Picture of a coupler smaller than a penny!

Mini Coupler
Specs

915 and 916 Piezo Assemblies

Model 915 (Dual Wafer) Specifications:

Sensitivity:

Fiber with a 400 micron buffer - nominally* 0.01 micron per volt per fiber winding. Maximum 25 windings.

Fiber with a 250 micron buffer - nominally* 0.006 micron per volt per fiber winding. Maximum 40 windings.

(*stretch is dependant on buffer type, buffer adhesion to the fiber and the adhesive piezo to fiber)

Standard Driver:

Requires +/-15V DC regulated (lab) power supply.
Input +/-5V gives +/-25V (50V swing) output to piezo wafers.
Frequency response flat up to 20 kHz falling off to zero at 100kHz.

High Voltage Driver:

Available soon. Dimensions of Model 915 Piezo Assembly

Model	915	915(B)
Length	88.9mm	38.1mm
Width	38.1mm	50.8mm
Height	28.6mm	28.6mm
Fiber length/turn	175mm	216mm

915B Note: Larger mandrel size is used to reduce bend loss in some fibers.

Operation:

Fiber is stretched and compressed by piezo wafers elastically mounted on the sides of an oval form. The fiber is stretched only on the straight portion of the oval, to prevent bend induced cross coupling in PM fibers.

Model 916

The 916 piezo fiber stretcher, with up to 4mm stretch, has application to fringe scanning and delay lines. It is provided with a driver on a small PC card that can deliver up to +150 volts, continuously variable, to the piezo actuator. The input signal is factory set 0 to +5volts. The card requires power supplies +/- 15V DC @ 50mA, and +180 volts DC at 10mA. Frequency response is limited by the driver to 10Hz at full amplitude sweep and falls off approximately linearly to zero amplitude at 1kHz. Higher response is possible depending on waveform and duty cycle.

916 Preliminary Specifications:

Similar overall footprint to the 915 but using a center actuator to push the outer circular forms apart. Fifteen to twenty meters of fiber are used for 4mm stretch.

Graph: Triangle wave drive 0 to +150V: displacement is 0 to 50microns, 100ms period

Linearity and Hysteresis: Linearity at full swing is reasonable after an initial slow response, a triangle function exhibits a lower slope start from both peak and valley points.

The power supplies and driver have been incorporated into a controller unit, Model 914. A multiple controller, Model 914M, is also available to drive up to 4 devices.

Model	916	916(B)
Length	94.2mm	113.9mm
Width	31.8mm	44.5mm
Height	42.5mm	42.5mm
Fiber length/turn	202mm	246mm

916B Note: Larger mandrel size is used to reduce bend loss in some fibers.