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QSFP+ PSM4 Active Optical Cables Tutorial

  • QSFP+ PSM4 Active Optical Cables Tutorial Fiber-Mart.com
  • Post on Wednesday 04 March, 2015
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Introduction of QSFP+ PSM4 Active Optical Cables

 

Industry-leading PSM4 (Parallel Single Mode Quad) Active Optical Cables (AOCs) achieve 40 to 56 Gbps data rates over long reaches up to 4 km, using a fraction of the power of other brands while providing streamlined installation for high-performance computing and storage applications.

The PSM4 AOCs use a Silicon Photonics (SiPh) optical engine and use lower cost singlemode fiber for transmission distances up to 4km. Pigtail versions (one end is a standard MTP/MPO connector) allow for easy plug-in to structured cabling, thus avoiding the need to pull the AOC through long distances of cable duct work. The low-power PSM4 AOC integrated cable solutions provide less expensive, reliable transport for aggregated data rates (from 40 to 56 Gbps) across much longer distances (4km) than VCSEL based AOCs.

QSFP+ PSM4 AOCs offer significant cost advantages over traditional optical transceiver modules and can easily be substituted by interfacing to systems via a standard QSFP+ MSA connector. The cables are electrically compliant with the QSFP+ interface InfiniBand FDR/DDR/QDR (Fourteen Date Rate / Double Date Rate / Quad Date Rate), Ethernet (10 and 40 Gbps), Fibre Channel (8 and 10 Gbps), SAS 3.0 and 2.1 (12 and 6 Gbps) and other protocol applications.

There are mainly three types of QSFP+ PSM4 AOCs shown as below:

QSFP+ FDR PSM4 AOC

QSFP+ 56 Gbps FDR PSM4 AOC
Fiber-Mart QSFP+ QDR PSM4 AOC

QSFP+ to QSFP+ QDR PSM4 AOC
QSFP+ to MPO QDR PSM4 AOC

QSFP+ to MPO Connector QDR PSM4 AOC

Features & Benefits of QSFP+ PSM4 AOC

 

Low power consumption of less than 0.78W QDR and 1.1W FDR per cable end, 30% less than competition: Improves overall data-center power consumption and thermal efficiency. Enables deployment of additional ports for increased number of AOCs per system, resulting in more connectivity options and total system cost savings. Four bi-directional (BIDI) optical data links per end, operating at data rates from 1.0 to 14.0 (aggregated 56.0) Gbps for FDR versions and 1.0 to 10.3125 (aggregated 40.0) Gbps for QDR versions: Compatible with multiple protocols including InfiniBand Fourteen Data Rate (FDR), 10 Gbps Ethernet, Fibre Channel (8 and 10 Gbps), SAS 2.1 and 3.0 (6 and 12 Gbps) and other protocol applications. Low Bit Error Rate (BER) of 1E-18: Provides increased data reliability and robustness of link versus standard transceivers with 1E-12 errors per link. QSFP+ PSM4 to MPO cables available with loss budgets of 2 and 4dB, enabling links up to 4km: Supports use in structured cabling systems. Lower cost option versus standard transceivers and cable assemblies: Allows for significantly more structured, economical cable links. Low-loss singlemode pigtail versions available: Ensures network is capable of handling future bandwidth increases. Minimizes future highcost cable upgrades as bandwidth requirements increase. QSFP+ PSM4 to QSFP+ PSM4 AOC cables are permanently attached to the fiber, with no air gaps: Interface provides protection from environmental contaminants and other user disturbances during installation. Firmware is field flashable via an I2C bus: Ensures cables can be re-flashed while in the host system.

Advantages of Siph-based PSM4 Solution for 4-km Reach

 

Multiple forces are driving the implementation of PSM4 and SiPh in next generation data-center designs and architectures. PSM4 and SiPh fill an important gap in data-center interconnect options, the gap between the reach of 25G multimode options and that of Long Range (LR) optical approaches. Using pigtail designs with these technologies can ease implementation via easy mating to structured cabling. From a futureproofing perspective, PSM4 is an approach that can accommodate both current and future bandwidth upgrades. A SiPh-based PSM4 approach helps resolve the multiple challenges of higher bandwidth, longer distances, low power, and futureproofing. SiPh-based LR PSM4 products offer seven primary advantages.

Distance: With transmission distances up to 4 km, they can accommodate most, if not all, new data-center requirements. Power: SiPh-based AOCs use basically the same power consumption as VCSEL-based products: under 1 W for a 10G QSFP+ AOC and 1.5 W at 25 Gbps. Cost: The cost is roughly the same as VCSEL-based AOCs, but since they are single mode (SM), they use much less expensive SM cable. As speeds increase, VCSEL-based products require ever more expensive types of fiber. After most networks have upgraded to OM3, an upgrade to OM4 can be costly. And what comes after OM4, and how soon will it be needed? With SM SiPh AOCs, the fiber remains inexpensive SM and stays consistent as data rates increase. Futureproof Structured Cabling: Upgrading structured cabling is less economically viable as speeds continue to increase. PSM4 can accommodate 10 GbE, 40 GbE, 4x10 Gbps aggregated QDR Infiniband, 4x14 Gbps FDR Infiniband, 100 GbE, 4x25 Gbps aggregated. Pigtail Plug-in Options for Ease of Installation and Upgrades: PSM4 AOCs are available in pigtail versions. Here, one end is a traditional QSFP+ active interface and the other either MPO or LC connectors. This enables a quick connection to structured cabling (so the AOC side doesn't have to be pulled long distances) and the ability to quickly upgrade as needed with no costly structured cabling upgrade and associated data-center downtime. SiPh Actives Becoming Broadly Available: An ecosystem of proven, reliable, cost-effective SiPh devices exists to accommodate SM data-center links. SiPh is widely deployed today in PSM4 AOCs, and several new entrants into the market are offering a variety of options. SiPh Offers a Path Beyond 25G: VCSELs face increasing challenges as speeds increase. With SiPh-based systems, most modulating schemes have a clear and well-understood technology path to 50G, 100G, and beyond.

SM SiPh bridges the gaps caused by the dual requirements of longer distances and higher data transmission speeds. With a broad base of products both available and being developed by multiple suppliers, PSM4 and SiPh AOCs can be deployed today to enable new data-center architectures, with the assurance that they'll provide a path to cost-effectively meet future upgrade requirements.


Fiber-Mart's 40G QSFP+ AOC Solution

 

Fiber-Mart offers 40GBASE QSFP+ to QSFP+ active optical cables with lengths of 10m to 100m. Lengths and compatible brands can be customized up to customers' requirements.

Fiber-Mart 40G QSFP+ AOC
Specifications of Fiber-Mart's 40G QSFP+ AOCs:


Length: Customized Connector 1: QSFP+ AOC Connector 2: QSFP+ AOC Data Rate: 40GBASE Wire AWG: Fiber Supply Voltage: 3.1 to 3.5V Storage Temperature: -20 to 85℃ Operating Temperature: 0 to 70℃ Humidity (non-condensing): 5% to 95% Compliant to the QSFP+ MSA SFF-8436 RoHS compliant

Applications of Fiber-Mart's 40G QSFP+ AOCs:

InfiniBand QDR (4 x 10G), DDR (4 x 5G) and SDR (4 x 2.5G) interconnects Data Aggregation, Backplane and Proprietary Density Applications PCI-Express, SAS/SATA, Fiber Channel compatible interconnect 40GBE and 10GBE interconnects 40G Telecom connections Hubs, switches, routers, servers Ethernet 10G, 40G SAS, SATA 3G, 6G Myrinet 40G Data Centers


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