Single-Mode Fiber Output Lasers
What is Single-Mode Fiber?
Single-mode fibers (also single mode optical fiber, SMF, SM fiber, and monomode fiber) are designed to allow only one propagation mode (transverse mode) per polarization direction, retaining the fidelity of each light pulse over longer distances and providing higher bandwidth, when compared to multi-mode optical fibers.
Typically, a standard single-mode optical fiber has a relatively small core diameter between 8 and 10.5 µm, a cladding diameter of 125 µm, and a small difference in refractive index between the cladding and the core. Single-mode fibers are commonly comprised of a silica core and silica cladding, utilizing a step-index refractive index profile. The core, for example, would be doped to create the difference in index of refraction between the cladding and the core.
While the small core diameter does not allow for a great deal of power, it does allow only the primary transverse mode to be guided along the fiber. This primary mode subsequently travels down the fiber in an essentially straight line, and therefore, does not suffer from pulse spreading, which is common in multimode fiber because of varying path lengths. This allows for an increased bandwidth in a single-mode fiber, as the laser light travels the same distance at the same speed.
Another benefit, adding to the larger bandwidth, is the lack of intermodal dispersion in single-mode optical fibers. This fiber type is therefore able to transmit signals at longer distances while retaining the fidelity of each pulse of light when compared to multimode fibers. Single-mode fiber does suffer from some distortion of the signal. However, this distortion is mainly caused by chromatic dispersion and is very small compared to the modal dispersion inherent to multimode optical fiber. Furthermore, the utilization of the primary mode, along with higher wavelengths (≈ 1.3µm and ≈ 1.5µm) results in a low level of attenuation. The increased bandwidth, retained pulse fidelity, and low attenuation provides great benefits in optical fiber communication, for example, with high data rates transmitted over long distances.
Our Single-Mode Fiber Laser Products
RPMC Lasers is your Single-Mode Fiber Laser supplier! We offer a wide range of SM fiber output lasers, including Laser Diode Modules, CW DPSS Lasers, CW Fiber Lasers, Multi-Wavelength Beam Combiners, Single-Emitter Laser Diodes, Distributed Feedback (DFB) Lasers, Volume Bragg Grating (VBG) Laser Diodes, Superluminescent Laser Diodes (SLEDs or SLDs), and Turn-Key configurations. Among these options, we provide many wavelengths in the UV, violet, blue, green, yellow, red NIR, and SWIR spectral regions (and multiple wavelength output), many power options up to 500 mW (0.5 W), and narrow linewidth output options.