As of March 23, 2026

The Optical Networking and Silicon Photonics sector is showing strong bullish momentum, led by a massive surge in $TSEM. This follows Tower Semiconductor's announcement of a breakthrough 400 Gbps/lane data transmission demonstration using a production-ready silicon photonics process alongside Coherent, combined with a newly announced AI networking partnership with Oriole Networks (seekingalpha.com/news/4…).

The broader market narrative highlights the accelerating transition from traditional copper interconnects to high-speed silicon photonics within AI data centers. As artificial intelligence workloads demand ultra-low latency and higher bandwidth, investors are heavily rewarding specialized foundries and optical component manufacturers capable of scaling next-generation optical circuit switching and power management.

$TSEM: 8.41%

$CIEN: 7.16%

$FN: 6.58%

$GLW: 6.30%

$LITE: 4.76%

$FORM: 4.65%

$KEYS: 4.39%

$SLOIF: 4.25%

$AAOI: 3.18%

$AEHR: 3.04%

$AXTI: 3.01%

$GFS: 2.97%

$MRVL: 2.82%

$COHR: 2.05%

$BESIY: 2.00%

$SPX: 1.67%

$NDX: 1.51%

$SOI: 1.39%

$POET: -0.42%

$LWLG: -2.36%

$IQE: -2.83%

$ALMU: -3.39%

1. Silicon Photonics and Specialty Foundries

$TSEM, $MRVL, $GFS, $SOI: These companies are the foundational manufacturers of mixed-signal and silicon photonics chips powering AI infrastructure.

$TSEM: The primary beneficiary of the AI optical routing transition, capitalizing on its unique open-platform SiPho PDK and recent strategic partnerships.

2. Optical Communications and Transceivers

$CIEN, $FN, $LITE, $COHR, $AAOI: These firms provide the critical optical transport systems and transceivers required to alleviate data center bottlenecks.

$POET, $LWLG: These early-stage players are facing near-term volatility as the market favors proven, scaled production from established vendors despite their innovative electro-optic polymer technologies.

3. Infrastructure, Equipment, and Materials

$GLW, $FORM, $KEYS, $AEHR, $BESIY: Providing essential physical infrastructure like optical fiber, testing equipment, and advanced packaging systems necessary for AI cluster deployment.

$AXTI, $SLOIF, $IQE, $ALMU: Operating as key suppliers of substrate materials and niche optoelectronic components, supporting the broader photonics supply chain.

4. Broad Market Benchmarks

$SPX, $NDX: Representing the S&P 500 and Nasdaq 100 indices, providing a baseline to show that the optical networking sector is significantly outperforming the broader market rally.