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Description

The 525nm single mode patch cord is a precision fiber optic cable designed for stable single-mode transmission at visible green wavelengths. Optimized for photonics, laser delivery, spectroscopy, microscopy, and scientific instrumentation applications, these specialty optical patch cords provide low insertion loss, high return loss, and reliable optical coupling for demanding laboratory and industrial systems. Available with multiple connector configurations including FC, LC, and SC, 525nm single mode patch cords support high-performance optical signal delivery in visible-light fiber optic applications.

What is a Visible-Wavelength Single Mode Fiber?

Visible-wavelength single mode fibers are specialty optical fibers designed to support single-mode light propagation at shorter wavelengths such as 405 nm, 488 nm, and 525 nm. Because shorter wavelengths require much smaller mode-field diameters and tighter optical tolerances, these fibers are optimized differently from conventional telecom single-mode fibers.

Visible single-mode fibers are widely used in:

  • laser delivery,
  • microscopy,
  • spectroscopy,
  • biomedical optics,
  • quantum optics,
  • scientific instrumentation.

Why Use 525nm Optical Fiber Components?

The 525 nm wavelength range is important in many visible-light photonics applications including:

  • green laser systems,
  • fluorescence microscopy,
  • spectroscopy,
  • biomedical imaging,
  • optical instrumentation.

Single mode operation at 525 nm enables precise beam delivery, stable optical coupling, and improved spatial beam quality for demanding scientific and industrial applications.

525nm single mode patch cords are available with multiple connector configurations including:

FC/PC
FC/APC
LC
SC
ST

Connector selection depends on:

  • return loss requirements,
  • precision,
  • laser stability,
  • system compatibility.

APC connectors are commonly preferred for minimizing back reflections in sensitive laser and photonics systems.

Understanding Insertion Loss and Return Loss

Low insertion loss is critical for minimizing optical attenuation in visible-light fiber systems. High return loss helps suppress back reflections that can destabilize laser systems and reduce optical measurement accuracy.

High-performance 525nm patch cords are designed to provide:

  • low insertion loss,
  • stable optical coupling,
  • high return loss,
  • reliable long-term optical performance.

Challenges of Visible-Wavelength Single Mode Fiber Transmission

Single-mode transmission at visible wavelengths requires much smaller mode-field diameters and tighter optical alignment tolerances compared to telecom wavelengths such as 1310 nm or 1550 nm. Precision connector polishing, stable fiber geometry, and careful optical alignment are especially important for minimizing losses and maintaining beam quality in visible-light fiber systems.

525nm Single Mode Patch-Cord

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Specifications

Wavelength Range: 460 – 600 nm
Cable Length: 1 m
Fiber Core Material: Silica
Mode Field Diameter (MFD): 3.4 ± 0.5 um @460 nm
Test Wavelength: 525 nm
Insertion Loss: ≤2.5 dB
Return Loss: ≥40 dB
Fiber Type: 460-HP
Numerical Aperture: 0.12
Repeatability: ≤0.2 dB
Optical Power: ≤100 mW
Operation Temperature: -5 to +75 ℃
Storage Temperature: -40 to +85 ℃
Length Accuracy: +/-5CM

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

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Features

  • Optimized for 525 nm Single-Mode Operation – Precisely engineered for stable single-mode transmission at 525 nm, ideal for visible-green wavelength fiber systems.
  • Low Insertion Loss – High-quality fiber and precision polishing deliver minimal insertion loss, helping to maximize system power budget and signal fidelity.
  • High Return Loss – Excellent back-reflection performance (high return loss) reduces signal distortion and protects sensitive laser sources at 525 nm.
  • Excellent Stability and Reliability – Robust design, strict manufacturing control, and proven components ensure long-term stability in laboratory, industrial, and field environments.
  • High-Precision Connectors (FC/PC, FC/APC, LC, SC, etc.) – Available with a wide range of industry-standard connectors, including PC and APC polish options for optimized back-reflection performance.
  • Single-Mode Fiber Optimized for 460-HP and Similar Types – Compatible with commonly used 460-HP and equivalent single-mode fibers at 525 nm, ensuring good mode-field matching and low coupling loss.
  • Custom Lengths with Tight Length Tolerance – Standard length accuracy of ±5 cm; other tolerances and custom lengths are available on request for precise system layouts.
  • Various Cable Diameters and Jacket Options – Offered in 0.9 mm OD loose tube and other jacket diameters; different buffer and jacket materials available for lab, rack, and OEM integration.
  • Low Polarization-Dependent Loss – Carefully controlled geometry and connector quality help minimize PDL, improving performance in polarization-sensitive systems.
  • High Power Handling (Application-Dependent) – Suitable for typical low-to-medium power 525 nm fiber laser delivery and instrumentation; power-handling upgrades available for specialized use.
  • Excellent Repeatability and Interchangeability – Tight connector tolerances and quality ferrules ensure consistent performance across multiple mating cycles and between different patch cords.
  • Wide Application Compatibility – Designed for 525 nm fiber lasers, fiber instruments, fiber I/O ports, optical transmitters and transceivers, sensing systems, imaging setups, and R&D test benches.
  • Clean and Stable Connector End-Faces – Professionally polished and inspected connector end-faces minimize scattering and contamination-related performance drift.
  • Flexible Configuration Options – Available as patch cord (two connectors) or pigtail (single connector), with customizable connector types at each end for easy integration into mixed-connector networks.
  • Short Lead Times on Custom Designs – DK Photonics supports rapid turnaround for custom wavelengths, lengths, connector combinations, and cable constructions.
  • Compact and Lightweight – Slim cable profile and compact connectors simplify routing in crowded racks, optical tables, and integrated modules.
  • RoHS-Compliant Materials – Environmentally responsible construction using RoHS-compliant materials suitable for global deployment.
  • Proven in OEM and Research Environments – Suitable for integration into OEM equipment as well as for use in research labs requiring consistent, repeatable optical performance at 525 nm.

Applications

  • Precision fiber laser delivery for 525 nm green lasers in materials processing, micro-machining, lithography, and semiconductor wafer inspection
  • High‑stability optical links in green laser metrology systems, interferometers, and optical test benches requiring low insertion loss and high return loss
  • Fiber‑coupled laser diode routing for 515–532 nm DPSS and diode lasers in OEM laser modules and compact laser heads
  • Optical transmitter and transceiver interconnects in short‑reach, high‑reliability data links and optical backplanes operating around 525 nm
  • Single‑mode fiber I/O ports for integrating 525 nm SM fibers into benchtop and rackmount instruments, optical sub‑assemblies, and evaluation boards
  • Fiber‑optic test and measurement for connecting optical power meters, spectrum analyzers, OTDRs, and other fiber instruments at visible wavelengths
  • Laboratory patching and routing of 525 nm signals in R&D labs, university optics teaching labs, and photonics research facilities
  • Single‑mode pigtailed components interface for 520–530 nm isolators, couplers, WDMs, filters, and other passive devices
  • Biomedical and life‑science optics including excitation delivery for fluorescence microscopy, flow cytometry, confocal imaging, and bio‑sensing at 488–532 nm
  • Endoscopy and medical illumination as a stable, low‑loss delivery fiber for green laser light in minimally invasive diagnostic and therapeutic systems
  • Machine vision and inspection systems using 525 nm structured light, line‑scan illumination, and precision alignment sensors
  • Holography and interferometric imaging where coherent, single‑mode 525 nm delivery improves fringe contrast and image quality
  • OEM integration into compact instruments, sensors, and handheld devices that require robust, reliable green single‑mode fiber patch cords
  • Reference links and calibration paths in production test setups, burn‑in stations, and QA lines for 525 nm sources and components
  • Prototype and system evaluation of new 520–530 nm laser sources, detectors, and fiber‑optic subsystems

Frequently Asked Questions

What is a 525 nm single mode patch cord and where is it typically used?
A 525 nm single mode patch cord is a fiber optic jumper cable optimized to transmit a single spatial mode of light around a 525 nm (green) wavelength. DK Photonics 525 nm patch cords are designed for high return loss, low insertion loss, and good long‑term stability, making them suitable for green fiber lasers, precision fiber‑optic instruments, fiber I/O ports on optical benches, and optical transmitters and transceivers that operate in the visible range. Compared with common telecom patch cords (1310/1550 nm), these are built around visible‑wavelength single mode fiber (e.g., 460‑HP) and are used in laboratories, R&D setups, sensing systems, and OEM modules that require stable, low‑loss delivery of 525 nm light.
How do I choose the right connector type (FC, SC, LC, PC, APC) for a DK Photonics 525 nm single mode patch cord?
Connector choice depends on your existing hardware and performance requirements: - FC/PC or FC/APC: Common in lab and laser setups; FC has a threaded coupling for stable, repeatable connections. APC (angled physical contact) is preferred when you need very high return loss (low back reflection), for example with sensitive lasers or interferometers. - SC/PC or SC/APC: Push‑pull connector typically used in equipment panels; APC versions offer better return loss. - LC: Small‑form‑factor connector used when space is limited or for high‑density panels. The datasheet notes that DK Photonics offers FC, LC, SC and both PC and APC polishes. Match the connector type and polish to your instruments’ input and output ports; mixing PC and APC on the same link is not recommended because it increases insertion loss and back reflection. When requesting a quote, specify the connector type (e.g., FC/APC–FC/APC) and key width (FC uses a 2.0 mm narrow key by default).
What are insertion loss and return loss for these 525 nm single mode patch cords, and why do they matter?
Insertion loss (IL) is the optical power lost when you insert the patch cord into your system, typically expressed in dB. Lower IL means more of your 525 nm laser power reaches the target. Return loss (RL) quantifies how much light is reflected back toward the source; higher RL values (e.g., >55 dB for APC, depending on grade) mean lower back reflection. The DK Photonics 525 nm single mode patch cords are specifically characterized by low insertion loss and high return loss, which is important for: - Maintaining accurate power levels at detectors or experimental setups - Protecting lasers from feedback that can cause noise, mode hopping, or damage - Ensuring stable operation in interferometric and measurement systems. Exact IL/RL values can vary by fiber type, connector type, and grade (e.g., standard vs P‑grade). For critical designs, request the current IL/RL specifications from DK Photonics with your desired configuration.
What fiber type and mode field diameter are used in DK Photonics 525 nm single mode patch cords?
The part‑number example in the datasheet (SMPC‑525‑P‑S46‑90‑20‑FA) indicates that DK Photonics commonly uses 460‑HP single mode fiber for its 525 nm patch cords. 460‑HP (and similar visible‑wavelength single mode fibers from major suppliers) is designed for single‑mode operation around 488–532 nm and typically has a mode field diameter on the order of a few micrometers at 525 nm. The datasheet notes that the mode field diameter (MFD) is specified as a nominal value and defined at the 1/e² power level in the near field. If you need an exact MFD or a different fiber type—for example to match a specific laser or to optimize coupling to a device—DK Photonics can customize the fiber selection and will provide the corresponding MFD data upon request.
Can DK Photonics customize 525 nm single mode patch cords (length, fiber, connector, jacket, pigtails)?
Yes. DK Photonics explicitly supports custom 525 nm single mode patch cords and pigtails beyond their standard offerings. You can customize: - Fiber type (e.g., 460‑HP or other visible‑single‑mode fibers) - Connector types and combinations (FC/PC, FC/APC, SC, LC, single‑ended pigtails, etc.) - Grade (e.g., P‑grade for tighter IL/RL performance) - Cable structure and outer diameter (e.g., 0.9 mm OD loose tube, 2.0 or 3.0 mm jackets) - Length and tolerances (default length accuracy is ±5 cm, tighter tolerances available on request). When inquiring, provide the full part‑number string according to the SMPC‑①‑②‑③‑④‑⑤‑⑥ format or a clear written description of wavelength, grade, fiber type, cable OD, length, and connector types, and DK Photonics will quote with short lead times.
How accurate is the stated length of a DK Photonics 525 nm single mode patch cord and can I specify tighter tolerances?
By default, DK Photonics specifies a length accuracy of ±5 cm for their single mode patch cords, including the 525 nm series. This default tolerance is sufficient for most general‑purpose lab and system‑integration applications. If your application requires a tighter length tolerance—for example, matched‑length cables for interferometry, time‑of‑flight measurements, or synchronized detector arrays—you can request a custom length accuracy when ordering. DK Photonics recommends that customers with special length requirements contact them in advance so they can confirm feasibility and any impact on lead time or cost.
How do I interpret the DK Photonics part number for a 525 nm single mode patch cord (e.g., SMPC-525-P-S46-90-20-FA)?
DK Photonics uses a structured part‑number format for its single mode patch cords: SMPC‑①‑②‑③‑④‑⑤‑⑥ (SMPig‑… for single‑ended pigtails). For the example given in the datasheet: - SMPC: Single Mode Patch Cord series - 525: Test/operating wavelength of 525 nm - P: Grade (P‑grade indicates a premium grade with tighter IL/RL spec, compared to standard) - S46: Fiber type (e.g., a 460‑HP or similar 525 nm single mode fiber; exact code is DK Photonics specific) - 90: Cable structure / jacket size (0.9 mm OD loose tube) - 20: Fiber length (2.0 m) - FA: Connectors at each end (FC/APC at all ports) If you are unsure of any code, you can send DK Photonics the part number together with a brief description (wavelength, length, connector type, jacket OD, etc.), and they will confirm the configuration before production.

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

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