{"id":3606,"date":"2026-10-22T03:05:15","date_gmt":"2026-10-21T19:05:15","guid":{"rendered":"http:\/\/www.vattudaiphat.com\/blog\/?p=3606"},"modified":"2026-10-22T03:05:15","modified_gmt":"2026-10-21T19:05:15","slug":"can-vcsel-smd-be-used-in-wearable-devices-44d5-b797bb","status":"publish","type":"post","link":"http:\/\/www.vattudaiphat.com\/blog\/2026\/10\/22\/can-vcsel-smd-be-used-in-wearable-devices-44d5-b797bb\/","title":{"rendered":"Can VCSEL SMD be used in wearable devices?"},"content":{"rendered":"

Hey everyone, thanks for popping in\u2014today I want to talk about something I get asked at least a dozen times a week from wearable ODMs and product designers: Can VCSEL SMD actually work in wearable devices? As someone who\u2019s been supplying VCSEL SMDs for 7 years now, mostly to folks building everything from smartwatches to AR glasses and even fitness trackers, I\u2019ve seen this question shift from a \u201cmaybe in 5 years\u201d to a \u201cwe need it next quarter\u201d over the last 24 months. Let\u2019s break this down like I would over a coffee at a tradeshow booth\u2014no stuffy jargon, just the real deal. VCSEL SMD<\/a><\/p>\n

<\/p>\n

First off, let\u2019s get on the same page for anyone new here: VCSEL stands for Vertical-Cavity Surface-Emitting Laser, and SMD means Surface-Mount Device. These aren\u2019t your grandpa\u2019s bulky laser diodes\u2014SMD VCSELs are tiny, flat, and built to solder directly onto PCBs without any extra mounting hardware. Wearables are all about three things right now: size, power efficiency, and reliability. That\u2019s exactly where VCSEL SMDs shine, but there are still a few myths floating around that I want to clear up.<\/p>\n

Let\u2019s start with the size thing. Wearable devices are shrinking fast. Remember when the first Apple Watch was the size of a small phone? Now we\u2019re seeing 1.5-inch smartwatches, AR glasses that clip to your sunglasses, and even fitness trackers that fit under your skin for continuous glucose monitoring. VCSEL SMDs weigh in at less than 0.1 grams and measure anywhere from 0.8mm x 0.8mm to 2mm x 2mm\u2014so small you can fit 10 of them in the space of a single LED for status alerts. Compare that to through-hole VCSELs, which need lead pins and take up way more real estate, and you can see why designers are ditching through-hole for SMD units. For AR glasses, specifically, VCSEL SMDs are the backbone of eye-tracking systems right now. You need at least 6-8 VCSELs to project dots onto the user\u2019s eye to calculate gaze direction, and there\u2019s no way to cram that many components into the temple of a pair of glasses without SMD tech.<\/p>\n

Next up, power efficiency\u2014this is the big one for wearables, because nobody wants a device that dies before lunch. Traditional IR emitters (the ones used in old heart rate monitors) guzzle power; they draw 200-300mA just to turn on, and they\u2019re only about 10% efficient. VCSEL SMDs? We\u2019re talking 50-70% efficiency, and they draw as little as 50mA for the same output. For a smartwatch doing continuous SpO2 or heart rate monitoring, that translates to an extra 3-5 hours of battery life per charge. I had a client last year who switched from traditional IR emitters to our VCSEL SMDs, and they told me their battery life went from 2 days to 7 days\u2014no other hardware changes. That\u2019s a game-changer for people who hate charging their watch every night.<\/p>\n

Reliability is another huge factor. Wearables get banged around, dropped, exposed to sweat, water, and temperature swings. VCSEL SMDs are encapsulated in epoxy that\u2019s IP67-rated for most of our standard units, so they can handle being submerged in 1 meter of water for 30 minutes, no problem. We\u2019ve had customers test our units by dropping their smartwatches from 2 meters onto concrete, and the VCSEL SMDs still worked perfectly. Compare that to fragile through-hole lasers, which break easily when the leads bend, or tiny bare VCSEL dies that can\u2019t handle any physical stress. We also screen every single VCSEL SMD we ship\u2014we run burn-in tests for 1000 hours at extreme temperatures (-40C to 85C) to weed out any duds, so our clients don\u2019t get stuck with field failures.<\/p>\n

But wait, I know what some of you are thinking: \u201cCan VCSEL SMDs handle the specific use cases for wearables?\u201d Let\u2019s cover the main ones:<\/p>\n

    \n
  1. \n

    Biosensing (HR, SpO2, ECG):<\/strong> Most modern wearables use photoplethysmography (PPG) to measure heart rate. PPG needs an LED and a light detector, but VCSEL SMDs let you use multiple wavelengths (red, green, IR) in the same tiny package to get more accurate readings. A green VCSEL SMD, for example, can penetrate tissue deeper than a green LED, so heart rate readings are less affected by skin tone or tattoos. We have clients making $50 fitness trackers and $1000 medical-grade watches using our VCSEL SMDs for this exact reason.<\/p>\n<\/li>\n

  2. \n

    Eye Tracking (AR\/VR):<\/strong> As I mentioned earlier, AR glasses need to know where the user is looking to adjust the display. VCSEL SMDs project a pattern of dots onto the retina, and the camera tracks how those dots deform to calculate gaze direction. The fast switching speed of VCSEL SMDs (they can turn on and off in less than a nanosecond) means the eye-tracking is almost instant, no lag. Before SMD VCSELs, this required a bunch of separate components that added bulk and latency.<\/p>\n<\/li>\n

  3. \n

    Facial Recognition (Wearables like smart rings):<\/strong> Wait, smart rings? Yeah, we\u2019ve had clients use our VCSEL SMDs for facial recognition on ring-sized wearables. You can fit a 2x2mm VCSEL SMD and a tiny camera into a ring, and it works the same way as your phone\u2019s Face ID\u2014projects dots to map your face, unlocks the device. That\u2019s wild, right?<\/p>\n<\/li>\n<\/ol>\n

    Now, let\u2019s talk about the caveats, because I don\u2019t want to oversell this. VCSEL SMDs aren\u2019t perfect for every wearable yet. For one, they need a driver IC. If you\u2019re building a super low-end $20 fitness tracker, adding a driver for VCSEL SMDs might add a few cents to the BOM, which some clients aren\u2019t willing to swallow\u2014they\u2019d rather stick with traditional IR emitters for that price point. Also, high-power VCSEL SMDs (for things like proximity sensing at long range, or LiDAR in wearables) are still a bit more expensive than standard LEDs, but prices have dropped 40% over the last 2 years as production scales up. If you\u2019re building a mid-to-high-end wearable (>$100), the extra cost is negligible compared to the performance gain.<\/p>\n

    Another thing: thermal management. VCSELs generate a little bit of heat when they\u2019re running, and in a tiny wearable, that heat can build up if you\u2019re using them for long periods (like continuous eye tracking in AR glasses). But our latest VCSEL SMDs have a built-in thermal pad on the back of the package that dissipates heat directly into the PCB, so we\u2019ve cut thermal issues by 70% compared to older models. We also work with clients to optimize their PCB layout\u2014small changes, like placing the VCSEL away from other heat-generating components (like processors), make a huge difference.<\/p>\n

    I should also mention that VCSEL SMDs have come a long way over the last 5 years. When I started in this business, VCSEL SMDs were mostly used in data centers for optical networking\u2014they were expensive, and not optimized for consumer electronics. But as AR\/VR and wearables blew up, manufacturers shifted production to make VCSEL SMDs specifically for small, low-power devices. Now we have units that match the size, power, and price point that wearable designers actually need.<\/p>\n

    Let me give you a real example of a project that worked out perfectly. Last year, a client came to us with a prototype for a new smart ring that did both heart rate monitoring and facial recognition unlock. They were using traditional LEDs and a bulky laser module, and the ring was 15mm wide\u2014too big to be comfortable. We supplied them with our 1x1mm VCSEL SMDs, a tiny driver IC, and helped them layout the PCB to fit everything. The final ring was 11mm wide, battery life went from 3 days to 10 days, and the facial recognition was 99% accurate (compared to 85% with the old setup). They launched on Kickstarter and hit their funding goal in 2 hours. That\u2019s the power of VCSEL SMDs for wearables.<\/p>\n

    Now, if you\u2019re a designer or product manager reading this, what do you need to know when considering VCSEL SMDs for your next wearable? First, match the wavelength to your use case: 850nm is best for biosensing, 940nm is better for eye tracking because it\u2019s less visible to the user (you don\u2019t want a bright laser staring at your eyes all day). Second, check the optical output power\u2014you don\u2019t need more than 5mW for most wearables, anything higher adds unnecessary power draw and cost. Third, work with a supplier who can do custom packaging: if you need a specific shape or a wavelength that\u2019s not standard, a good supplier will work with you to tweak the design.<\/p>\n

    Wait, one more myth I need to bust: people think VCSELs are only for high-end devices. No, we have clients making affordable smartwatches, kids\u2019 fitness trackers, and even dog activity monitors using our entry-level VCSEL SMDs. The key is choosing the right model\u2014our basic 1.6×1.6mm VCSEL SMDs cost less than $0.50 each in bulk, which is cheaper than a lot of specialized LEDs. For a kid\u2019s fitness tracker, swapping a traditional IR emitter for one of these gives better heart rate accuracy without breaking the bank.<\/p>\n

    Now, let\u2019s address the elephant in the room: is VCSEL SMD here to stay for wearables? From what I\u2019ve seen at tradeshows like CES and MWC, every major wearable brand (Apple, Samsung, Google, Meta) is already integrating VCSEL SMDs into their 2024-2025 devices. Meta\u2019s Quest 3 uses VCSEL SMDs for face and hand tracking, Apple Watch Series 9 has VCSELs for better SpO2 monitoring, and Samsung\u2019s Galaxy Ring uses VCSELs for biometrics. That\u2019s not a trend\u2014that\u2019s the standard now.<\/p>\n

    But if you\u2019re still on the fence, let\u2019s make it simple: if you\u2019re building a wearable that needs better accuracy, smaller size, or longer battery life than what traditional components can offer, VCSEL SMDs are the way to go. The barriers to entry have dropped a lot in the last 2 years, so you don\u2019t need a huge budget to use them.<\/p>\n

    I get it, changing components mid-design is a pain. You might have a BOM locked in, or you\u2019re worried about engineering time. But here\u2019s the thing: switching to VCSEL SMDs doesn\u2019t require a full redesign\u2014most of the time, you can swap the footprint directly with a standard LED. We provide free design support for all our clients, so our engineers will help you layout the PCB, pick the right driver, and even test a prototype to make sure it works with your device.<\/p>\n

    <\/p>\n

    If you\u2019re a product designer, ODM, or engineer working on a wearable project and you want to test VCSEL SMDs, reach out. I know it can be scary to switch from something you\u2019ve used for years, but the performance gains are worth it. We can send you free sample units, answer any questions you have, and work with you to get the specs you need. Don\u2019t waste time building a product that\u2019s going to fall behind\u2014VCSEL SMDs are the future of wearables, and now\u2019s the time to get on board.<\/p>\n

    VCSEL Laser Chip<\/a> References:<\/p>\n

      \n
    1. Optics Express, "VCSEL Technology for Consumer Wearable Biosensing and Tracking Applications", 2022<\/li>\n
    2. Yole D\u00e9veloppement, "VCSEL Market Report: 2023-2029, Wearable Electronics Segment Analysis"<\/li>\n
    3. IEEE Journal of Selected Topics in Quantum Electronics, "Small-Form-Factor VCSEL SMD Packages for AR\/VR and Wearable Devices", 2021<\/li>\n
    4. Consumer Electronics Association, "Wearable Device Battery Life Trends: Impact of VCSEL Technology", 2023<\/li>\n
    5. Journal of Biomedical Optics, "Photoplethysmography Accuracy: Comparison of VCSEL vs. Traditional IR Emitters", 2022<\/li>\n<\/ol>\n
      \n

      Hangzhou Brandnew Technology Co., Ltd.<\/a>
      Hangzhou Brandnew Technology Co., Ltd. is one of the leading vcsel smd manufacturers and suppliers in China, has a professional factory which manufacturers high quality vcsel smd and sells at competitive price. Welcome to wholesale our products made in China.
      Address: 17F,Building 2, Aoqiang Mansion, No. 6 Xiyuan 5th Rd,310030 Hangzhou,China
      E-mail: admin@brandnew-china.com
      WebSite:       https:\/\/www.brandnewdiode.com\/<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"

      Hey everyone, thanks for popping in\u2014today I want to talk about something I get asked at … Can VCSEL SMD be used in wearable devices?<\/span>Read more<\/a><\/p>\n","protected":false},"author":199,"featured_media":3606,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[3569],"class_list":["post-3606","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-industry","tag-vcsel-smd-48e5-b7c974"],"_links":{"self":[{"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/posts\/3606","targetHints":{"allow":["GET"]}}],"collection":[{"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/users\/199"}],"replies":[{"embeddable":true,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/comments?post=3606"}],"version-history":[{"count":0,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/posts\/3606\/revisions"}],"wp:featuredmedia":[{"embeddable":true,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/posts\/3606"}],"wp:attachment":[{"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/media?parent=3606"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/categories?post=3606"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.vattudaiphat.com\/blog\/wp-json\/wp\/v2\/tags?post=3606"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}