Fixed Couplers

Coupler Arrays

Variable Ratio Couplers

Piezo Fiber Stretchers

Non-contact Displacement Sensor

Evanescent Access Blocks

Patch Cords

954 Fixed Ratio Evanescent Couplers and Taps

Manufactured using the same technique as the Model 954P fixed ratio coupler, but with SM non-PM fiber.  

Standard Ratio Tolerances (any ratio available)


Standard Tolerance Also Available
50/50 +/-3% +/-2%
   80/20 +/-2%


90/10 +/-1.5% +/-1%
99/1 +/-0.25%  






Available wavelengths: 

0.633 to 2.04um 

Operating Temperature: 

-15  to +55 degC 

Excess Loss: 

<0.1dB for wavelengths >980nm, <0.15dB for wavelengths 700 to 980, <0.2dB 633nm to 700nm 

Return Loss (Backreflection): 

-70 dB typical 

Power Handling: 

These very low loss couplers allow CW power approaching that of the fiber itself. 

The only restrictions we have noted is very high peak power, picosecond and femtosecond pulses that cause non-linear changes in the fiber that increases loss due to reduced guidance. 

Packaging & Sleeving: 

No sleeving over fiber (coupler unpackaged) dim. 0.59" x 0.1" x 0.1" 

Pigtails sleeved in 900 micron HYTREL (coupler in aluminum tubing) dim. Length 1.125" x Dia. 0.19" 

Pigtails sleeved with 3mm cable (coupler housed in 2.5" x 2.5" aluminum package) 


1 m standard length (longer available - up to 20m in 3mm sleeved configurations)