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Description

780nm Single Mode Patch-Cord – Precision Fiber Interconnect for 700–800 nm Systems

The 780nm Single Mode Patch-Cord from DK Photonics is a high‑performance optical interconnect designed specifically for applications operating around the 780 nm wavelength region. This patch cord provides a stable, low‑loss link between fiber‑optic components and instruments, ensuring consistent performance in demanding laboratory, industrial, and OEM environments. Built around precision single mode fiber (commonly 780‑HP or equivalent), it offers tight mode control, excellent return loss, and repeatable connections for high‑fidelity optical signal transmission.

Engineered as part of DK Photonics’ SM Patch-cord Series, this 780 nm patch cord is available with popular connector options such as FC, SC, LC and others, in both PC and APC polishing styles to suit different system requirements. The FC connector option is particularly well suited for laboratory and test setups at 780 nm due to its threaded, vibration‑resistant design and high alignment repeatability. With narrow key FC interfaces (2.0 mm) and controlled connector geometry, the assembly delivers high return loss and minimal back reflections, which is critical for stable laser operation and sensitive detection schemes.

The cable structure typically uses a 0.9 mm loose tube, with other outer diameters available on request, providing a good balance between mechanical robustness and routing flexibility. The single mode fiber used in this series is optimized for near‑infrared operation around 780 nm, featuring a well‑defined mode field diameter and low attenuation to preserve beam quality over the length of the patch cord. Typical mode field diameter values are specified at the 1/e² power level in the near field, ensuring consistent coupling conditions when interfacing with lasers, fiber components, or free‑space optics.

At 780 nm, efficient and stable coupling is essential for applications such as diode‑pumped solid‑state laser systems, cold‑atom and quantum optics experiments, atomic clocks, spectroscopy setups, and precision metrology. The DK Photonics 780nm Single Mode Patch-Cord is designed to meet these needs, offering low insertion loss, high return loss, and excellent long‑term reliability. Its robust connectorization and careful polishing process help minimize insertion loss variations, while high‑quality ferrules and alignment sleeves ensure consistent performance across repeated matings.

This patch cord is also an excellent choice for fiber‑based instrumentation operating near 780 nm, including optical spectrum analyzers, fiber‑coupled laser sources, interferometers, and coherent detection systems. When used as a fiber I/O port, it provides a clean, well‑defined single mode output that simplifies alignment into free‑space optics or other fibers. In fiber transmitters, transceivers, and communication testbeds that use 700–800 nm wavelengths, the patch cord helps maintain signal integrity by minimizing reflections and polarization‑related fluctuations inherent to poorly matched connectors or substandard cabling.

DK Photonics supports a wide range of custom configurations in this series, allowing you to specify connector type, polish style (PC or APC), fiber type (including 780‑HP panda or other specialty PM/single mode fibers when required), fiber jacket diameter, and patch cord length. The standard length tolerance is typically ±5 cm, which is suitable for most laboratory and OEM integrations, but tighter or special length requirements can be accommodated on request. This flexibility makes the 780nm Single Mode Patch-Cord well suited for custom fiber laser systems, integrated optical benches, and complex fiber‑routing architectures where exact lengths and connector combinations are critical.

For OEM and system integrators, the 780nm Single Mode Patch-Cord offers a reliable building block that balances optical performance, mechanical robustness, and manufacturing consistency. Its design aligns with industry practice for single mode patch cords at visible–NIR wavelengths, comparable to those used in leading quantum optics, bio‑photonics, and spectroscopy platforms. By combining high return loss and low insertion loss with precise connector options and configurable geometries, this patch cord provides a dependable interconnect solution for any 780 nm single mode fiber application.

780nm Single mode Patch-Cord

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Specifications

Wavelength Range: 781 – 970 nm
Cable Length: 1 m
Fiber Core Material: Silica
Product Type: 780 nm single mode patch-cord
Series: SM Patch-cord Series
Center Wavelength: 780 nm
Fiber Type: 780-HP panda fiber
Fiber Length (example): 2 m
Cable Outer Diameter: 0.9 mm OD loose tube
Connector Type (example): FC/APC at all ports
Connector Polish Options: PC, APC
FC Connector Key Width: 2.0 mm (narrow key)
Return Loss: High
Insertion Loss: Low
Length Accuracy (default): ±5 cm

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

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Features

  • Optimized for 780 nm Single-Mode Operation – Precisely engineered for 780 nm wavelength applications, ensuring low loss and stable single-mode transmission in demanding photonics setups.
  • Low Insertion Loss – High-quality 780 nm single-mode fiber and precision polishing minimize insertion loss, improving overall system power budget and signal quality in laboratory and OEM systems.
  • High Return Loss / Low Back-Reflection – Available with PC or APC polished connectors to achieve high return loss, reducing back‑reflection into lasers, optical transmitters, and sensitive detection circuitry.
  • Excellent Stability and Reliability – Robust construction, strict process control, and high‑grade materials provide long‑term optical and mechanical stability for continuous or cyclical operation.
  • Multiple Connector Options – Offered with industry‑standard connectors such as FC, SC, LC and others upon request, enabling straightforward integration into existing fiber optic networks and instrumentation.
  • FC Narrow-Key Compatibility – FC connectors use a narrow key (2.0 mm), ensuring precise keying, repeatable mating, and compatibility with common 780 nm test and measurement equipment.
  • High-Precision End-Face Polishing – APC and PC end‑faces are polished and inspected to telecom‑grade standards, delivering consistent performance across large deployments.
  • Custom Fiber Types Available – Supports standard 780 nm single-mode fibers as well as specialty options such as 780‑HP panda polarization‑maintaining fiber (for related pigtail/PM configurations), tailored to advanced photonics experiments.
  • Flexible Cable Construction – Available with 0.9 mm OD loose tube and other jacket diameters on request, balancing flexibility, compact routing, and mechanical protection.
  • Custom Lengths with Tight Tolerance – Standard lengths with default length accuracy of ±5 cm; special length tolerances can be provided for interferometric, timing, or delay‑line applications.
  • Single or Dual Connector Configurations – Offered as patch cords (two connectors) or pigtails (one connector), simplifying integration as a device pigtail or as a link between instruments.
  • Low Polarization-Dependent Effects – Carefully controlled fiber geometry and connector processing help minimize polarization-dependent loss, beneficial for precision measurement and sensing setups.
  • High Mechanical Durability – Quality strain‑relief boots and robust jacketing resist bending, twisting, and handling in laboratory benches, production lines, and field environments.
  • Tight Quality Control and 100% Testing – Each patch cord is tested for insertion loss and return loss at 780 nm, ensuring consistent, specification‑compliant performance across batches.
  • Laser-Ready Performance – Designed for use with 780 nm diode and fiber lasers, minimizing feedback and power loss to protect sources and maximize delivered optical power.
  • Broad Application Compatibility – Ideal for fiber lasers, fiber instruments, fiber I/O ports, optical transmitters and transceivers, spectrometers, atomic physics experiments, and general 780 nm photonics research.
  • Easy Integration into Fiber Networks – SM patch cord design allows rapid plug‑and‑play connection between active devices, passive components, and test equipment in fiber‑optic benches and systems.
  • Custom Configurations on Request – DK Photonics can rapidly deliver custom wavelengths, connector types, fiber types, jacket diameters, and lengths according to user‑defined P/N, supporting OEM and research projects.
  • Compact and Lightweight – Slim form factor enables high‑density routing on optical tables, within racks, or inside instruments, comparable to leading 780 nm patch cords on the market.
  • RoHS-Compliant Materials – Manufactured using environmentally friendly, RoHS‑compliant components, aligned with global standards for optical communication products.

Applications

  • Fiber laser systems at 780 nm – Flexible interconnection of seed lasers, pump lasers, and amplifier stages in laboratory and industrial fiber laser setups.
  • Precision fiber optic test & measurement – Linking 780 nm optical sources, power meters, spectrum analyzers, and optical test benches for R&D and production testing.
  • Fiber I/O ports in photonic modules – Input/output jumpers for 780 nm fiber-coupled devices, sub-modules, and integrated photonic assemblies.
  • Optical transmitters & transceivers – Patching 780 nm transmitter/receiver modules to distribution frames, evaluation boards, and system racks.
  • Quantum optics and quantum communication experiments – Stable single‑mode delivery of 780 nm light for cold‑atom setups, quantum key distribution testbeds, and single‑photon experiments.
  • Atomic and laser cooling applications (Rb D2 line at 780 nm) – Delivering and routing 780 nm beams for magneto‑optical traps (MOTs), optical pumping, and spectroscopy of rubidium and related atomic species.
  • High‑precision spectroscopy and metrology – Single‑mode beam delivery for frequency‑stabilized lasers, wavelength references, interferometers, and optical frequency comb subsystems near 780 nm.
  • Biomedical and life‑science optics at 780 nm – Fiber delivery for fluorescence excitation, optical coherence tomography (OCT), and imaging systems operating around the 780 nm window.
  • Integrated photonics and waveguide characterization – Coupling light into and out of 780 nm photonic chips, planar waveguides, and micro‑resonator devices.
  • Fiber‑based sensing systems – Connection of 780 nm interrogation units to fiber sensors, interferometric probes, and specialty single‑mode fibers.
  • Prototype and laboratory fiber networks – Patch connections between 780 nm single‑mode components, optical benches, and breadboard experiments.
  • OEM instrument interconnects – Internal and external patch cords for commercial instruments operating at or near 780 nm, including benchtop and rack‑mount photonics equipment.
  • Connectorized single‑mode pigtails for modules – Use as pre‑terminated leads for lasers, modulators, photodetectors, and other 780 nm fiber‑coupled modules.
  • Low‑loss laboratory patching – General‑purpose 780 nm single‑mode jumpers where high return loss, low insertion loss, and long‑term stability are required.

Frequently Asked Questions

What is a 780 nm single mode patch cord and where is it typically used?
A 780 nm single mode patch cord is a fiber optic jumper cable optimized for operation around the 780 nm wavelength. It uses 780 nm single mode fiber (often 780-HP or equivalent) and is terminated with connectors such as FC, SC, or LC. These patch cords are commonly used in fiber lasers, optical test and measurement instruments, fiber I/O ports, optical transmitters and transceivers, and research labs working with near‑infrared diode lasers around 750–800 nm. DK Photonics offers this as part of its SM Patch‑cord Series with high return loss, low insertion loss, and excellent stability and reliability for precision optical setups.
What are the key optical specifications of DK Photonics 780 nm single mode patch cords?
While exact numerical values can vary slightly with connector and fiber type, DK Photonics 780 nm single mode patch cords are designed for low insertion loss and high return loss at 780 nm. Typical industry values for premium 780 nm single mode patch cords are: insertion loss ~≤0.3–0.5 dB per connector and return loss ≥50 dB for PC and ≥60 dB for APC terminations. Mode Field Diameter (MFD) is specified as a nominal value at the 1/e² intensity level in the near field, matching the 780-HP style single mode fiber commonly used in fiber lasers and precision instruments. DK Photonics reserves the right to adjust specifications, so customers should request the latest datasheet when tight loss budgets are critical.
What connector types and polish options are available for the 780 nm single mode patch cords?
DK Photonics offers 780 nm single mode patch cords with common connector types such as FC, SC, and LC, and can supply other standard connectors on request. Connectors are available with PC (Physical Contact) or APC (Angled Physical Contact) endface polishes. PC connectors provide low insertion loss and good return loss for many lab and general-purpose systems. APC connectors (typically 8° angled) are recommended when you need very high return loss (low back‑reflection), for example in fiber laser cavities or sensitive analog links. FC connectors use a narrow key width of 2.0 mm by default, which is compatible with most high‑precision instruments; wide‑key options can be discussed during ordering if needed.
How do I specify and order a custom 780 nm single mode patch cord from DK Photonics?
DK Photonics uses a structured part number format: SMPC-①-②-③-④-⑤-⑥ for patch cords (and SMPig-… for pigtails with only one connector). An example is SMPC-78-P-S78-90-20-FA, which describes a 780 nm single mode patch cord, P‑grade, 780‑HP panda fiber, 0.9 mm loose tube, 2 m length, with FC/APC connectors on all ports. When inquiring, provide: (1) operating wavelength (e.g., 780 nm), (2) fiber type (e.g., 780-HP or PM panda if needed), (3) cable jacket OD and type (0.9 mm, 2.0 mm, 3.0 mm, etc.), (4) total fiber length, (5) connector type (FC, SC, LC, etc.) and polish (PC or APC) at each end, and (6) any special tolerances such as length accuracy, key orientation, or labeling. Supplying this information allows DK Photonics to quickly quote and manufacture custom patch cords with short lead times.
What is the default cable length tolerance and can DK Photonics provide tighter length accuracy?
For standard 780 nm single mode patch cords, DK Photonics specifies a default length accuracy of ±5 cm. This is suitable for most lab and system interconnect applications. If your application requires precise optical path matching or exact cable routing, you can request tighter length tolerances at the time of order. DK Photonics can accommodate custom length specifications and will confirm achievable tolerances, lead time, and any cost impact when reviewing your detailed requirements.
What is the difference between PC and APC 780 nm patch cords and when should I choose APC?
PC (Physical Contact) patch cords have flat or slightly curved connector endfaces that mate directly, providing low insertion loss and moderate return loss that is sufficient for many general‑purpose and digital applications. APC (Angled Physical Contact) patch cords have an angled endface (typically 8°) that directs back‑reflected light into the cladding rather than back toward the source, significantly improving return loss (lower back‑reflection). For 780 nm systems, APC connectors are strongly recommended for fiber laser cavities, high‑power diode laser delivery, interferometric setups, and analog or intensity‑noise‑sensitive links, where reflections can destabilize lasers or degrade measurement accuracy. PC is usually adequate for routine test connections, lab interconnects, and non‑critical data links.
Can DK Photonics provide 780 nm PM (polarization‑maintaining) patch cords or just standard single mode?
DK Photonics primarily describes the product as a 780 nm single mode patch cord, but the example part number SMPC-78-P-S78-90-20-FA includes "780-HP panda fiber," which is a common polarization‑maintaining (PM) panda‑style fiber at 780 nm. This indicates DK Photonics can supply both standard single mode and PM 780 nm patch cords. When polarization stability is important—such as in PM fiber lasers, interferometers, quantum optics experiments, or sensors—you should explicitly request PM panda fiber, specify the required extinction ratio, and define connector key alignment (fast axis to key). DK Photonics welcomes detailed custom requirements and can configure PM or non‑PM 780 nm patch cords accordingly.

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

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