Automotive Optical Communication: The Multi-Billion Dollar Shift from Copper to Fiber

• Data Limit: Copper is capped at 10 Gbps; Fiber supports 100+ Gbps.
• Weight: Fiber is 5x lighter than copper cabling.
• interference: Fiber is naturally immune to EMI in high-voltage EVs.
• Safety: Fiber enables advanced thermal runaway sensing for batteries.

The automotive industry is about to experience a seismic shift.

While everyone’s focused on AI data centers gobbling up optical modules, a massive ¥100 billion RMB ($13.8 billion USD) market is quietly accelerating in the background: automotive optical communication.

This isn’t some distant sci-fi concept anymore.

It’s happening right now.

Major players like Hengtong Optic-Electric (Hengtong Guangdian 亨通光电), Accelink Technologies (Guangxun Keji 光迅科技), and HGTECH (Huagong Keji 华工科技) are making aggressive moves into this space, and for good reason—the traditional copper cables that have powered vehicles for decades are hitting a hard limit.

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Why Cars Need the “Bandwidth Upgrade” Right Now

Let’s talk about what’s actually happening inside modern vehicles.

With L3 autonomous driving regulations opening up, smart cockpits becoming standard, and high-level intelligent driving systems becoming the norm, the data being generated inside cars is exploding.

Here’s the problem: traditional automotive copper cables just can’t keep up.

The Numbers Tell the Story

Liu Wu (Liu Wu 刘武), a Senior Engineer at the National Key Laboratory of Optical Communication Technology and Networks of CICT (Zhongguo Xinke Jisuanji 中国信科集团), broke down the reality in stark terms:

Per-vehicle data bandwidth requirements are scaling dramatically:

• Current L2 systems: 10–50 Gbps
• Future L3 and beyond: Over 100 Gbps
• A single 17-megapixel automotive camera: Over 8 Gbps alone
• Traditional copper cable upper limit: Only 10 Gbps

In plain English?

Copper is getting crushed.

Modern vehicles are becoming mobile data centers, equipped with high-definition screens, HD cameras, and LiDAR (Jiguang Leida 激光雷达).

They’re generating and exchanging massive amounts of data every second.

The Weight and Space Problem

But there’s more to the story than just speed.

To push data through copper cables at these speeds, you need:

• Thicker cable diameters
• More complex shielding systems
• Increased weight throughout the vehicle
• More interior space consumed

In a world where every kilogram matters for EV range, this is a massive problem.

Optical fiber weighs only one-fifth as much as copper cabling while supporting data transmission of 10 Gbps and above.

The math is simple: lighter vehicle = longer range = happier customers.

The Electromagnetic Interference Issue

Here’s where it gets interesting for high-voltage NEVs.

With 800V high-voltage platforms becoming increasingly popular, there’s a new problem: electromagnetic compatibility challenges.

Strong electromagnetic fields generated by high voltage and high current can actually suppress signal quality in copper cables, causing data distortion and threatening the reliability of intelligent driving systems.

Optical fiber?

It’s naturally immune to electromagnetic interference.

As an insulating medium, it doesn’t care about electromagnetic noise—it just keeps transmitting data cleanly.

Beyond Communication: Safety Monitoring

The benefits extend beyond just raw data transmission.

Fiber optic sensing can provide accurate, distributed monitoring solutions that beat traditional electrical methods for critical safety applications like battery (Dianchi 电池) thermal runaway warning.

This is one of those “nice-to-haves” that becomes critical for next-generation vehicle architectures.

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The Telecom Industry Already Did This—20 Years Ago

Zhuang Dan (Zhuang Dan 庄丹), Executive Director and President of YOFC (Changfei Guangxian 长飞光纤), offered an illuminating historical parallel.

Two decades ago, China’s telecommunications networks underwent a massive “Light in, Copper out” transition.

Today, the ratio of fiber-to-the-home exceeds 95%.

Based on this proven playbook, the automotive industry is now repeating the same pattern.

The infrastructure already exists.

The technology is proven.

Now it’s just a matter of adaptation and scale.

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The Market Size: A 100-Billion-Yuan Opportunity

Let’s talk money, because this is where things get exciting for investors.

Global and China-Specific Projections

According to Research and Markets:

• 2026 projection: Global automotive fiber optic network market reaches $3.13 billion USD (¥22.7 billion RMB)
• 2030 projection: Expected to exceed $5.2 billion USD (¥37.8 billion RMB)

But the real story is in China specifically.

Liu Wu cited research suggesting that by 2030, China’s automotive high-speed communication and sensing market could reach ¥100 billion RMB ($13.8 billion USD).

That’s not a niche market—that’s a major industrial shift.

The Supply Chain Stack

A complete automotive fiber optic communication system requires three key components:

• Automotive optical modules
• Automotive-grade fiber optic wire harnesses
• Connectors

This creates multiple entry points for companies across the value chain.

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Who’s Making Moves Right Now?

Major players are already positioning themselves across the supply chain.

Upstream: The Chip Layer

Core component manufacturers are leading the charge:

• Everbright Photonics (Changguang Huaxin 长光华芯) has launched automotive optical chips
• Raysea (Ruixi Keji 睿熙科技) is also developing automotive-grade optical chips

The Fiber and Cable Layer

YOFC (Changfei Guangxian 长飞光纤) moved early with a strategic partnership.

In 2024, they partnered with the Dongfeng Motor Research Institute (Dongfeng Qiche Yanfa Zongyuan 东风汽车研发总院) and have already implemented “all-optical smart car” solutions on certain models, completing road tests.

This isn’t theoretical anymore—it’s production-ready.

Accelink’s Big Bet

Accelink Technologies (Guangxun Keji 光迅科技) is clearly betting big on automotive optical communication as its “second growth curve.”

In their recently finalized ¥3.5 billion RMB ($482 million USD) private placement, over ¥1 billion RMB ($138 million USD) was allocated to R&D for high-speed optical interconnection and emerging optoelectronic technologies.

That’s not a test—that’s a commitment.

Hengtong’s Comprehensive Approach

Hengtong Optic-Electric (Hengtong Guangdian 亨通光电) has developed a comprehensive automotive fiber optic communication solution set.

According to the company, these solutions achieve:

• Ultra-high-speed transmission: Over 10 Gb/s
• Bandwidth advantage: Dozens of times better than traditional copper cables

HGTECH’s Cutting Edge

During the recent “China International Optoelectronic Exposition,” HGTECH (Huagong Keji 华工科技) released its first automotive Ethernet high-speed communication optical module, achieving ultra-low latency transmission at the microsecond level.

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Two Technical Routes Competing for Dominance

The industry is splitting into two main approaches, each with distinct advantages.

Route 1: Automotive Ethernet (IEEE 802.3cz Standard)

What it does: Supports point-to-point communication

The advantage: International standards already exist and are mature

The problem: Requires a pair of optical modules for every sensor (Chuanganqu 传感器) node, which drives up costs significantly

Route 2: Automotive Passive Optical Network (PON)

What it does: Supports point-to-multipoint communication

Why it matters: Aligns better with current “Central Computing + Zone Control” architectures that automakers are adopting

How it works: Control signals from cameras, radar, and sensors are aggregated into a single network with traffic distributed as needed

The catch: PON standard protocols are still being formulated

Currently, providers like CICT (Zhongguo Xinke 中国信科) and Hengtong Optic-Electric (Hengtong Guangdian 亨通光电) have launched their own products, but widespread standardization is still in progress.

Why Automakers Should Care About This Battle

According to Liu Wu, the enthusiasm of optical communication companies for the automotive sector stems from a clear business logic.

Profits in the telecom sector are being squeezed by price wars.

But automotive-grade products command much higher premiums.

Here’s the real kicker: “A chip moving from the telecom field to the automotive field could see its price jump several times over.”

That margin structure is what’s driving the aggressive investment.

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The Momentum Is Building Across the Industry

Major automakers are taking this seriously.

Huawei (Huawei 华为), BYD (Biyadi 比亚迪), Li Auto (Lixiang 理想), and Dongfeng (Dongfeng 东风) have all continued to increase R&D investment in automotive optical communication this year.

The industry consensus has officially shifted.

The question is no longer “whether to implement it” but rather “how to implement it.”

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The Challenges That Still Need Solving

Before automotive optical communication achieves massive adoption, the industry faces three major hurdles.

Challenge 1: Cost and Technical Bottlenecks

Optical chips and modules that can withstand harsh automotive environments (-40°C to 125°C) and last over 15 years are still several times more expensive than copper solutions.

This price gap needs to narrow significantly for widespread adoption.

Challenge 2: Lack of Standards

A unified national or industry standard and testing system doesn’t yet exist.

This fragmentation restricts large-scale promotion and prevents interoperability between different manufacturers’ systems.

Challenge 3: Supply Chain Misalignment

Here’s where it gets organizational.

The development processes of optoelectronic companies and automakers are fundamentally different.

There’s a lack of effective joint development platforms between the two industries.

As one senior automotive industry expert noted: “The automotive industry was relatively closed with a very complete supply chain. It is difficult for a technology company to enter this system.”

Automotive-grade products require extremely high reliability and are sensitive to cost, yet the volume is smaller than consumer electronics (Xiaofei Dianzi 消费电子).

This requires companies to transition from a “consumer mindset” to an “automotive-grade mindset.”

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Why China Is Positioned to Lead This Shift

Despite these challenges, institutional outlooks remain optimistic.

Joyson Electronics (Junsheng Dianzi 均胜电子) stated in April that demand for automotive optical modules would explode, with large-scale implementation expected within the next five years.

Experts believe China possesses a unique dual advantage:

• China is an automotive powerhouse with massive production scale
• China is also an optical communication leader with decades of telecom infrastructure expertise

That combination of capabilities and scale provides the perfect conditions to lead this new industrial frontier.

The precedent is already set.

China led the “Light in, Copper out” transition in telecommunications.

Now it’s time for automotive.

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The Bottom Line on Automotive Optical Communication

The shift from copper to fiber in automotive is no longer a question of “if”—it’s a question of “when and how fast.”

With ¥100 billion RMB ($13.8 billion USD) in potential market value, major manufacturers already moving into production, and automakers making serious R&D commitments, this isn’t hype.

It’s infrastructure transformation.

The companies that navigate the cost, standards, and supply chain challenges first will capture outsized market share in this emerging automotive optical communication ecosystem.

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References

• “Light in, Copper out” Drives New Multi-Billion Dollar Industry – Securities Times
• Corporate News and Solutions – YOFC
• Technological Innovation in Optical Communication – Accelink Technologies
• Smart Energy and Communication Solutions – Hengtong Group