4-Core Underwater Fibre Optic Connector CCP — 4 Channel, 8,000m Depth, Expanded Beam

4-Core Underwater Fibre Optic Connector — CCP (Cable Mount) — Overview

This 4-core cable-mount (CCP) underwater fibre optic connector transmits up to four independent optical fibre circuits through a single connector, rated to 8,000 metres standard depth — covering the full working depth of commercial deep-rated ROV systems and the majority of scientific research deployments. Using expanded beam ball lens technology on all four channels simultaneously, it provides low-loss, reliable optical connectivity for high-bandwidth data, multi-channel video, or combined data and telemetry systems.

The CCP cable-to-cable push-pull configuration enables direct in-line fibre connections without panel mounting. Single-mode, multi-mode, or mixed fibre types can be accommodated within the same 4-channel connector body.

Key Design Features

• 4 independent fibre channels — transmit up to 4 simultaneous optical circuits: data, video, control, and telemetry in a single connector
• 8,000 metre standard depth rating — rated beyond the operating depth of virtually all commercial deep-water ROV systems
• Expanded beam ball lens on all 4 channels — contamination-tolerant, field-cleanable, unlimited mating cycles across all fibre passes simultaneously
• CCP cable-mount push-pull configuration — direct cable-to-cable connection, no panel mount required; rapid connect/disconnect on deck or underwater
• Single-mode, multi-mode, or mixed fibre types — accommodate different channel requirements (e.g. SM for long-distance data, MM for short-distance video) within one connector
• Nickel Aluminium Bronze C63000 / Stainless Steel / Titanium housing options — optimise for strength, corrosion resistance, or weight
• Field re-terminable — re-terminate individual channels on deck without returning to a workshop
• Reduces connector count — 4 circuits through 1 connector vs 4 separate single-fibre connectors, minimising housing penetrations

Technical Specifications

Typical Applications

• Deep-water ROV umbilical 4-channel fibre optic data and video multiplexer connections
• AUV tether 4-channel high-bandwidth optical data link connections
• Subsea fibre optic cable repair and extension joints — 4-channel capability
• Cabled observatory inter-node 4-channel fibre optic backbone connections
• Deep scientific research vehicle optical telemetry and sensor data connections
• Offshore renewable energy (tidal, wind) subsea control system fibre links
• Subsea completion system multi-channel fibre control and monitoring connections

Why Expanded Beam — The Advantage Over Physical Contact Fibre Connectors

1. Tolerates Contamination — No Precision Polishing Required Subsea

Expanded beam technology enlarges the light beam to approximately 1.5 mm in diameter before it crosses the air gap between the two lenses. At this diameter, a dust particle or water droplet on the lens face occupies only a tiny fraction of the beam cross-section, causing negligible signal loss. Physical contact connectors focus light through a 9 µm core (single-mode) — a single dust particle can completely obstruct the beam and cause catastrophic signal loss. In subsea environments where cleaning is difficult or impossible, expanded beam is the only reliable choice.

2. Unlimited Mating Cycles — No Wear Mechanism

Physical contact connectors degrade with every mating cycle as the polished ferrule faces abrade against each other. Expanded beam connectors mate lens-to-lens across an air gap — there is no physical contact between the optical surfaces, no abrasion, and no degradation of optical performance over time. Unlimited mating cycles are qualified without any change in insertion loss.

3. Field Re-terminable — No Specialist Polishing Equipment Required

The spherical ball lens design allows the connector to be re-terminated in the field using a simple termination kit. The lens can be cleaned with a cotton swab in seconds. Physical contact connectors require precision polishing machines and inspection microscopes to achieve an acceptable end-face geometry — impractical on a vessel deck or at a shoreside deployment site.

4. Multiple Housing Materials for Any Environment

Available in Nickel Aluminium Bronze C63000, Stainless Steel AISI 316, and Titanium Grade 2 — allowing system designers to optimise for corrosion resistance, weight, or cost depending on mission profile and deployment duration.

5. Mixed Single-Mode and Multi-Mode in One Connector

Both single-mode and multi-mode fibres can be accommodated within the same connector body, enabling a single connector to serve mixed data (single-mode, long-distance) and video (multi-mode, short-distance) circuits simultaneously — reducing connector count and penetration points on the pressure housing.

Installation, Cleaning, and Maintenance Guidelines

Lens Cleaning Procedure

• Inspect the ball lens face under a 400× inspection microscope before every mating cycle — even minor contamination visible at this magnification should be removed before connecting.
• Clean the lens face with a lint-free cotton swab dampened with isopropyl alcohol (IPA, 99%+ purity). Allow to dry completely before mating — residual IPA causes temporary elevated insertion loss.
• Do not use dry swabs — they generate static charge that attracts particles back to the lens surface.
• Never touch the lens surface with bare fingers — skin oils cause persistent contamination that requires repeated cleaning cycles.

Mating Procedure

• Verify lens faces are clean and free of contamination on both connectors before mating.
• Align the connector keying features before applying axial force — do not rotate the connector during insertion if it is a push-pull (CCP) type.
• For threaded types (BCR/FCR), engage threads carefully and tighten to the specified torque — do not overtighten as this can distort the housing and affect optical alignment.
• Verify optical continuity with an optical power meter after mating — acceptable insertion loss should be within the connector's specified range.

Storage and Protection

• Always install protective dust caps on unmated connector faces during storage, transit, and any period when the connector is not in use.
• Store connectors in a clean, dry environment — the ball lens is robust, but contamination accumulation over extended storage will require cleaning before use.
• For long-term seabed deployment with one connector face unmated, use a pressure-rated protective cap rated to the full deployment depth.