Tech-dat/Network-dat/fiber-optic-dat/fiber-optic-cable-dat/POF-dat/HFBR-dat/HFBR-dat.md
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Output ─────► MCU RX
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GND ─────────┴──────────────────
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+## 🧩 2. Integrated Fiber Optic Transceivers
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+
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+These are dedicated fiber optic ICs that handle the light/electrical signal conversion for **analog or digital baseband signals** — suitable for video.
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+
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+### 🔹 Avago HFBR-0500 Series (Now Broadcom)
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+- **HFBR-1521** – Transmitter
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+- **HFBR-2521** – Receiver
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+
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+**✔ Features:**
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+- Accept **analog or digital signals** (bandwidth limited to ~50 MHz)
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+- Compatible with **1 mm Plastic Optical Fiber (POF)**
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+- Accepts **TTL or analog-like baseband** signals
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+- Can work with **buffered composite/S-video signals**
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+
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+> **Note:** For pure analog video, you’ll need **pre-emphasis or buffering** before the transmitter to match signal levels.
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+
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## ref
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