In the 100G optical module market, QSFP-100G-SR4, as an important member of the QSFP28 packaging family, has become the preferred solution for short-distance interconnection in data centers with its high density, low power consumption and short-distance transmission advantages. This article will analyze its key value from the dimensions of technical characteristics, core advantages and selection practices.
Characteristics and Working Principle
QSFP-100G-SR4 is a parallel multimode optical module that uses 4× 25G NRZ modulation technology and realizes 4-channel independent transmission and reception through 8/12-core MTP/MPO interfaces. Its core parameters include:
Wavelength and transmission distance: The working wavelength is 850nm, and the transmission distance is 70 meters when paired with OM3 multimode optical fiber, and 100 meters with OM4 optical fiber.
Physical structure: Complies with QSFP28 MSA and IEEE 802.3bm standards, built-in digital diagnostic function (DDM), supports real-time monitoring of optical power, temperature and other states.
Working principle: The electrical signal is converted into an optical signal through 4 VCSEL lasers, transmitted in parallel through multimode optical fiber, and restored to an electrical signal by 4 array PIN photodiodes at the receiving end.
Core Advantage
High density and low power consumption
Compared with CFP and other packages, QSFP28 is smaller in size and supports higher port density (such as 36 ports can be deployed on a 1U switch panel), with a typical power consumption of only 2.5W, which significantly reduces the energy consumption of data centers.
Economic efficiency and compatibility
The cost of multimode optical fiber is lower than that of single-mode optical fiber, and QSFP-100G-SR4 is compatible with mainstream brand equipment such as Huawei, Cisco, and H3C, supporting flexible deployment across manufacturers.
Short-distance transmission optimization
Designed for short-distance scenarios such as data center cabinets and switch stacking, it avoids the high-cost redundancy of long-distance modules (such as LR4).
Typical Application Scenarios
Internal interconnection in data centers
Used for 100G link connection between TOR (top-of-rack switch) and LEAF switch, supporting high-bandwidth services such as cloud computing and virtualization clusters.
5G fronthaul network
Provides short-distance transmission channels with low latency and high reliability between base stations and distributed units (DUs).
Core layer of enterprise campus network
Supports high-speed interconnection between core switches and aggregation layers to meet the needs of video conferencing, big data analysis, etc.
Selection and Deployment Recommendations
Fiber type matching
OM4 fiber is preferred to maximize the transmission distance (100 meters), and OM3 fiber needs to be controlled within 70 meters.
Link topology adaptation
Requires MTP/MPO-LC branch jumpers to achieve hybrid networking with 10G/25G devices.
Compatibility verification
Although QSFP-100G-SR4 is designed for multi-brand compatibility, some manufacturers’ equipment may limit non-certified modules. It is recommended to test in advance or choose pre-coding modules.
Comparison of alternatives
If the distance exceeds 100 meters, it can be upgraded to QSFP28 PSM4 (500 meters single mode) or QSFP28 CWDM4 (2 kilometers single mode), but the cost will increase significantly.
Future Development Trend
With the popularization of 200G/400G networks, QSFP-100G-SR4 will remain competitive in short-distance scenarios. Its technical architecture (such as parallel VCSEL design) lays the foundation for the next generation of SR8 modules (such as 200G QSFP-DD SR8), supporting smooth upgrades to higher density networks.
Summary
QSFP-100G-SR4 has become a benchmark solution for 100G short-distance transmission with high cost performance and low deployment complexity. Users need to combine specific transmission needs, fiber resources and equipment ecology to comprehensively select models to give full play to its performance advantages in data centers and enterprise networks.