Proprietary Technologies

Fiber End-Caps

Installing fiber End-Caps without impacting the optical quality of the main fiber and measuring the length of the final end-cap is very challenging. Coastal Connections has resolved these issues and builds 1,000s of end-cap assemblies every year for companies around the world.

High Power Mating Connector (PFC)

We believe Coastal Connections is the only company building high power mating cables with standard SMF-28E and SMF-Ultra, the most common single-mode fibers used. The technology is also compatible with other fibers.  Furthermore, Coastal Connections’ connector appears to be compatible with its strongest competitor.

Aligning PM Fibers to Each Other

Some LiDAR and interferometers require multiple PM fibers to be aligned to each other in a single ferrule or capillary. Other assemblies need the PM stress rods to be aligned to a flat or other feature. Coastal Connections has developed the tooling to align PM fibers very accurately and does it regularly.

Multi-Core Fiber Alignment

Coastal Connections developed the technology to align multi-core fibers very accurately in connectors and achieve low insertion losses.

Multi-Channel Vacuum Feedthroughs

Coastal Connections is possibly the only company in the world that can install many PM fibers in a single vacuum feedthrough. A vacuum feedthrough seals on a vacuum chamber allowing fibers to pass into the chamber without passing air at high vacuums.

PZ Fiber Termination

PZ Fibers polarize the light in the fiber as opposed to polarization-maintaining (PM) fibers that simply maintain the polarized light that goes into the fiber. These fibers have a lot of internal stresses that makes terminating them challenging.

Precision Length Cables

Many sensors require the optical path lengths to be controlled. Whether it is 100-meter-long cables where the individual channels need to be matched to within 1cm of each other or 0.3-meter cables where the fibers need to be within 1mm of each other. Coastal Connections also matches cables to +/-20ps of time delay.

Long Cable Feeding

Coastal Connections builds jacketed cables with custom fibers up to 100 meters long and does not know of any other company doing this without jacketing 1,000-meters of fiber which is impractical for very expensive fibers.

Testing PM PER Over Temperature

Testing PM PER Over Temperature
Coastal Connections measure Polarization Extinction Ratio (PER) over time and temperature automatically recording the values the entire time.

Measuring Beam Pointing Angles in Production

For free space optics and verifying ferrule quality knowing the angle of the fiber in the ferrule is very crucial, as the ID of fiber optic ferrules are not parallel to the OD.  Coastal Connections measures ferrules angles to 1/100th of a degree regularly in production.

Fiber Optic Cable Assembly

Coastal Connections designs and builds a large variety of SM, MM, and PM cable assemblies.  We stock over 100 different types of fibers, cables, and connectors/ferrules which allows us to quickly build what you need.  The fibers are installed into plastic and/or steel cabling up to 100 meters long.  Multiple fibers are broken out at the end of the cables and then connectors are installed following very stringent termination procedures that far exceed industry standards.  Cables can be matched in length or we can precisely stagger the length of cables and measure their optical path lengths.

Fiber Types:

SM, PM, MM, LMA, Photonic Crystal Fibers, Mid-IR

Fiber Buffers:

Acrylate, High Temp Acrylate, Silicone, Polyimide
Coastal Connections strips off polyimide coatings

Commercial Connectors:

E-2000, FC, LC, SC, SMA, ST, Duplex LC IP-68

Defense Connectors:

38999, 28876, ARINC 801, Test Probes


1.25mm, 1.6mm, 2.0mm, 2.5mm, and 3.2mm OD in Stainless Steel and Ceramic


1.8mm OD for 1, 2, or 3 fibers, 2.5mm

Cabling Material:

PVC, PVDF, PTFE, ETFE, LSZH, Hytrel, Polyurethane, PBT, PFA, Stainless Steel, Silicone

Fiber Polishing

Coastal Connections polishes 1,000s of bare fiber ends annually for medical and defense applications. Fibers can be polished at any angle from 0 to 50°. We polish PM fibers relative to the stress rods and can polish fibers of any diameter and any coating. We take extra caution to maintain the strength of the fiber during fiber polishing as the polishing process can weaken the fiber.

Fiber Angle:

0 to 50°

Fiber Angle Tolerance:

+/-0.5° Relative to a Reference

Fiber Diameter:

80um to 3.5mm

Fiber Splicing

Coastal Connections has developed many splice routines for a very large variety of fibers. These routines include the ability to adjust the NA of fibers for free space applications. Coastal Connections is one of the few companies that offers PM fiber splicing as a service.

Fiber Diameter:

125 to 400um

Fiber Types:

SM, PM, MM, LMA, Photonic Crystal Fibers

Recoat Diameter:

250 and 400um

Analysis for R&D

Coastal Connections has invested in equipment to analyze the products it builds and to help customers analyze their own products. We buy the best equipment for the job and maintain that equipment to the highest standards.

SM Lasers:

405, 488, 640, 780, 980, 1060, 1310, 1550

MM Sources:

850, 1300nm Lasers, 810, 850, 1300nm LEDs

SM Return Loss:

-10 to -80dB at 1310 and 1550nm

MM Return Loss:

-10 to -58dB at 850 and 1300nm

Polarization Extinction Ratio Wavelengths:

405, 488, 640, 780, 980, 1060, 1310, 1550nm

Polarization Extinction Ratio Methods:

Polarization Analyzer, PER Meter, Cross Polarizers

Fiber Core Eccentricity:

0.2 to 10um

Interferomic Image:

Almost any Fiber or Connector

APC Interferometer Measurement:

E-2000, FC, LC, SC

UPC Interferometer Measurement:

1.25 and 2.5mm Ferrules, FC, LC, SC, ST

Beam Profile:

NA, Ellipticity

Visual Inspection:

Up to 1,000X Magnification

Matched Optical Path Length:


Thermal Cycling:

-65 to 150°C

  (805) 644-5051