Fujikura 43S Splicing Machines core alignment fusion splicer

The Fujikura 43S is a historic, high-performance core alignment fusion splicer that represented a significant technological step forward from the earlier 30-series (like the 31S/33S). It was a flagship model in the mid-2000s, designed for precision splicing in demanding FTTX and long-haul network applications.

1. Review & Historical Significance

The FSU 43S was part of the generation that bridged the gap between Fujikura's classic workhorses and the modern, streamlined 50S/60S series. It incorporated more advanced computing and optics while retaining the robust, reliable build quality the brand is known for.

• Era: Mid-2000s (circa 2005-2008). Now long discontinued and obsolete.

• Status: Found only on the secondary/used market. Official service and parts support from Fujikura are no longer available.

• Legacy: It was a premium splicer in its time, offering excellent splice quality and reliability for professional carriers and contractors. Its design language and internal technology directly paved the way for the hugely successful FSM-60S model.

• Key Feature: It utilized an advanced Hybrid Alignment System, combining passive and active core alignment techniques for high accuracy and speed.

2. Performance & Technical Specifications

For its era, the 43S offered top-tier performance, particularly in splice loss consistency.

• Alignment Method: Core Alignment. It used Fujikura's sophisticated imaging system to view and align the fiber cores directly on the X, Y, and Z axes before fusion.

• Average Splice Loss: Extremely low for its time. Typically < 0.03 dB for standard single-mode fiber (SMF, G.652) under ideal conditions. This made it suitable for long-haul and CATV networks with strict loss budgets.

• Splice Cycle Time: Approximately 9 seconds (a significant improvement over the ~15 seconds of the 33S).

• Heater Time: The integrated sleeve heater (for 60mm sleeves) took around 30-35 seconds, which was also a major improvement over previous models.

• Display: A larger, high-resolution monochrome LCD screen compared to the 33S. The menu system was more advanced but still non-touch.

• Power Source: Utilized a newer, more efficient lithium-ion battery pack (e.g., FSB-22/23 series), offering around 200-250 splices on a single charge. Compatible with AC and DC power sources.

• Robustness: Maintained Fujikura's reputation for building incredibly durable and field-worthy equipment.

3. Model Variants & Listing

The 43S platform had several variants, often differentiated by their included accessories and target market.

Model Name

Key Description & Purpose

FSU 43S

The standard, full-featured base model. Included the splicer, a basic battery, AC adapter, and essential tools.

FSU 43S "M" Package

A more comprehensive kit ("M" often stood for Maintenance or Manual). Typically included a robust hard carrying case, multiple batteries, a larger toolset, and sometimes a portable printer.

FSU 43S "FAST" Mount

Similar to the 33S FM, this variant included a specialized baseplate for rapid mounting onto specific aerial lift platforms or closure systems used by large telecom operators.

FSU 43SL

A "Lite" version. This was typically the same core splicer unit but sold in a simpler package with fewer accessories (e.g., a soft case instead of a hard case, one battery) to reduce the entry cost.

Critical Note on Parts: Finding genuine new replacement parts (like the specific FSU-XXXelectrodes, V-grooves, or heaters) is very difficult. They are largely only available as "pulled from working unit" parts on the used market.

4. Comparison with its Predecessor and Modern Successors

Feature

Fujikura 33S (Older)

Fujikura 43S (Newer)

Modern Splicer (e.g., Fujikura 70S/100+)

Splice Time

~15-20 sec

~9 sec

~7-8 sec (Fast Mode)

Heater Time

~60-90 sec

~30-35 sec

~25-28 sec

Display

Basic Monochrome LCD

Improved Monochrome LCD

Full-Color Touchscreen

Battery Life

~100-150 splices

~200-250 splices

~400-500+ splices

Software

Basic Menu

More Advanced Menu

Android OS, Apps, Cloud

Conclusion:

The Fujikura 43S was a superior, high-precision fusion splicer that represented the pinnacle of technology in its mid-2000s heyday. It is remembered for its excellent splice quality, improved speed, and rugged design.

However, like the 33S, it is obsolete. Its value today lies solely on the used market. For any professional fiber optic deployment, modern splicers like the Fujikura FS-100 (refined core alignment) or FS-200 (ultra-fast and intelligent) offer overwhelming advantages in speed, battery life, user interface, data management, and support, making the 43S a capable but outdated piece of equipment.