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

    In the race toward all‑optical networks, it’s easy to get dazzled by MEMS and solid‑state technologies. But walk into any telecom central office, cable headend, or fiber‑optic test lab, and you’ll still find racks of mechanical optical switches humming reliably 24/7. Why? Because for applications that demand ultra‑low insertion loss, high channel isolation, and decades of maintenance‑free operation—without the need for microsecond switching—a well‑designed fiber optic switch with precision mechanical actuation remains the most cost‑effective and field‑proven solution.

    Guangxi Coray Optical Communication Technology Co., Ltd. (www.coreray.com) has taken this workhorse platform and refined it for the modern era. The OSW‑1×16 Rack‑Mount Optical Switch combines a 1U 19” modular chassis, epoxy‑free optical path, and flexible parallel interfaces (RS232, RJ45) into a package that is equally at home in a fiber‑characterization lab or a remote ring‑network node. In this article, we’ll examine where a 1×16 optical switch China design like the Coray OSW series delivers tangible advantages over MEMS alternatives, and why network engineers continue to specify mechanical switching for long‑haul monitoring and component testing.

Mechanical vs. MEMS – Choosing the Right Tool for the Job

Before diving into the OSW‑1×16 specifications, let’s clarify the trade‑offs between the two dominant optical switches technologies.

• MEMS optical switch – Uses microscopic mirrors etched on silicon. Strengths: compact size, low power consumption, and scalability to high port counts (32×32, 64×64). Weaknesses: higher insertion loss (typically 1.0–2.0 dB), sensitivity to dust and vibration, and potential for mirror stiction over time. Best suited for data center optical cross‑connects where space is tight and switching speed is moderate (ms range).

• Mechanical optical switch – Uses a prism, movable ferrule, or direct fiber alignment to physically redirect the beam. Strengths: ultra‑low loss (≤0.8 dB for 1×8, slightly higher for 1×16 but still <1.2 dB in quality designs),      extremely high crosstalk isolation (≥80 dB), and immunity to vibration once latched. Weaknesses: larger footprint, slower switching (ms range, typically ≤10 ms per adjacent channel). Ideal for test instrumentation,      network protection switching, and remote monitoring where loss budget is critical and switching occurs only occasionally.

Coray’s OSW‑1×16 belongs to the second category, but with modern refinements: modular design, epoxy‑free optical path, and parallel control interfaces that allow integration into automated test systems without custom drivers.

Inside the Coray OSW‑1×16 – Technical Features That Matter

    The OSW series (order code OSW‑1XN‑A‑B‑C‑D‑E) is available from 1×4 up to 1×32. For the 1×16 configuration, here’s what network engineers should know:

Optical Performance

• Insertion loss – ≤1.2 dB (typical <0.8 dB for 1×8; for 1×16 expect ≤1.2 dB across wavelength range). This low loss preserves optical power budget, especially when cascading multiple switches or testing passive components with tight margins.

• Wavelength range – Available in two bands: 200–850 nm (visible/NIR) or 850–1310 nm (short‑haul telecom). Testing wavelengths include 532 nm, 650 nm, 780 nm, 850 nm, 980 nm, and 1300 nm – covering most common laser sources for fiber sensing and component characterization.

• Return loss – SM ≥55 dB, MM ≥35 dB. High return loss prevents back‑reflections from destabilizing upstream DFB lasers or causing ripple in transmission measurements.

• Crosstalk – ≤ -80 dB. This is an order of magnitude better than many MEMS switches. When monitoring a specific fiber in a ring network, you don’t want leakage from other channels corrupting your OTDR trace. -80 dB ensures virtually zero interference.

• PDL,WDL, TDL –  ≤0.10 dB, ≤0.25 dB, ≤0.30 dB respectively. These low polarization, wavelength, and temperature dependent loss figures mean the switch’s insertion loss remains stable across environmental changes and signal      conditions – critical for repeatable measurements.

Reliability and Lifetime

• Repeatability – ≤±0.05 dB. In automated test systems where the same DUT is measured multiple times through different switch cycles, this tight repeatability ensures measurement uncertainty is dominated by the instrument, not the switch.

• Lifetime – 10 million cycles. While not as extreme as solid‑state’s 10^11 cycles, 10^7 operations is more than sufficient for monitoring and protection applications (e.g., one switch per minute for 19 years). The mechanical      actuator is designed for telecommunication‑grade durability.

• Optical input power – ≤1000 mW (1 Watt). High power handling allows placement after EDFAs without risk of damage – useful for amplifier transient testing or high‑power fiber laser switching.

Interface and Power Supply

• Switching time – ≤10 ms (sequential switching between adjacent channels). For protection switching, this meets the 50 ms requirement of many ring‑network standards  (e.g., ITU‑T G.8032). For test sequencing, 10 ms per channel is negligible      compared to OTDR averaging times.

• Power supply – Flexible input: AC 100–240V (worldwide mains) or DC 48V (telecom battery plant). The 1U 19” rack chassis (300×270×120 mm) fits standard equipment racks, and the parallel interface (RS232, RJ45) allows remote control via simple serial commands – no proprietary software required.

The “Epoxy‑Free” Advantage

    One of Coray’s key differentiators is an epoxy‑free optical path. In many lower‑cost switches, adhesives are used to secure fibers or prisms. Over time, these epoxies can outgas, absorb moisture, or creep under temperature cycling, causing micro‑misalignments that degrade insertion loss and repeatability. By eliminating epoxy from the light path, Coray ensures that the switch’s optical performance remains stable over its entire 10‑million‑cycle life – a detail that matters to labs running long‑term aging tests or networks deployed in uncontrolled outdoor cabinets.

Real‑World Applications of the OSW‑1×16

The combination of low loss, high isolation, and rack‑mount form factor makes the Coray 1×16 fiber optic switch suitable for three distinct use cases.

1. Remote Fiber Monitoring in Ring Networks

    Metro ring networks often consist of 8–16 nodes connected in a physical ring. To monitor fiber health without dispatching technicians, operators install an optical switch at a central hub, connecting an OTDR to the common port and each ring fiber to the switch’s output ports. The controller sequentially polls each fiber daily, looking for reflectance changes that indicate a pending cut or connector degradation. Because the OSW‑1×16 offers ≤ -80 dB crosstalk, an OTDR trace on one fiber isn’t corrupted by reflections from adjacent fibers – a common problem with cheaper switches. And with RS232 or RJ45 control, the switch can be managed by the same network management system (NMS) that handles the rest of the ring.

2. Multi‑Device Testing in Component Manufacturing

    A fiber optic component manufacturer producing 1,000 isolators or circulators per day cannot afford to manually connect and disconnect each device to a test source and power meter. A 1×16 optical switch connected to 16 DUTs (devices under test) allows automated sequencing: the switch toggles to channel 1, measures insertion loss and return loss, moves to channel 2, and so on. The repeatability of ≤±0.05 dB ensures that the variation seen across channels is due to the DUTs, not the switch. And because the switch has a lifetime of 10^7 cycles, it will outlast the production line itself.

3. WDM System Protection Switching

    In a WDM system with 16 channels, a 1×16 switch can be deployed as a “channel selector” at a reconfigurable optical add/drop multiplexer (ROADM) node for monitoring purposes. If the system’s optical spectrum analyzer (OSA) is expensive, a single OSA can be shared across all 16 channels via the switch, scanning each channel every few seconds. When a channel’s power drops below threshold, the switch can quickly (≤10 ms) reroute that channel to a backup transponder. The wide operating temperature range (-20°C to +70°C) allows such a protection scheme to be deployed in outdoor cabinets without climate control.

Ordering Flexibility – Tailoring the Switch to Your Project

Coray understands that no two integration projects are identical. The OSW‑1XN ordering code provides options for:

• Number of channels (N) – 1×4, 1×8, 1×16, 1×32 (1×16 is the focus here)

• Fiber type – SM (9/125) for telecom, MM (50/125 or 62.5/125) for short‑reach or sensing

• Wavelength – 850 nm, 1310 nm, 1550 nm, or dual 1310/1550 nm (covering C‑ and O‑bands)

• Package – 1U 19” rack (standard), or custom sizes for embedded applications

• Power supply – AC 100–240V or DC 48V

• Connector – FC/PC, FC/APC, SC/PC, SC/APC, LC, etc.

    For example, an OSW‑1×16‑SM‑1310‑1U‑S24‑FC/APC would be a single‑mode 1×16 switch optimized for 1310 nm, mounted in a 1U rack with AC power and FC/APC connectors – ideal for high‑return‑loss applications like analog video or CATV monitoring.

 Future Outlook – The Mechanical Switch Is Far from Obsolete

    With all the hype around MEMS and solid‑state devices, one might assume that mechanical optical switches are a legacy technology. But in the real world, network operators and test labs continue to buy them in large volumes because they deliver predictable, repeatable, low‑loss performance at a reasonable cost. For port counts up to 1×32, mechanical designs often beat MEMS on loss and crosstalk – two parameters that directly impact link budget and measurement accuracy.

    What’s changing is the packaging and control. Modern mechanical switches like Coray’s OSW series integrate RS232 and RJ45 interfaces, eliminating the need for proprietary parallel cables and external drivers. The 1U rack form factor aligns with standard data center and telco practices. And the epoxy‑free optical path addresses a long‑standing reliability concern.

    As networks grow denser and testing requirements become more stringent, the ability to remotely monitor 16, 32, or 64 fibers from a single instrument port will only become more valuable. The Coray OSW‑1×16 is designed to meet that need – not with trendy specifications, but with solid optical engineering and field‑hardened construction.

H2: Conclusion – A Switch You Can Rely On, Today and Tomorrow

Selecting an optical switch for your next project comes down to three questions: What’s the loss budget? How often will it switch? And what environment will it live in? For applications where loss must be under 1.5 dB, crosstalk below -70 dB, and switching speed only needs to be in the millisecond range, a mechanical 1×16 design like Coray’s OSW series is the logical choice.

Guangxi Coray Optical Communication Technology Co., Ltd. (www.coreray.com) has been supplying optical switches to telecom, sensing, and test & measurement customers for years. The OSW‑1×16 rack‑mount switch represents the culmination of that experience: modular, epoxy‑free, and equipped with standard interfaces that integrate seamlessly into your existing control infrastructure.

Whether you’re monitoring a city‑wide ring network, automating a fiber component production line, or building a shared OTDR test system, request a datasheet or sample from Coray today. And while you’re on the site, explore their solid‑state and MEMS optical switch China offerings – because sometimes the best solution is knowing which technology fits which job.