THORLABS vytran LDC450B, Руководство пользователя

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LDC450B Large Diameter Cleaver Chapter 6: Cleaving
Page 12 TTN197399-D02
Chapter 6
Cleaving
6.1. Overview
The LDC450B cleaves fiber using the tension-and-scribe technique as follows:
1. A stripped fiber is secured in Fiber Holding Blocks (FHBs).
2. The left FHB moves to the left, tensioning the fiber.
3. A diamond-coated blade approaches the fiber and makes a small scribe.
4. The tension causes the scribe to propagate through the fiber, resulting in a cleave.
Figure 9 System Overview
This chapter provides an in-depth description of the manner in which fiber is cleaved using the LDC450B fiber
cleaver.
6.2. The Cleave Process
The cleaver utilizes two Fiber Holding Blocks (FHBs) to securely clamp and position the fiber prior to cleaving. The
left FHB has a linear drive mechanism for applying tension to the fiber. The right FHB is stationary. A load cell is
incorporated into the left FHB for monitoring fiber tension. Once the fiber is positioned and securely clamped in the
FHBs, an automated Cle
ave Process can be initiated by pressing the “Start” button.
Parameters that can be adjusted using the Handset Controller are shown below in bold . Descriptions of these
parameters are provided in section 7.3.1. The majority of Users will only need to set the Fiber Diameter (cladding),
Cleave Tension , and Pre-Cleave Advance while leaving the rest of the Parameters set to their default values.
The Cleave Process proceeds as follows:
1. The left FHB slowly pulls to the left until the specified Cleave Tension is reached.
2. While the fiber is held under tension, the diamond blade advances towards the fiber. After the blade has
traveled the
Blade Pre-Cleave Advance distance, it begins oscillating towards the fiber in small
back-and-forth steps. As soon as the diamond blade contacts the fiber it creates a small scribe, which
rapidly propagates through the fiber due to the pre-applied tension.
3. When the fiber is cleaved, the cleaver senses the drop in tension and immediately draws the cleave blade
back and the left FHB pulls further left to move the fiber held within it away from the waste piece.
These cleavers are configured such that the cleave “off-cut” (the piece of fiber that is discarded) is on the right. It is
possible to use the cleaver the ‘other way around’, such that the off cut is on the left hand side of the machine.
FHB Lid
Cleave
Blade
Fiber Holding
Block (FHB)
Micrometer
Backstop
Ruler Block
Lifting
Lever