---
title: "WL YAN (@hcoptical) | Hashnode"
description: "HC OPTICAL takes optical communication, Internet of Things and data center as the core business development, focusing on the research and development, produc..."
url: "https://hashnode.com/@hcoptical"
---

@hcoptical

# WL YAN

@hcoptical · Joined June 2026

[Website](https://www.glhclink.com/)

### [Large Core Fiber Patch Cords: General-Purpose vs Infrared vs UV Specialty Fibers](https://glhclink.hashnode.dev/large-core-fiber-patch-cords-general-purpose-vs-infrared-vs-uv-specialty-fibers?utm_source=hashnode&utm_medium=feed)

A large core fiber patch cord is not simply a scaled-up telecom fiber. Standard single-mode fiber uses a ~9 µm core and multimode fiber uses 50/62.5 µm cores, both optimized for data transmission. A l

8 min read · [glhclink.hashnode.dev](https://glhclink.hashnode.dev/large-core-fiber-patch-cords-general-purpose-vs-infrared-vs-uv-specialty-fibers?utm_source=hashnode&utm_medium=feed)

[Nov 2](https://hashnode.com/posts/large-core-fiber-patch-cords-general-purpose-vs-infrared-vs-uv-specialty-fibers/6ae82556ff039bf8ca7e96c4)

### [The Lithium Niobate IQ Modulator: for High-Order Coherent Optical Transmission](https://glhclink.hashnode.dev/the-lithium-niobate-iq-modulator-for-high-order-coherent-optical-transmission?utm_source=hashnode&utm_medium=feed)

In high-capacity coherent optical systems, mapping complex electrical signals onto an optical carrier with high spectral efficiency is essential. The lithium niobate IQ modulator is designed for this

7 min read · [glhclink.hashnode.dev](https://glhclink.hashnode.dev/the-lithium-niobate-iq-modulator-for-high-order-coherent-optical-transmission?utm_source=hashnode&utm_medium=feed)

[Oct 26](https://hashnode.com/posts/the-lithium-niobate-iq-modulator-for-high-order-coherent-optical-transmission/6adec8a982f424404f1faa7a)

### [Intensity Modulators Explained: LiNbO₃ vs. TFLN, Key Specs, and How to Choose](https://glhclink.hashnode.dev/intensity-modulators-explained-linbo-vs-tfln-key-specs-and-how-to-choose?utm_source=hashnode&utm_medium=feed)

Intensity modulators sit at the heart of many photonic systems, yet they are often treated as a black box until link budgets tighten or bandwidth demands climb. Whether you are building an RF-over-fib

6 min read · [glhclink.hashnode.dev](https://glhclink.hashnode.dev/intensity-modulators-explained-linbo-vs-tfln-key-specs-and-how-to-choose?utm_source=hashnode&utm_medium=feed)

[Oct 23](https://hashnode.com/posts/intensity-modulators-explained-linbo-vs-tfln-key-specs-and-how-to-choose/6adac9f00f036ba695b093be)

### [Choosing a Lithium Niobate Phase Modulator: A Spec-by-Spec Decision Guide](https://glhclink.hashnode.dev/choosing-a-lithium-niobate-phase-modulator-a-spec-by-spec-decision-guide?utm_source=hashnode&utm_medium=feed)

An electro-optic phase modulator is one of the few photonic components that changes the phase of light without touching its intensity. That single capability sits at the center of coherent optical com

9 min read · [glhclink.hashnode.dev](https://glhclink.hashnode.dev/choosing-a-lithium-niobate-phase-modulator-a-spec-by-spec-decision-guide?utm_source=hashnode&utm_medium=feed)

[Oct 19](https://hashnode.com/posts/choosing-a-lithium-niobate-phase-modulator-a-spec-by-spec-decision-guide/6ad5c642280cbbabceeba43b)

### [How MEMS Optical Switches Are Solving the High-Speed Optical Module Test Bottleneck](https://glhclink.hashnode.dev/how-mems-optical-switches-are-solving-the-high-speed-optical-module-test-bottleneck?utm_source=hashnode&utm_medium=feed)

The AI infrastructure boom has pushed optical modules into a rapid upgrade cycle. 800G modules are already in large-scale mass production, 1.6T modules are entering batch delivery, and 3.2T+ products

6 min read · [glhclink.hashnode.dev](https://glhclink.hashnode.dev/how-mems-optical-switches-are-solving-the-high-speed-optical-module-test-bottleneck?utm_source=hashnode&utm_medium=feed)

[Oct 12](https://hashnode.com/posts/how-mems-optical-switches-are-solving-the-high-speed-optical-module-test-bottleneck/6acc4501be51c415d56dfe8b)