Lumentum R64 Optical Circuit Switch: 7 Questions to Ask Before You Buy

Everything you wanted to know about the Lumentum R64 (and a few things you didn’t know you needed to ask)

So, you’re looking into the Lumentum R64 optical circuit switch. Maybe you’re spec’ing out a new test setup, or you’re trying to reconfigure a fiber-optic network. I’ve been in the trenches with these systems for a while now, and I get the same batch of questions over and over. Here are the seven I think are most important—from the obvious to the ones that’ll save you a headache later.

1. What is the Lumentum R64, exactly?

Think of the Lumentum R64 as a super-precise, automated patch panel. Instead of manually unplugging and plugging fibers to re-route a signal, you do it via software. It’s a 64-port optical circuit switch based on Lumentum’s silicon photonics technology. The big selling point is that it’s strictly non-blocking. That means any input port can connect to any output port simultaneously without interference. It’s a critical piece of gear for labs doing automated testing or telecom companies managing complex fiber routes.

2. How fast is the switching speed? (This one is tricky)

Most people assume ‘circuit switch’ means near-instantaneous, like a network router. That’s a misconception. The actual switching time is around 10-20 milliseconds (based on Lumentum’s literature as of late 2024). That’s incredibly fast for a physical optical circuit—not much slower than a MEMS-based switch, and way more reliable. But here’s the insider part: the total time to establish a connection isn’t just the switch speed. It also includes the software control latency and the command time from your automation framework. So, if you’re trying to run it at sub-10ms throughput, you need to budget time for the whole chain, not just the switch chip.

3. Does the 'NeoPhotonics acquisition' matter for the R64?

It does, but not in the way you might think. Lumentum acquired NeoPhotonics back in 2022. The R64 is a Lumentum product (it’s not the same as NeoPhotonics’ old line of switches). The relevance is that the acquisition massively strengthened Lumentum’s position in silicon photonics and high-speed optics. For you, that means better long-term support and a deeper roadmap, especially if your setup involves both optical switching and high-bandwidth transceivers. It’s not about the product number changing; it’s about the underlying capability of the company as a whole.

4. What's the optical performance like? (Insertion loss and PDL)

Honestly, this is where these switches shine—when they’re working. The typical insertion loss is around 1.0 to 1.5 dB, which is excellent for a non-blocking matrix of this size. Polarization Dependent Loss (PDL) is usually under 0.2 dB. I say ‘when they’re working’ because a few years ago, in Q1 2023, we had a batch of 30 R64s that had a strange, intermittent PDL bounce. It took us a week to isolate it to a faulty batch of optical connectors on the front panel. Not a Lumentum design flaw, but a manufacturing QA hiccup. The point is: always verify the spec sheet with a test run. (Take this with a grain of salt, as that was a specific manufacturing batch.)

5. Can I use it with any laser machine or professional laser manufacturing systems?

Not directly, and this is a common question. The R64 is designed to switch continuous or modulated optical signals—like telecom/data-com signals in the O, C, and L bands (around 1260nm to 1625nm). It is not designed for high-power industrial fiber lasers used in cutting or welding. If you plugged a 2kW cutting laser into an R64, you’d probably vaporize the optical path immediately. If you’re a laser cutting manufacturer looking for beam routing, you need a different system (often based on diffractive optics or galvanometers). The R64 is for the control and measurement of light, not the industrial processing of materials.

6. What about alternatives? (Vendor won’t tell you this)

Here’s something vendors won’t tell you: The main competition for the R64 isn’t just other optical switch companies like Polatis or HUBER+SUHNER. It’s a simpler, cheaper alternative: a high-quality optical patch panel and a manual patching job. If your test setup reconfigures once a week, a manual panel costs nothing and has zero insertion loss variation. The R64 makes sense when you need automation (e.g., a 48-hour test with reconfigurations every 5 minutes). For a one-off project, buying an R64 is huge overkill. Also, no one talks about the cost. A fully-populated unit can run close to $15,000-$25,000 (based on quotes I’ve seen in late 2024).

7. How do I repair or get support for a broken unit?

This is the most frustrating part. The R64 is a complex piece of gear with active electronics (the control board) and passive optics (the silicon photonic die). If the control board fails, Lumentum’s repair program is usually decent—they have a depot repair service. But if the optical die itself fails, the repair is often a replacement. In 2023, we had a unit die after a year. The support was professional, but the turnaround was 4 weeks because the module had to be sent to the factory in San Jose. We now keep a spare unit on the shelf. More importantly, the most common failure? The RJ-45 management port gets fried by static electricity. A simple $20 ESD-safe USB adapter has saved us two units since.

Prices as of late 2024; verify current rates with Lumentum for the latest specs.