375nm Single Mode Fiber Optical Patch Cord

Name: 375nm Single Mode Fiber Optical Patch Cord
Brand: DK Photonics

Description

375nm Single Mode Patch Cord – Precision UV Fiber Connectivity for Demanding Optical Systems

The 375nm Single Mode Patch-cord from DK Photonics is engineered for high-precision transmission in the near‑UV region, where conventional telecom fibers cannot maintain stable single-mode performance. Designed specifically around 375 nm operation, this patch cord delivers low insertion loss, high return loss, and excellent long‑term stability, making it an ideal choice for advanced laser systems, metrology setups, and UV‑sensitive instrumentation. By combining UV-optimized single mode fiber with high‑quality FC, LC, SC or other industry‑standard connectors, it provides reliable, repeatable connectivity in laboratory, industrial, and OEM environments.

Unlike standard single mode patch cords optimized for 1310 nm or 1550 nm, this 375 nm patch cord uses specialty single mode fiber with a tailored mode field diameter and numerical aperture to support robust single‑mode guidance at short wavelengths. This design minimizes modal dispersion and beam distortion, which is essential for applications such as frequency‑doubled or frequency‑tripled solid‑state lasers, UV fluorescence excitation, precision lithography, and high‑resolution spectroscopy. The result is a stable, well‑defined output mode that preserves the spatial quality of UV and violet laser sources over the full length of the cable.

The mechanical design of the 375nm Single Mode Patch-cord focuses on durability and stable performance under real‑world handling. The fiber can be supplied with 0.9 mm loose tube protection or other outer diameters on request, improving robustness while maintaining excellent flexibility for routing on optical tables or inside instruments. Tight control of connector geometry and polishing processes—available in PC and APC end‑face options—ensures consistently high return loss and minimal back‑reflection, which is particularly important for feedback‑sensitive laser systems and low‑noise detection setups.

To support a wide variety of optical layouts, this patch cord is offered with multiple connector configurations and customer‑specified lengths. Users can choose FC/PC, FC/APC, SC, LC or mixed connector types to match existing ports on fiber lasers, optical transmitters, receivers, and measurement devices. The default length tolerance is tightly controlled, enabling predictable fiber routing and accurate path‑length management in interferometric or timing‑critical systems. Every assembly is manufactured and tested to ensure consistent optical performance, mechanical integrity, and environmental stability suitable for both R&D and production use.

The 375nm Single Mode Patch-cord fits seamlessly into applications such as UV and visible fiber lasers, fiber‑coupled diode modules, precision fiber I/O ports for optoelectronic instruments, and high‑performance optical transmitters and transceivers operating at shorter wavelengths. Its combination of low loss, high return loss, and proven reliability allows system designers to fully exploit the benefits of single‑mode guidance at 375 nm, whether for accurate beam delivery, stable power monitoring, or integration into complex multi‑channel fiber assemblies. For projects requiring non‑standard fiber types, jacket materials, connector configurations, or special tolerances, the product line is structured to support straightforward customization while maintaining short delivery times and repeatable quality.

Specifications

Wavelength Range:	320 – 430 nm
Cable Length:	1 m
Fiber Core Material:	Silica
Mode Field Diameter (MFD):	2.0~2.4 um @ 350 nm
Test Wavelength:	375 nm
Cutoff Wavelength:	≤310 nm
Insertion Loss:	≤3.0 dB
Return Loss:	≥40 dB
Fiber Type:	SM300
Numerical Aperture:	0.12
Repeatability:	≤0.2 dB
Changeability:	≤0.3 dB
Optical Power:	≤100 mW
Durability:	≥1000 times
Operation Temperature:	-5 to +75 ℃
Storage Temperature:	-40 to +85 ℃

Got questions about specs? Use the inquiry form to ask.

Download Data Sheet

Features

Optimized for 375 nm Single-Mode Operation
Engineered specifically for 375 nm applications with true single-mode performance, ensuring precise beam quality and stable mode profile at UV wavelengths.
Low Insertion Loss
Carefully polished and aligned connectors, high‑grade UV single‑mode fiber, and tight process control deliver consistently low insertion loss for maximum power throughput and minimal signal attenuation.
High Return Loss / Low Back Reflection
Available in PC and APC polishing options to achieve high return loss, reducing back‑reflection into sensitive laser sources and improving system stability and lifetime.
Excellent Stability and Reliability
Designed for demanding lab and industrial environments, with robust materials, UV‑compatible fiber coating, and controlled manufacturing to provide long‑term optical and mechanical stability.
High-Quality UV Single-Mode Fiber
Uses specialized 300 µm‑class UV single-mode fiber (e.g., SM300) optimized for 375 nm, offering low attenuation in the near‑UV and a well‑defined mode field diameter for tight focusing.
Custom Connector Options (FC, LC, SC and More)
Supports a wide range of connector types including FC/PC, FC/APC, SC/PC, SC/APC, LC/PC, and others on request, enabling easy integration with existing equipment and test setups.
Flexible Configuration: Patch-Cord or Pigtail
Offered as standard 375 nm single-mode patch cords (connectors on both ends) or as single-mode pigtails (connector on one end, bare fiber on the other) to match different packaging and integration needs.
Precision Ferrule and Keying
FC connectors use the narrow key (2.0 mm) standard for improved rotational alignment, ensuring consistent polarization and coupling performance in precision optical systems.
Custom Lengths with Tight Length Tolerance
Standard and custom cable lengths available, with a default length accuracy of ±5 cm; tighter tolerances can be supplied upon request for time‑critical or length‑sensitive systems.
Small-Form OD Loose Tube Protection
Uses a compact 0.9 mm OD loose tube for flexible routing in dense optical setups, while providing mechanical protection and strain relief for the fragile UV fiber.
High Power Handling for UV Fiber Lasers*
Designed for reliable use with typical 375 nm fiber‑coupled laser sources and transmitters; appropriate connector polishing and cleanliness support stable coupling at UV power levels (*observe standard UV handling and derating guidelines).
Low Polarization-Dependent Loss (PDL)
High‑precision connector geometry and fiber alignment minimize PDL, beneficial for polarization‑sensitive measurements and interferometric setups.
Wide Application Compatibility
Ideal for fiber lasers, fiber instruments, fiber I/O ports, optical transmitters and transceivers, spectroscopy systems, metrology setups, fluorescence excitation, and other near‑UV photonics applications.
Cleanroom-Grade Manufacturing and Testing
Manufactured under controlled conditions with end‑face inspection and performance testing (insertion loss/return loss) to meet stringent lab and OEM quality requirements.
Custom-Engineered Solutions Available
DK Photonics supports custom specifications on connector type, cable length, fiber type, jacket material, polishing style, and assembly details, with responsive engineering support and short lead times.
RoHS-Compliant, Industry-Standard Design
Built to widely adopted telecom and test & measurement standards for single‑mode patch cords, ensuring compatibility with global photonics platforms and compliance with environmental directives.

Applications

UV laser delivery for 375 nm sources in industrial, medical, and scientific systems where stable single-mode beam transmission is required.
Connection of UV DPSS and diode lasers to external optics, scanners, and beam-shaping modules for precise material processing and micro-machining.
UV Raman spectroscopy setups, routing 375 nm excitation light between laser modules, sample stages, and spectrometers with low background and high stability.
Fluorescence excitation in bioimaging and microscopy, delivering 375 nm light to microscopes, flow cytometers, and confocal systems for UV-excitable dyes and proteins.
Fiber-coupled UV spectroscopy and photometry, linking light sources, sample cells, and detectors in analytical instruments operating around 375 nm.
UV curing and photopolymerization systems, providing flexible, stable light delivery for precision curing of adhesives, coatings, and 3D printing resins.
Fiber I/O ports for UV optical modules, serving as input/output interfaces on laser heads, optical benches, and integrated photonic subsystems.
Optical transmitters & transceivers at 375 nm, enabling low-loss coupling between active components and fiber networks in specialty UV communication or sensing links.
Integration and testing of fiber instruments, acting as high-quality patch leads between UV sources, attenuators, switches, filters, and power meters.
Laboratory fiber routing on optical tables, cleanly connecting 375 nm experiments while maintaining single-mode beam quality and polarization options.
High-precision metrology and interferometry at 375 nm, guiding coherent UV light in measurement setups that demand low insertion loss and high return loss.
Fiber-coupled UV sensors and detectors, connecting photodiodes, PMTs, and spectrometers to remote sampling points with stable transmission.
OEM integration into UV laser subsystems, used as internal patch cords within medical, semiconductor, and instrumentation platforms operating at 375 nm.
Prototype and R&D development of UV fiber systems, supporting rapid configuration changes in experimental setups requiring flexible single-mode UV connections.
Environmental and chemical monitoring systems that use 375 nm absorption or fluorescence signatures, linking probes, cells, and detection modules via fiber.

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Frequently Asked Questions

What is a 375 nm single-mode patch cord and where is it typically used?

A 375 nm single-mode patch cord is a fiber optic jumper cable optimized for operation around 375 nanometers (near-UV). It uses a single-mode UV fiber (e.g., SM300 or similar) and precision connectors such as FC, LC, or SC to deliver low insertion loss and high return loss at that wavelength. These 375 nm patch cords are commonly used in UV and violet fiber lasers, fluorescence and spectroscopy systems, fiber-coupled UV light sources, fiber-optic instruments, fiber I/O ports for research setups, optical transmitters and transceivers designed for short-wavelength operation, and laboratory test benches that require stable, low-loss delivery of 375 nm light.

How do I specify and order a custom 375 nm single-mode patch cord from DK Photonics?

DK Photonics uses a structured part number, for example: SMPC-375-P-S30-90-20-FA. This denotes a 375 nm single-mode patch cord with a specific fiber type, grade, jacket size, length, and connector configuration. When ordering, provide the full P/N and a short description, including: operating wavelength (375 nm), fiber type (e.g., SM300 or equivalent), fiber grade (e.g., standard or premium P grade), buffer or jacket diameter (0.25 mm bare, 0.9 mm loose tube, or higher OD if needed), cable length (with length tolerance if tighter than the default ±5 cm), connector type at each end (FC/PC, FC/APC, SC, LC, etc.), and any special requirements (key width, labeling, polishing type, or environmental specs). If a standard configuration does not meet your needs, email sales@dkphotonics.com with your detailed requirements for a custom quote and lead time.

What is the difference between FC/PC and FC/APC connectors on a 375 nm single-mode patch cord?

FC/PC and FC/APC refer to the end-face polish geometry of the FC connector. FC/PC (Physical Contact) uses a flat or slightly curved end-face with fiber cores in direct contact, offering low insertion loss and typical return loss around 40 dB or better. FC/APC (Angled Physical Contact) has an 8° angled polish that significantly reduces back-reflection, achieving very high return loss (often 60 dB or better). For 375 nm single-mode patch cords used with sensitive UV lasers, interferometric setups, or high-precision measurement systems, FC/APC is usually preferred to minimize back-reflection into the source. FC/PC is suitable for general-purpose connections where ultra-low reflection is less critical. DK Photonics supports both FC/PC and FC/APC, using the narrow FC key width (2.0 mm) by default unless otherwise requested.

What are the typical optical performance specifications of a 375 nm single-mode patch cord?

While exact numbers may vary slightly by configuration and ongoing design improvements, 375 nm single-mode patch cords from DK Photonics are designed for low insertion loss and high return loss at 375 nm. A typical configuration with quality connectors and UV single-mode fiber will exhibit insertion loss on the order of ~0.3–0.5 dB per connector pair and return loss typically ≥40 dB for PC and ≥60 dB for APC terminations. The mode field diameter (MFD) at 375 nm is specified as a nominal value at the 1/e² intensity level in the near field and will depend on the chosen UV single-mode fiber (e.g., SM300). For the most up-to-date guaranteed specifications, it is recommended to request the current datasheet or contact DK Photonics directly.

Can 375 nm single-mode patch cords be customized for different lengths, jackets, and connector types?

Yes. DK Photonics supports a broad range of custom options for 375 nm single-mode patch cords. You can choose custom fiber lengths (from short lab jumpers to longer runs), with default length accuracy of ±5 cm and the option to specify a tighter tolerance if needed. Multiple jacket or buffer diameters are available, such as 0.25 mm bare fiber, 0.9 mm loose tube, or larger cabled solutions for added mechanical protection. Connectors can be FC, SC, LC, or other standard interfaces, with PC or APC polish as required. Single-ended pigtails (P/N starting with SMPig-…) with one connector and a bare fiber end are also available. If you need specialized UV fiber, labeling, fan-out, or environmental ruggedization, provide those details in your inquiry for a tailored design.

Are 375 nm single-mode patch cords compatible with standard fiber-optic equipment and connectors?

Mechanically, 375 nm single-mode patch cords use standard connector formats such as FC, SC, and LC, so they are physically compatible with most common fiber-optic couplers, adapters, and bulkheads. However, optically they are optimized for 375 nm; using them with equipment designed only for infrared (e.g., 1310/1550 nm SM fiber) may result in mismatched mode field diameters and higher losses. When integrating these patch cords, ensure that mating components use compatible connector types and polishes (e.g., FC/APC to FC/APC, not APC to PC), and that any couplers or collimators are specified for near-UV operation. If you are unsure about compatibility with your existing system, DK Photonics can help you select matching components or recommend appropriate adapters.

What handling and installation precautions should I follow for 375 nm single-mode patch cords?

375 nm single-mode patch cords use precision UV single-mode fiber and connectors, so careful handling is important. Avoid bending the patch cord below the specified minimum bend radius to prevent excess loss or fiber damage; as a rule of thumb, keep the bend radius larger than 30–40 mm unless the datasheet specifies otherwise. Keep connector end faces clean by using approved fiber optic cleaning tools and inspecting with a microscope when possible, as contamination increases insertion loss and can permanently damage end faces, especially at UV wavelengths. Do not expose the bare fiber or connector end face to high-intensity UV beams outside the specified power range and always ensure connectors are fully mated or capped during operation to avoid stray UV exposure. When routing cables in instruments or racks, use gentle cable management and avoid sharp edges or pinch points to maintain long-term reliability.

Got more questions? Use the inquiry form to ask the supplier directly.