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"Nova" SMA
 
Home / Products / COMPONENTS / Connectors / Power Product Range/ "Nova" SMA
 
 
Introduction

Injection of high optical power from lasers into fibers is a problem with standard connectors.
Slight misalignment, non optimised focus point, poor spot quality are causes of fiber and connector destruction. 
Standard connectors with epoxy around the fiber up to the optical face are burning easily.
For high power injection the fiber end must not be in contact with epoxy or metal.
Consequently several connectors solutions have been developed derived from the SMA standard (protruding fiber, window, etc.)

The SEDI-ATI’s "NOVA" SMA with “free end and copper ferrule” is the result of a long cooperation between laser manufacturers and our R&D department.

   
 
 

Design

The specific "Nova" SMA connector is fully compatible with the SMA standard interface and consequently with the mechanical parts of the lasers using SMA bulkheads.
The idea is to keep a free space around the fiber end to dissipate heat and energy non focused in the fiber core. The fiber is centered by a long hole drilling precision positioned 2mm in recess of the front face.

Note : Using the "Nova" SMA connector is not sufficient to solve the problem of high power injection. The most difficult part is the way to assemble the connector to the fiber (end face quality, stress, gluing, cable retention, etc.).
Consequently this connector is not proposed as a discrete component but only assembled (pigtailed or as patchcord).
 
 
 

Assembly

• Optical face : they can be polished or cleaved.
It is important to note that the highest power is reached with cleaved end faces. 
Polished end faces even very carefully made have small scratches due to the abrasion process. Not perfectly transparent they burn more easily when high power is injected.
The cleaving process on the contrary creates an optical end face which follows the molecular structure of silica and offers better transparency.
Our assemblies are consequently made by cleaving on all fibers from 200μm to 600μm. For bigger fibers the polishing process is used.
The optical end face is situated in the same position than a standard SMA connector.

• Retention : a distinction must be made between the retention of the connector to the fiber and the retention of the connector to the protection tube (cable, metal, etc.). Both can generate stress on the fiber and consequently a hot spot which will eventually burn the fiber. The retention systems are a trade-off between the pulling force which can be applied to the assembly and the maximum stress acceptable by the fiber.

• These high power assemblies can be made with 200μm to 1000μm fibers
 
 
 
 

DATASHEET

 
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91080 Courcouronnes - FRANCE
+33 1 69 36 64 32

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