Coreray: Leading Fiber Optic Switch Manufacturer - MEMS & Mechanical Optical Solutions

Introduction

    In modern photonics laboratories and industrial inspection systems, the ability to route visible light (380–780 nm) to multiple channels is fundamental. Whether you are building a fluorescence lifetime imaging microscope, a multi-point spectrometer, or a visible light communication testbed, you need a reliable and flexible way to distribute light from one source to many detectors—or vice versa.

    Traditional solutions like manually repositioning optics or using bulk beam splitters are cumbersome, error-prone, and lack automation. This is where fiber optic switches step in. Among them, mechanical optical switches offer low insertion loss, high isolation, and wavelength-independent operation—ideal for broadband visible light.

    But a new breed of switch takes convenience a step further: the array-based output switch. Instead of terminating each output channel in a fiber connector, it delivers light via a precisely aligned collimator array. In this article, we delve into the technology behind Coreray’s 1×16 visible light multimode switch with 4×5mm collimator array output, and explore how it revolutionizes multi-channel visible light system design.

Technical Principle: From Fiber to Free-Space Array

Motor-Driven Optical Switching

    At the heart of the Coreray 1×16 visible light switch is a stepper motor (type 20) that actuates a precision mechanism—typically a moving mirror or a fiber-collimator assembly. When a control signal (RS232 or TTL) commands a channel change, the motor rotates to a specific position, aligning the input beam with the desired output port. Mechanical switches of this kind are renowned for their:

·         Low insertion loss (<1.5 dB) because the beam travels through air without passing through electro-optic crystals.

·         High return loss (>35 dB) and low crosstalk (>35 dB), ensuring signal purity.

·         Broad wavelength coverage—no wavelength-dependent coatings limit the range, making them perfect for 380–780 nm.

Why a Collimator Array?

    Conventional 1×N switches output each channel through a separate fiber connector (FC, SMA, etc.). The user must then connect each fiber to a detector or further optics. This creates cable clutter and requires additional collimation optics if free-space coupling is needed.

The 4×4 collimator array in Coreray’s switch changes the game:

·         Integrated Collimation: Each output channel incorporates a miniature lens that collimates the light emerging from the fiber. The result is a set of parallel beams with a defined diameter (2 mm at a working distance of 7.5 mm).

·         Precise Geometry: Channels are arranged on a 5 mm pitch grid, matching the layout of many commercial multi-anode PMTs, CCD arrays, or micro-lens arrays.

·         Direct Free-Space Coupling: You can place a detector array, a microscope slide, or a diffractive optical element directly in front of the output window—no extra fibers or lenses needed.

Built-in Beam Conditioning

Inside the switch, a 3 mm lens ensures the light from the input fiber is well collimated before entering the switching mechanism. This maintains beam quality across all channels and contributes to the low loss and consistent spot size.

Key Advantages for Visible Light Applications

1. Simplified System Integration

    Imagine setting up a multi-channel fluorescence detector. Instead of running 16 separate fibers from a switch to 16 detectors, you align the detector array once to the 4×5mm output grid. Alignment is stable and repeatable, drastically reducing setup time and eliminating fiber management headaches.

2. Preservation of Beam Quality

    Because each output is pre-collimated, the beam divergence is controlled. This is crucial for applications like hyperspectral imaging, where you need to illuminate different areas with uniform light, or for flow cytometry, where precise spot geometry affects measurement accuracy.

3. Automation and Repeatability

    RS232/TTL control allows seamless integration with LabVIEW, Python, or PLC environments. You can program complex measurement sequences—e.g., sequentially exposing different samples to a single light source—without manual intervention. The motor drive ensures that the selected channel is repeatable to within microns, essential for quantitative analysis.

4. High Power Handling

    Multimode fiber (200/220µm core) and free-space propagation mean the switch can handle moderate to high optical powers (watts level) without damage. This is a distinct advantage over MEMS switches, which often have lower power thresholds due to their tiny structures.

5. Ruggedness for Field Use

    Armored pigtails and an aluminum housing protect against vibration, dust, and accidental tugs. The operating temperature range (-20°C to +70°C) makes it suitable for industrial environments, such as inline quality control in manufacturing.

Application Deep Dive

Spectroscopy: Multi-Channel Spectral Acquisition

    In Raman or fluorescence spectroscopy, it is common to measure multiple samples sequentially. A single spectrometer coupled with a 1×16 switch can monitor 16 different reaction vessels or positions. The array output can directly interface with a fiber bundle leading to the spectrometer slit, or with a spatial light modulator for Hadamard transform spectroscopy. The low loss ensures maximum signal, critical for weak fluorescence signals.

Fluorescence Lifetime Imaging (FLIM)

    FLIM systems often use pulsed lasers and time-correlated single photon counting (TCSPC) detectors. Switching between multiple excitation spots or collection channels requires precise timing and minimal signal distortion. The mechanical switch’s high isolation prevents crosstalk between channels, preserving lifetime measurements. Moreover, the collimated output can be directly coupled into a microscope’s scan head or a multi-channel PMT array.

Visible Light Communication (VLC) Research

    VLC researchers need to test modulation schemes over different free-space links. The 1×16 switch allows rapid selection of different optical paths (e.g., various distances, through different media) while keeping the transmitter and receiver fixed. The array output can illuminate an array of photodiodes or spatial light modulators, enabling parallel channel characterization.

Industrial Machine Vision

    In automated inspection, multiple viewpoints are often required. A single high-intensity light source can be switched between different illumination paths—each output beam aimed at a different part of the product. The array output can be fitted with projection optics to create structured light patterns. The robust design ensures long-term reliability on the factory floor.

Comparison: Mechanical vs. MEMS Optical Switches for Visible Light

For visible light applications where broadband operation and high power are paramount, mechanical switches remain the workhorse. The array output feature further tilts the balance in favor of mechanical designs for free-space systems.

Coreray’s Commitment to Quality and Customization

At 广西科毅光通信科技有限公司 (Coreray), we understand that no two projects are identical. That’s why our visible light optical switches are highly customizable:

·         Fiber type: 200/220µm (standard) or 400/440µm for higher power collection.

·         Array pitch: Standard 5mm; other pitches available on request.

·         Armored cable length: Adjust input/output lengths to fit your rack.

·         Connectors: SMA905 input (standard); output array can be replaced with fiber connectors if preferred.

·         RoHS compliance: Available upon request for environmentally sensitive projects.

All switches undergo rigorous testing: insertion loss, return loss, crosstalk, and temperature cycling (-40°C to +85°C for 48 hours). We provide full documentation, including measured data for each channel.

Conclusion

    The Coreray 1×16 visible light optical switch with 4×4 collimator array output is a game-changer for researchers and engineers building multi-channel visible light systems. By combining robust mechanical switching with a free-space array output, it eliminates fiber clutter, simplifies alignment, and maintains excellent optical performance across 380–780 nm.

    Whether you are developing the next generation of fluorescence microscopes, automating a spectrometer array, or prototyping visible light communication networks, this switch offers the flexibility and reliability you need.

    Choosing the right optical switch manufacturer like Coreray ensures you get a tailored solution backed by years of photonics expertise. Contact our team today to discuss your specific requirements and discover how our visible light switches can accelerate your project.

For more information on our complete line of fiber optic switches, including MEMS, mechanical, and specialty switches, visit www.coreray.com or email coreray@coreray.cn.