In 2023, amid the AGI boom, computing power took center stage in global digital infrastructure. Beyond NVIDIA GPUs' dazzling performance, Mellanox switching equipment also surged unexpectedly, emerging as the biggest dark horse. This is because, with compute-fabric convergence, communication has become the core bottleneck in large-scale distributed computing systems, with even half of the time consumed by data communication. Consequently, various innovative optical solutions have arisen, heralding a golden decade for photonics.
By most measures, 2023 marks the first year of the AI era, witnessing explosive growth in NVIDIA-led 800G/400G single-mode and multi-mode product deployments. The typical applications for 800G/400G NVIDIA multi-mode optical modules are illustrated below:
The optical modules involved are: the 800G OSFP SR8 (Dual MPO) and the breakout 400G OSFP/QSFP112 SR4 modules. Next, we will focus on the optical module solutions provided by COBTEL.
800G QSFP-DD/OSFP SR8/AOC (8x 100G PAM4)
Product Features:
1.Optical Interface Protocol: IEEE 802.3db 400GBASE-SR4
2. Electrical Interface Protocol: IEEE802.3ck: 800GAUI-8 QSFP DD MSA or
3. OSFP MSA
4. Software Protocol: CMIS-4.0
5. Power Consumption: <13.5 W
6. Mature Chip Solution:
7. Broadcom DSP + Macom Driver/TIA
8. Broadcom VCSEL/PD Solution
9. OM4 100m Pass-through FEC, Pre-FEC BER ~E-7, suitable for 100G PAM4 applications
10. MPO16 APC Connector
Product Functional Block Diagram
Product Internal Schematic Diagram
800G QSFP-DD SR8 Product Exploded View
400G OSFP-RHS(Flat-top) SR4
Product Features
1. 4x106.25Gbps PAM4 Transmitter and PAM4 Receiver
2. 4-channel 850nm VCSEL Array
3. 4-channel PIN Photodetector Array
4. Power Consumption <8W
5. Hot-pluggable OSFP Form Factor, CMIS Compatible
6. Maximum Link Length: 60m over OM3 MMF, 100m over OM4 MMF with FEC
7. MPO12 APC Connector
8. Operating Case Temperature: 0°C ~ +70°C
1. 4x106.25Gbps PAM4 Transmitter and PAM4 Receiver
2. 4-channel 850nm VCSEL Array
3. 4-channel PIN Photodetector Array
4. Power Consumption <8W
5. Hot-pluggable OSFP Form Factor, CMIS Compatible
6. Maximum Link Length: 60m over OM3 MMF, 100m over OM4 MMF with FEC
7. MPO12 APC Connector
8. Operating Case Temperature: 0°C ~ +70°C
Product Functional Block Diagram
400G QSFP112 SR4
Product Features:
1. 4-lane Full-Duplex Transceiver Module
2. 4 channels, each at 106.25G
3. 4x106.25Gbps PAM4 Transmitter and PAM4 Receiver
4. 4-channel 850nm VCSEL Array
5. 4-channel PIN Photodetector Array
6. Power Consumption <8W
7. Hot-pluggable QSFP112 Form Factor, CMIS Compliant
8. Maximum Link Length: 60m over OM3 MMF, 100m over OM4 MMF with FEC
9. MPO12 APC Connector
10. Operating Case Temperature: 0°C ~ +70°C
Product Functional Block Diagram
Complimentary Fiber Patch Cord Solution: Both the 400G OSFP-RHS(Flat-top) SR4 and 400G QSFP112 SR4 optical modules use MPO12 multi-mode patch cables, OM4, Type B, MPO/APC.
Now, let's look at the typical applications for 800G/400G NVIDIA single-mode optical module products, as shown below:
Here, the involved optical modules are: 800G OSFP DR8/DR8+ (Siph), 400G OSFP-RHS DR4 (Siph), and 400G QSFP112 DR4(Siph). Next, we focus on COBTEL's solutions. For its single-mode 800G/400G products, COBTEL leverages silicon photonics technology.
The core technology of EasyFlyTech's silicon photonics modules lies in its innovative free-space COB high-coupling-efficiency packaging design and MZI (Mach-Zehnder Interferometer) software locking algorithm. For the silicon photonic waveguide core, the company has also collaborated with partners on multiple co-design iterations of the silicon photonic chips.
800G OSFP DR8/DR8+ (Siph)
Product Features
1. Optical Interface Protocol: IEEE 802.3cu 8X 100GBASE-DR
2. Electrical Interface Protocol: IEEE802.3ck: 800GAUI-8
3. Form Factor: OSFP MSA
4. Software Protocol: CMIS-Rev 5.2
5. Power Consumption: <18.5W
6. Mature Chip Solution:
a. Broadcom DSP + 4X CWL, 2X DR4 SiPh PIC, 2 DR4 TIAs,
b. 2 DR4 PDs
c. COB SiPh Platform
d. DR8 OM4 500m Pass-through FEC, Pre-FEC BER ~E-7, suitable for 100G PAM4 applications
e. MPO16 APC Interface (DR 500M, DR+ 2KM)
a. Broadcom DSP + 4X CWL, 2X DR4 SiPh PIC, 2 DR4 TIAs,
b. 2 DR4 PDs
c. COB SiPh Platform
d. DR8 OM4 500m Pass-through FEC, Pre-FEC BER ~E-7, suitable for 100G PAM4 applications
e. MPO16 APC Interface (DR 500M, DR+ 2KM)
Product Functional Block Diagram
Product Internal Schematic Diagram
400G OSFP-RHS DR4 (Siph)
Product Features
1. OSFP MSA and CMIS Compatible
2. 4x106.25Gbps (53.125GBd PAM4) Electrical Interface
3. 4x106.25Gbps (53.125GBd PAM4) Optical Interface
4. Power Consumption <10W
5. Maximum Link Length: 500m over G.652 SMF with KP-FEC
6. MPO-12 Connector
7. Built-in Digital Diagnostic Monitoring (DDM)
8. Operating Case Temperature: 0°C ~ +70°C
9. 3.3V Operating Voltage
10. RoHS Compliant (Lead-Free)
1. OSFP MSA and CMIS Compatible
2. 4x106.25Gbps (53.125GBd PAM4) Electrical Interface
3. 4x106.25Gbps (53.125GBd PAM4) Optical Interface
4. Power Consumption <10W
5. Maximum Link Length: 500m over G.652 SMF with KP-FEC
6. MPO-12 Connector
7. Built-in Digital Diagnostic Monitoring (DDM)
8. Operating Case Temperature: 0°C ~ +70°C
9. 3.3V Operating Voltage
10. RoHS Compliant (Lead-Free)
Product Functional Block Diagram
400G QSFP112 DR4(Siph)
Product Features
1. Compliant with QSFP112 MSA and CMIS
2. 4x106.25Gbps (53.125GBd PAM4) Electrical Interface
3. 4x106.25Gbps (53.125GBd PAM4) Optical Interface
4. Power Consumption <10W
5. Maximum Link Length: 500m over G.652 SMF with KP-FEC
6. MPO-12 Connector
7. Built-in Digital Diagnostic Monitoring (DDM)
8. Operating Case Temperature: 0°C ~ +70°C
9. 3.3V Operating Voltage
10. RoHS Compliant (Lead-Free)
Complimentary fiber optic patch cords Solution: Both the 400G OSFP-RHS DR4 (Siph) and 400G QSFP112 DR4(Siph) optical modules use MPO12 single-mode patch cables, Type B, MPO/APC.
Beyond the 800G/400G NVIDIA single-mode and multi-mode optical module solutions described above, 800G DAC is also a cost-effective solution for short-distance transmission in AI data centers. Next, we introduce the typical applications for 800G NVIDIA direct-attach and breakout DAC products. The following diagram shows the typical application for the 800G NVIDIA direct-attach DAC Cable:
COBTEL provides solutions for the direct-attach DACs involved here: the 800G OSFP DAC and 800G QSFP-DD DAC.
AI Data Center 400G/800G DAC Overview:
This solution delivers exceptional 44GHz signal integrity. Its 800G testing with KP4-FEC complies with IEEE standards, achieving Post-FEC BER < 1E-15, an FEC margin > 27%, and zero FEC frame loss rate. It uses a Re-Driver solution that offers low power consumption (~2.5W) and latency (<20ns), making it more efficient than Re-Timer solutions. Innovative production techniques ensure high reliability. The 800G QSFP-DD ACC 26AWG 4m cable weighs approximately 600g.
Product Features:
1. Compliant with IEEE P802.3ck D3.0 and QSFP-DD800 & OSFP MSA
2. Compliant with IEEE802.3ck standard
3. Uses 16 pairs of copper cable
4. Supports 8-lane bidirectional transmission at 112GB/s
5. Passive Copper Cable (PCC) supports 2m, with insertion loss better than 19.75dB@26.56GHz
6. 800G Active Copper Cable (ACC) reaches up to 5m
7. Channel Operating Margin (COM) exceeds 3dB under conditions of 8 near-end and 7 far-end crosstalk sources
8. Commercial BER testing and MCB environments show Pre-FEC BER better than 1E-5 (Post-FEC BER better than 1E-15)
9. 800G DAC Channel Insertion Loss.
10. 800G DAC Channel COM (Including Crosstalk)
Finally, we briefly introduce the typical application for the 800G NVIDIA breakout DAC product line, as shown below:
COBTEL's 800G breakout DAC solutions include: the 800G OSFP to 2x400G OSFP112 Breakout DAC and the 800G QSFP-DD to 2x400G QSFP112 Breakout DAC.
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