Overview of 25G DWDM SFP28 Modules
Our 25G DWDM SFP28 modules represent the pinnacle of fiber optic network capacity and efficiency. Specifically, they utilize Dense Wavelength Division Multiplexing (DWDM) technology. This technology uses tightly spaced channels, typically within the C-band, to transmit dozens of 25Gbps data streams over a single fiber pair. As a result, these transceivers enable an unprecedented level of data aggregation. They are, therefore, the ideal solution for overcoming fiber exhaustion in high-bandwidth environments like data centers and service provider networks.
Furthermore, this category features modules engineered for long-haul transmission, with standard options reaching 80km and beyond. In contrast to CWDM, which is suited for shorter-range, lower-channel-count applications, DWDM is built for maximum scalability and distance. Consequently, every module complies with MSA standards, guaranteeing plug-and-play compatibility with a wide array of networking equipment.
Key Features
- Massive Channel Capacity: First and foremost, leverage the 100GHz DWDM grid to combine 40, 48, or even more 25G channels onto a single fiber. This provides multi-terabit capacity.
- Extended Long-Haul Reach: Additionally, select from modules designed for distances of 10km, 40km, and up to 80km. With optical amplification, these links can be extended even further.
- C-Band Wavelength Operation: In fact, these modules operate in the C-Band (1525nm to 1565nm). This spectrum is ideal for long-haul transmission because it has the lowest signal loss and works perfectly with EDFA amplifiers.
- Fixed and Tunable Options: Choose from cost-effective fixed-channel modules or highly flexible tunable SFP28 transceivers. Tunable modules can be configured to any channel on the DWDM grid, which simplifies inventory management.
- High-Performance APD Receiver: For long-distance links, these modules utilize a high-sensitivity Avalanche Photodiode (APD) receiver. This is essential for detecting the weakened optical signal after it has traveled many kilometers.
- Digital Diagnostics Monitoring (DDM/DOM): Lastly, all modules support real-time monitoring of critical parameters like transmit/receive power, temperature, and voltage.
Applications
Indeed, the extreme density and reach of our 25G DWDM SFP28 transceivers make them essential for the most demanding network applications:
- Data Center Interconnect (DCI): For example, they are used to build massive-capacity links connecting multiple data centers across a region.
- Metro and Regional Core Networks: Likewise, service providers use them to scale their core network infrastructure without laying new fiber.
- 5G Backhaul and Midhaul: Another key use is aggregating high volumes of traffic from multiple 5G cell sites back to a central office.
- High-Capacity Enterprise Links: They can also connect geographically separate enterprise campuses with a robust and scalable optical backbone.
Specifications
| Parameter | Value |
|---|---|
| Form Factor | SFP28 (Small Form-factor Pluggable 28) |
| Max Data Rate | 25.78 Gbps |
| Technology | Dense Wavelength Division Multiplexing (DWDM) |
| Wavelength Range | C-Band, 100GHz ITU Grid (e.g., C17-C61) |
| Max Distance | Up to 80km (Amplified links can be longer) |
| Connector | Duplex LC Connector |
| Receiver Type | PIN (for ≤10km), APD (for >10km) |
| Compliance | SFF-8402, SFF-8431, SFF-8432, SFF-8472 |
Building a DWDM System
A successful 25G DWDM network requires more than just transceivers. First, a DWDM MUX/DEMUX is needed to combine and separate the different wavelengths. For links longer than 30-40km, other components become critical. For instance, an Erbium-Doped Fiber Amplifier (EDFA) is used to boost the optical signal. Additionally, a Dispersion Compensation Module (DCM) may be required to correct signal degradation over very long fiber spans. Ultimately, planning these components together ensures a stable, high-performance link.
FAQ (Technical & product category Questions)
1. What is 25G DWDM SFP28?
A 25G DWDM SFP28 is a compact, hot-pluggable optical transceiver. It transmits 25Gbps of data over a very specific wavelength (channel) of light. By using many modules on different channels, you can multiply a single fiber’s capacity by 40 times or more. This makes it an incredibly efficient technology.
2. What is the main advantage of DWDM over CWDM?
The primary advantage is channel density. For instance, DWDM uses much narrower spacing between channels. This allows for 40, 80, or even 96 channels, whereas CWDM typically supports a maximum of 18. Consequently, DWDM provides far greater scalability for high-capacity networks.
3. What is a “tunable” DWDM SFP28 module?
A tunable DWDM SFP28 module is a highly advanced transceiver. Unlike a fixed-channel module, its wavelength can be reconfigured via software. This allows a single part to be used for any channel in the DWDM grid. Therefore, it dramatically simplifies spare parts inventory and network provisioning.
4. Do I need an amplifier (EDFA) for my 80km DWDM link?
In most cases, yes. An 80km 25G DWDM SFP28 module has a high power budget. However, it is designed to work within a full DWDM system. That system almost always includes an EDFA to boost the signal and overcome losses from the MUX/DEMUX and the long fiber span. In short, amplifiers ensure link stability.
5. What is the ITU 100GHz Grid?
The ITU 100GHz Grid is an international standard that defines the exact frequencies (or wavelengths) for DWDM channels. It spaces each channel 100GHz (~0.8nm) apart to prevent interference. All standard DWDM equipment, including our modules and MUX units, adheres to this grid for interoperability.
6. Is Forward Error Correction (FEC) necessary for 25G DWDM?
Absolutely. Host devices (switches, routers) must have FEC, specifically RS-FEC, enabled. In fact, FEC is critical for correcting the small number of bit errors that naturally occur on high-speed, long-distance links. Without FEC, a 25G link over 10km would likely be unstable and unreliable.
7. Can I connect a DWDM module directly to a standard grey optic?
No, you cannot. A DWDM module transmits on a specific, colored wavelength within the C-band. A standard (grey) optic transmits on a wide-band wavelength like 1310nm. They must be connected to a DWDM MUX/DEMUX system or another identical DWDM module on the same channel to communicate.
8. Are these modules compatible with my existing network equipment?
Yes. Our 25G DWDM SFP28 modules are built to MSA (Multi-Source Agreement) specifications. Furthermore, they are programmed to be compatible with equipment from all major network vendors, including Cisco, Arista, Juniper, and many others, ensuring seamless integration.