100G QSFP28 SR4 vs. LR1 Optical Module : A Quick Guide for Optimal Selection
As data centers evolve, choosing between 100G QSFP28 SR4 and LR1 optical modules becomes critical for cost-effective networking. Here's a concise comparison to guide your decision:
Core Differences
- SR4: Optimized for short-range multimode fiber (MMF) connections up to 100m, it uses an MPO-12 connector and 850nm VCSEL lasers, ideal for high-density rack-to-rack links in data centers.
- LR1: Designed for single-mode fiber (SMF) with a 1310nm EML laser and LC connector, it achieves 10km reach, making it suitable for metro networks or cross-campus interconnects.
2. Application Scenarios
- SR4 excels in cost-sensitive, high-density environments like AI training clusters or hyperscale data centers where <100m links dominate.
- LR1 shines in long-haul scenarios, such as connecting distributed cloud nodes or 5G core networks, with simplified single-wavelength PAM4 modulation.
Key Trade-offs
- SR4: Lower upfront cost, limited to short distances.
- LR1: Higher reach with slightly elevated power consumption