# 800G Optical Transceivers: Deploying Next-Gen Optics in AI Data Centers

## Introduction

AI training clusters are pushing network bandwidth to unprecedented levels. NVIDIA's GB200 NVL72 racks, Google's TPU v5 pods, and Meta's next-gen infrastructure all demand 800G optical interconnects. APEX GROUP LIMITED, as a manufacturer and distributor of optical transceivers, is at the forefront of this transformation.

## The 800G Optical Landscape

### Form Factor Evolution

| Generation | Form Factor       | Max Speed | Typical Reach |

| ---------- | ----------------- | --------- | ------------- |

| 100G era   | QSFP28            | 100G      | 100m - 10km   |

| 400G era   | QSFP-DD / OSFP    | 400G      | 100m - 10km   |

| 800G era   | QSFP-DD800 / OSFP | 800G      | 100m - 2km    |

| 1.6T era   | OSFP-XD           | 1.6T      | 100m - 500m   |

### 800G Optical Module Types

**SR8 (Short Reach)**

- 8×100G PAM4 over multi-mode fiber

- 100m reach using parallel optics

- Use case: GPU-to-switch within rack/row

**DR8/DR4 (Datacenter Reach)**

- 8×100G or 4×200G over single-mode fiber

- 500m-2km reach

- Use case: Leaf-to-spine fabric

**FR4 (CWDM4)**

- 4×200G CWDM over duplex SMF

- 2km reach

- Use case: Inter-building connections

**2×FR4 (800G Breakout)**

- Two independent 400G FR4 in single OSFP/QSFP-DD

- Enables 2:1 breakout to 400G ports

- Use case: Migration from 400G to 800G switches

## Apex Optical Transceiver Portfolio

### 800G Products (Apex Brand)

- **Apex 800G-DR8 OSFP**: 8×100G PAM4, 500m SMF

- **Apex 800G-2×FR4 OSFP**: Dual 400G CWDM4, 2km

- **Apex 800G-SR8 QSFP-DD**: 8×100G, 100m MMF

### Coherent Solutions (Distributed)

- **Acacia 400G/800G CFP2-DCO**: For DCI and metro applications

- **Coherent 100G/400G ZR**: Edge-optimized coherent

- **Hisilicon 800G DCO**: Next-gen DSP for long-haul

### Legacy & Migration

- **QSFP28 100G**: CWDM4, LR4, SR4

- **QSFP-DD 400G**: DR4, FR4, SR8

- **SFP28 25G**: SR, LR for server connectivity

## AI Data Center Optical Architecture

### NVIDIA DGX SuperPOD Reference

```

Compute → 800G OSFP/QSFP-DD → Leaf Switch (51.2T)

                                     ↓

                                Spine Switch (51.2T)

                                     ↓

                                Core Router → DCI (400G/800G Coherent)

```

### Key Design Considerations

1. **Link Budget**: 800G DR8 requires <4dB insertion loss for 500m reach

2. **FEC (Forward Error Correction)**: Concatenated FEC adds 14-15% overhead

3. **Thermal Management**: 800G modules dissipate 14-18W vs 10-12W for 400G

4. **Fiber Infrastructure**: Migrate from OM4 to OM5 MMF or SMF for future-proofing

5. **Breakout vs. Native 800G**: Consider 2×400G breakout for mixed environments

## Why Choose APEX for Optical Transceivers?

1. **Manufacturer + Distributor**: Own brand Apex 800G transceivers + authorized distribution for Acacia, Coherent, Hisilicon, Accelink

2. **AI-Optimized Portfolio**: Full 800G ecosystem covering SR to coherent

3. **Technical Pre-Sales**: Engineering team validates compatibility with your switch platforms

4. **Global Logistics**: Inventory in Hong Kong with 3-5 day worldwide delivery

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*Contact APEX GROUP for optical transceiver solutions: Info@apexallinone.com*

*Visit: www.apexallinone.com*