. When used in the reverse direction, the WDM coupler is capable of separating these wavelengths. This is used, e.g., for injecting pump light into a single-mode fiber amplifier. The transmission characteristics of a fused fiber optic WDM coupler are wavelength dependent, so it’s also called wavelength selective coupler, dichroic coupler, or wavelength combiner/splitter.


We also provide multimode pump coupler and UV-VIS-NIR fiber combiner, which combine two or more inputs at the same or different wavelengths into one fiber. The output fiber must usually support a larger number of guided modes, e.g., by having a larger core.

For product customization or special requirement, please contact our sales representatives.