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Selecting the optimal 100G QSFP28 transceiver requires understanding the key differences between SR4, LR4, and CWDM4 modules. The following comparison table based on FB-LINK's actual product specifications helps you identify the right solution for your network requirements.
| Specification | 100G QSFP28 SR4 | 100G QSFP28 CWDM4 | 100G QSFP28 LR4 |
|---|---|---|---|
| Data Rate | 103.125Gbps (4×25.78Gbps) | 103.125Gbps (4×25.78Gbps) | 103.125Gbps (4×25.78Gbps) |
| Wavelength | 850nm | 1271/1291/1311/1331nm | 1295-1310nm (LAN WDM) |
| Fiber Type | MMF (OM3/OM4) | SMF (G.652) | SMF (G.652) |
| Max Distance | 70m (OM3) / 100m (OM4) | 2km | 10km |
| Connector | MTP/MPO-12 | Duplex LC | Duplex LC |
| Fiber Count | 8 fibers (4 Tx + 4 Rx) | 2 fibers (1 Tx + 1 Rx) | 2 fibers (1 Tx + 1 Rx) |
| Transmitter Type | VCSEL 850nm | DFB/DML | 4× LAN WDM EML |
| Receiver Type | PIN | PIN | PIN |
| Tx Power | -8.4 ~ 2.4 dBm | -1.4 ~ 4.5 dBm | -4.3 ~ 4.5 dBm |
| Rx Sensitivity | -10.3 dBm | -6.5 dBm | -10.6 dBm |
| Technology | Parallel Multimode | CWDM (4λ multiplexing) | LAN-WDM (4λ multiplexing) |
| IEEE Standard | IEEE 802.3bm | CWDM4 MSA | IEEE 802.3bm |
| Typical Application | Intra-datacenter (ToR, Spine-Leaf) | Inter-building, Campus | Metro, DCI, Campus |
| Cost Level | ★☆☆ (Lowest) | ★★☆ (Medium) | ★★★ (Higher) |
Note: All specifications are based on FB-LINK 100G QSFP28 transceiver product line. For detailed datasheets, please contact our sales team.
Best For: Intra-rack connections, short-distance server-to-switch links, leaf-to-spine uplinks within data centers.
Best For: Inter-building connections, campus networks, data center interconnect (DCI) up to 2km.
Best For: Metro DCI, long-distance campus backbone, telecommunications infrastructure, 5G fronthaul/backhaul.
Enterprise Profile
FB-LINK functions as an advanced technology corporation specializing in optical fiber communication product innovation, manufacturing, distribution, and technical assistance.
Extensive Industry Knowledge
The founding members collectively possess distinct competencies and specialized expertise, accumulating over 10 years of professional experience across product engineering, innovation development, and commercial marketing domains.
Rigorous Supplier Selection
Partnering with internationally recognized premier chip and component manufacturers including Qualcomm, Broadcom, Semtech, TI, MURATA, SAMSUNG, YAGEO, Sumitomo, and others.
Superior Quality Standards
Maintaining CE, ROHS, FCC, ISO9000, and additional certifications alongside numerous intellectual property patent validations.
At the heart of every optical transceiver lies the photoelectric conversion assembly, responsible for signal transformation between optical and electrical domains. This critical functionality is achieved through three primary component types: TOSA (Transmitter Optical Sub-Assembly) for optical transmission, ROSA (Receiver Optical Sub-Assembly) for optical reception, and BOSA (Bi-directional Optical Sub-Assembly), which integrates both transmission and reception capabilities via coaxial coupling technology. The predominant technical challenges in optical transceiver development center on two crucial areas: optical chip fabrication and advanced packaging methodologies.
Production Workflow for Optical Modules
The manufacturing sequence for optical modules encompasses several essential stages, including Die attachment or Die bonding operations, Wire-Bonding processes, optical coupling alignment, encapsulation procedures, soldering connections, and rigorous burn-in testing protocols.
Optical transceivers are categorized into single-mode and multi-mode variants based on fiber optic specifications. These classifications exhibit significant differences in their internal optical coupling mechanisms. Multi-mode fiber (MMF) typically features core diameters of 50/125μm or 62.5/125μm configurations. These systems frequently employ Vertical-Cavity Surface-Emitting Laser (VCSEL) technology, utilizing reflector-based coupling into the multi-mode fiber infrastructure. This architecture offers straightforward optical pathways, generous alignment tolerances, and simplified manufacturing procedures. Conversely, single-mode fiber (SMF) incorporates a considerably smaller core diameter, typically measuring 9μm, necessitating more sophisticated coupling approaches that require precision lens systems for focused beam coupling.
100G Optical Transceiver Package Variants
Encapsulation techniques fall into two primary categories: hermetically sealed and non-hermetically sealed designs. Hermetic packaging encompasses To-can assemblies, BOX (enclosed) configurations, and butterfly-style packages. These formats are predominantly deployed in telecommunications infrastructure and DCI (Data Center Interconnect) applications requiring long-haul transmission, where demanding environmental conditions and stringent reliability standards prevail. Non-hermetic approaches primarily utilize COB (Chip-on-Board) packaging methodology, which finds extensive application in data center optical transceiver modules.
When identifying the appropriate 100G optical transceiver, module compatibility represents the foremost consideration. Not all 100Gbps optical transceivers function identically, and to avoid any compatibility challenges, verification that your selected optical module integrates seamlessly with current hardware, switching equipment, and cabling infrastructure becomes essential.
To address compatibility concerns, consultation with your hardware provider or engagement with a qualified optical transceiver supplier proves advisable. They deliver expert guidance to resolve compatibility challenges associated with optical transceivers.
Energy optimization constitutes a vital consideration in contemporary data center management. Data centers demonstrate substantial power consumption, generating elevated operational expenses while intensifying environmental consequences. Consequently, selecting 100GbE optical transceivers featuring reduced power requirements effectively decreases operational costs.
Various optical transceiver categories present different power demands. Implementing low-power optical transceivers assists in diminishing utility expenses while advancing environmentally responsible and sustainable operational frameworks. Therefore, during optical transceiver selection, thorough comparison of power consumption parameters ensures alignment between chosen transceivers and your data center's energy optimization objectives.
Maximizing space utilization within data center facilities proves essential for enhancing cost effectiveness and guaranteeing future expansion capability. Through higher density 100Gb/s optical transceivers, optimal utilization of rack capacity becomes achievable. Selecting optical transceivers accommodating increased port quantities per rack unit enables data center capacity maximization without costly infrastructure expansion.
Furthermore, high-density optical transceivers frequently incorporate sophisticated features including hot-swappable module technology. These functionalities reduce downtime during maintenance procedures or system upgrades, consequently decreasing operational expenses while enhancing overall data center dependability.
During 100G optical transceiver selection, assessing total cost of ownership (TCO) becomes imperative. Numerous data center administrators frequently concentrate exclusively on initial acquisition pricing, though this approach may prove inadequate. Actually, optical transceiver performance and dependability substantially influence long-term operational expenditures.
When computing TCO, ensure consideration of elements including maintenance requirements, warranty provisions, and technical support services. An apparently economical optical transceiver may become costly through frequent replacement needs or unexpected downtime occurrences. Therefore, investing in optical transceivers demonstrating established performance records enables time savings and cost reduction associated with outages and repair procedures, constituting efficient resource allocation.
The central component within optical transceivers comprises the optical transceiver device executing photoelectric signal transformation, primarily encompassing the optical transmission device TOSA, optical reception device ROSA, and the optical transmission-reception device BOSA integrating elements like TOSA and ROSA through coaxial coupling mechanisms. Current technical challenges for optical transceivers predominantly concentrate in optical chip technology and optical transceiver packaging methodologies.
Optical Module Manufacturing Procedure
The essential stages of optical module manufacturing methodology primarily incorporate Die attachment or Die bonding, Wire-Bonding, optical coupling, packaging, soldering, burn-in testing, and related processes.
Based on optical fiber distinctions, optical modules separate into single-mode and multi-mode categories. The optical coupling mechanisms within these optical module types differ considerably. Multimode optical fiber (MMF) core diameter typically measures 50/125μm or 62.5/125μm. Surface-emitting laser VCSEL technology commonly applies, coupling into multimode optical fiber via reflector components. The optical pathway remains straightforward, tolerance margins prove substantial, and manufacturing proves relatively uncomplicated. Conversely, single-mode fiber (SMF) core diameter remains smaller than multimode fiber, typically measuring 9 μm, with coupling proving more complex and requiring lens components for focused coupling operations.
The 100G QSFP28 SR4 transceiver utilizes parallel multimode transmission technology, transmitting data across four separate 850nm VCSEL (Vertical-Cavity Surface-Emitting Laser) channels simultaneously. Each channel operates at 25.78Gbps, achieving a combined throughput of 103.125Gbps. This module requires 8 fibers (4 for transmit, 4 for receive) connected via an MTP/MPO-12 interface.
The use of VCSEL technology provides significant advantages in terms of manufacturing cost and power consumption, making SR4 the most economical choice for short-range data center applications. FB-LINK's 100G SR4 modules deliver reliable performance with transmit power ranging from -8.4 to 2.4 dBm and receiver sensitivity of -10.3 dBm.
The 100G QSFP28 CWDM4 transceiver employs Coarse Wavelength Division Multiplexing (CWDM) technology, combining four distinct wavelengths (1271nm, 1291nm, 1311nm, and 1331nm) onto a single pair of single-mode fibers. This innovative approach reduces fiber requirements from 8 strands to just 2, significantly lowering infrastructure costs while extending transmission distance to 2km.
The integrated MUX/DEMUX components within FB-LINK's CWDM4 modules handle wavelength combining and separation, eliminating the need for external multiplexing equipment. With transmit power from -1.4 to 4.5 dBm and receiver sensitivity of -6.5 dBm, these modules provide optimal performance for medium-distance applications.
The 100G QSFP28 LR4 transceiver utilizes LAN-WDM (Local Area Network Wavelength Division Multiplexing) technology with four closely-spaced wavelengths in the 1295-1310nm range. This denser wavelength spacing compared to CWDM4 allows for more precise optical signal transmission over longer distances up to 10km.
FB-LINK's LR4 modules incorporate 4× LAN-WDM EML (Electro-Absorption Modulated Laser) transmitters, providing superior modulation characteristics for extended reach applications. The transmit power range of -4.3 to 4.5 dBm combined with -10.6 dBm receiver sensitivity ensures reliable 10km transmission over standard G.652 single-mode fiber.
| Application Scenario | Recommended Module | Why This Choice |
|---|---|---|
| Data Center ToR-to-Spine | 100G QSFP28 SR4 | Short distance (<100m), cost-effective, high-density MTP/MPO connections |
| Server-to-Switch Connections | 100G QSFP28 SR4 | Rack-level connections typically under 10m, lowest cost per port |
| Inter-Building Campus Links | 100G QSFP28 CWDM4 | 500m-2km range, duplex LC for simplified cabling, balanced cost |
| Data Hall Interconnection | 100G QSFP28 CWDM4 | Adjacent building connections, 2-fiber design saves infrastructure costs |
| Metro Data Center Interconnect | 100G QSFP28 LR4 | Up to 10km reach for geographically distributed data centers |
| Enterprise Campus Backbone | 100G QSFP28 LR4 | Long-distance connections between campus buildings, carrier-grade reliability |
| 5G Fronthaul/Backhaul | 100G QSFP28 LR4 | Telecom-grade performance, extended reach for cell site connectivity |
| Cloud Service Provider Infrastructure | SR4 / CWDM4 / LR4 |
Mixed deployment based on specific distance requirements per link |
100G Optical Transceivers in Various Package Formats
Packaging approaches typically divide into hermetic packaging and non-hermetic packaging categories. Primary hermetic packaging methods encompass To-can, BOX (enclosure), and butterfly packaging configurations. These predominantly serve telecommunications markets or DCI market applications (data center long-distance transmission) where operational environments prove complex and high reliability demands exist. Non-hermetic packaging primarily utilizes COB (chip on board) packaging methodology, extensively deployed in data center optical module applications.
Q: What is the difference between SR4, LR4, and CWDM4?
A: The primary differences lie in transmission distance, fiber type, and wavelength technology. SR4 uses 850nm VCSEL over multimode fiber for up to 100m. CWDM4 uses four CWDM wavelengths (1271-1331nm) over single-mode fiber for up to 2km. LR4 uses LAN-WDM wavelengths (1295-1310nm) over single-mode fiber for up to 10km. All three deliver the same 100Gbps data rate.
Q: Can I use SR4 and LR4 transceivers together?
A: No, SR4 and LR4 transceivers are not interoperable. SR4 requires multimode fiber with MTP/MPO connectors, while LR4 requires single-mode fiber with duplex LC connectors. The fiber types and connector interfaces are incompatible. You must use matching transceivers on both ends of your link.
Q: Which 100G QSFP28 module is most cost-effective?
A: For short-range applications under 100m, 100G QSFP28 SR4 offers the lowest cost per port. For medium-distance (100m-2km), CWDM4 provides good value by reducing fiber count to 2 strands. For 10km reach requirements, LR4 is the only option, though it comes at a higher price point.
Q: What cables are required for each module type?
A: 100G SR4 requires MTP/MPO-12 patch cables with OM3 or OM4 multimode fiber (8 active fibers). CWDM4 and LR4 both use duplex LC patch cables with OS2 single-mode fiber (2 fibers). Make sure to match the fiber grade to your distance requirements.
Q: Are FB-LINK 100G QSFP28 transceivers compatible with Cisco/Arista/Juniper switches?
A: Yes, FB-LINK 100G QSFP28 transceivers are designed with MSA (Multi-Source Agreement) compliance, ensuring broad compatibility with major network equipment vendors including Cisco, Arista, Juniper, HP, Dell, Huawei, and others. We can also provide custom-coded modules for specific switch compatibility upon request.
Q: What is the power consumption difference between SR4, CWDM4, and LR4?
A: Typical power consumption: SR4 (~2.5W) < CWDM4 (~3.0W) < LR4 (~3.5W). SR4 uses efficient VCSEL technology resulting in lowest power consumption. LR4 requires more power for its EML laser transmitters and longer-reach amplification.
Q: Can CWDM4 and LR4 modules work on the same fiber infrastructure?
A: Yes, both CWDM4 and LR4 modules use standard OS2 single-mode fiber with duplex LC connectors. If your fiber infrastructure supports the longer 10km distance of LR4, it will also support CWDM4 for shorter links. This provides flexibility for mixed deployments.
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