Bookham announces 5-Gbit/sec DWDM SFP

The transceiver, which Bookham believes to be the fastest DWDM SFP module available, is designed to operate in high-noise, amplified environments and is targeted at multi-span links for metro networks. The module can deliver output power from +3 dBm to +6 dBm, has channel spacing of 100-GHz, and offers full C- and L-band coverage. Bookham says it has also achieved an uncompensated reach of 400 km at 2.5 Gbits/sec with a multi-rate DWDM SFP, continuing the evolution of the company's high-performance pluggable product range. The portfolio offers DWDM options for all transmission speeds and network protocols, including Ethernet, Fiber Channel, and SONET/SDH. All designs are underpinned by the same proven optical engines, says the company, including the Bookham Avalanche Photodiode (APD) receiver and buried-heterostructure directly-modulated laser. "We are continually developing the performance of our pluggable modules to retain our leading technology position in the pluggable WDM sector and meet the breadth of demands from our customer base," reports vice president of telecom sales Yves Le Maitre. "Boasting the highest speed and the longest reach in SFP WDM pluggable optics, coupled with outstanding stability and tolerance to low OSNR links, is a great achievement for the design team. We are confident that we can continue to grow our market share in this highly competitive space." In addition to these transceivers, the Bookham WDM SFP portfolio offers standard optical power devices in both multi-protocol (SONET, Ethernet, and 4-Gbit/sec Fiber Channel) and multi-rate (100-Mbit/sec to 2.7-Gbit/sec) variants as well as equivalent versions with higher optical power levels (5.5 dBm typical). All these parts are available in C- and L-band wavelengths. For 4-Gbit/sec Fiber Channel applications, Bookham says it has specific DWDM and CWDM parts targeted at 80-km point-to-point links. According to company representatives, this wide range ensures that Bookham is able to meet the demands of customers operating all WDM systems based on pluggable optics.

SFP optical module diagnostic functions application

Use of intelligent optical modules, network management unit can be real-time monitoring of transceiver module temperature, supply voltage, laser bias current, as well as transmit and receive optical power.The measurement of these parameters, you can help manage the unit to identify the location of the fiber link failure, simplify maintenance, improve system reliability.This article describes how to use the optical module of the digital diagnostic functions positioning system failure.
Digital diagnostic functions
SFF-8472 MSA specification digital diagnostic functions and SFF-8472 details.The specification states that the circuit board inside the module detection and digital parameter signal.Then, after calibration or digital measurement results and calibration parameters.This information is stored in the memory structure of the standard, in order to read through the dual-cable serial interface.The SFF-8472 to retain the original SFP / GBIC in the address A0h at the address mapping and address A2h new a 256-byte storage unit.In addition to the parameter detection information, the storage unit defines the warning signs or warning condition, the state of each pin image, limited ability to control the digital and user-written storage unit.
What is part of the information stored in the address space:
1) Real-time measurement parameters
      Emitted light power Tx_power
     Received optical power Rx_power
     Temperature temp
    Operates at Vcc
     Laser bias Laser Bias
2) Alarm or alarm
      Tx_faul
     LOS measurement of the parameters of the alarm and the alarm flag
3) control flag
      Tx_disable
      Rate_select
The application of digital diagnostic functions
Troubleshooting features in the optical transceiver system provides a means of performance testing, system management can help to predict the life of the transceiver module, the failure of the isolation system and to verify the compatibility of the module in the on-site installation.
Module life prediction
This failure to predict that allows network managers to find potential link failure in the system performance affected. Failure notice, the system administrator can business to switch to the backup link or replace a suspicious device, which in the case of non-stop services to repair the system.
Only SFP provides a real-time parameter detection means of the laser degradation of a prediction.The optical module within the optical power feedback control unit will control the output power in a stable level, but with the aging of the laser, the quantum efficiency of the laser will be reduced.The power control is achieved by increasing the laser bias current (Tx_Bias).Therefore, we can predict the life of the laser through the detection of the laser bias current.This method can be a rough estimate of the life of the laser near the end.Temp and Vcc, laser bias current and module temperature and voltage have a relationship, so the need to consider when setting the bias current limit.
By real-time monitoring of transceiver module within the operating voltage and temperature, allowing the system administrator to find some potential problems:
1) the Vcc voltage is too high, will bring the breakdown of the CMOS device; the Vcc voltage is too low, the laser is not working properly.
2) accept the power is too high, can damage the receiver module.
3) The operating temperature is too high, will accelerate the aging of the device.
In addition, the received optical power monitoring, and can monitor the performance of the lines and the remote transmitter.
Fault location
In the optical link, locate the fault, an unknown critical to business fast loading. The fault isolation feature allows system administrators to quickly locate the position of a link failure. This feature can locate the fault line in the module; local modules or remote modules. By quickly locate the fault, reducing the repair time of system failure.
Fault status, a comprehensive analysis of the status bits, pins and measurement parameters.
In short, digital diagnostic functions, you can locate the fault.Fault location on Tx_power Rx_power, Temp, and Vcc, Tx_Bias, warning and alarm status of a comprehensive analysis.State variables in the memory mirroring Tx Fault and Rx LOS (loss of signal) on the failure analysis plays an important role.
Verified for compatibility
Another feature of digital diagnostic module compatibility verification. Compatibility verification is the analysis module of the working environment in line with the Data Sheet and the relevant standard compatible. Module performance can be ensured only in the work environment that is compatible. In some cases, due to environmental parameters beyond the data sheet or the relevant standards, will cause the module performance degradation, and thus transmission error.
Working environment and the modules are not compatible:
1) the voltage beyond the specified scope
2) the received optical power overload or below the receiver sensitivity
3) the temperature exceeds the operating temperature range

Gigabit fiber GBIC SFP technical specifications details

1 What is GBIC?
GBIC stands for Giga Bitrate Interface Converter is a gigabit electrical signal is converted to optical signal of the interface device. The GBIC design for hot swap. GBIC is interchangeable products meet international standards. Gigabit switch with GBIC interface design interchangeable flexible to account for a large market share in the market.
2 What is SFP?
SFP is an abbreviation of the SMALL FORM PLUGGABLE, can be simply understood as the upgrade version of GBIC.SFP module volume ratio of the GBIC module is reduced by half, more than double the number of ports can be configured in the same panel. Other features of the SFP modules and GBIC. Some switch vendors said the SFP module miniaturization-GBIC (MINI-GBICs). SFP module volume ratio of the GBIC module is reduced by half, more than double the number of ports can be configured in the same panel. Other features of the SFP modules and GBIC.
3 fiber in which several?
Fiber into a multimode fiber and singlemode fiber in two ways: multi-mode fiber light-emitting device is relatively cheap and the construction of simple features, widely used in short distance communication, multi-mode fiber is divided into 50um core diameter and 62.5umcore diameter of two types, which 62.5um more common, but the performance of 50um. The company GBIC-SX multi-mode products are suitable for both multi-mode fiber transmission distance of 550 m, (50um optical fiber) and 330 m (in 62.5um fiber).
Single-mode fiber is generally used for long-distance communication core diameter 9um, my single-mode GBIC products in single-mode fiber transmission distance of 10 km, 20 km, 70 km, 120 km. General switch vendors in single-mode, only 10 km and 70 km in two models, the 20 km product can effectively save a specific network of system integrators, the overall cost of the program. 120 km for long operating environment.
Introduction of Gigabit Interface Converter (GBIC)http://www.10gsfp.com/
Gigabit Interface Converter (GBIC) is a hot-swappable input / output devices, the device is plugged into Gigabit Ethernet port / slot, and is responsible for the port with the fiber-optic network to connect together. GBIC can be used in a variety of Cisco products (see Table 2) and interchangeable, and can mix and follow the IEEE 802.3z 1000BaseSX, 1000BaseLX/LH, or 1000BaseZX interfaces per-port basis. Furthermore, Cisco is providing a full compliance with the standard IEEE 802.3z 1000BaseLX 1000BaseLX/LH interface, but in single-mode fiber transmission distance of up to 10 kilometers far 5 km than the average 1000BaseLX interfaces. In short, with the continuous development of new features, these modules to upgrade to the latest interface technology will be easier, so that customers' investments to achieve maximum efficiency.

Bookham launches XFP-E tunable pluggable transceiver /XFP Module Group debuts completed spec for public review

SEPTEMBER 18, 2008 -- Bookham Inc. (search for Bookham) has announced the launch of a high-performance full-band tunable pluggable transceiver in the XFP-E format. The product, the TL8500, is targeted at long-haul links and metro/regional networks at rates up to 11.3 Gbits/sec.

The XFP-E format is an industry recognised MSA, and by adding full-band tunability Bookham says it can now offer customers a "universal" 10-Gbit/sec transceiver with the following qualities:


    density: maximum faceplate density for all links, including high performance long haul
    flexibility: for "pay as you grow" capability and in-service accessibility
    reliability: using field-proven technology
    security: MSA format for ease of procurement
    economy: highly competitive compared to alternative technologies and formats.


The module is underpinned by the fully Telcordia qualified Bookham indium phosphide Mach Zehnder (InP MZ) modulator and DSDBR laser -- the key building blocks of the Bookham range of high performance tunable modules.

"We have already established a clear commercial lead in tunable pluggable devices with the success of our TL8000, and delivering high-end 300-pin capability in the XFP-E format extends that leadership. We are showing that there is a real market for tunable pluggables in a variety of formats," said Bookham Director Product Management Adam Price.

"With our proven, high-performance optical components and decade of field history with indium phosphide Mach Zehnders, we are perfectly placed to expand the current tunable pluggable portfolio to include a variety of tunable formats, including X2, XENPAK, and XFP," he added.


16 January 2003 -- The 10 Gigabit Small Form-factor Pluggable (XFP) Module Group, a module multi-source agreement (MSA) association, has announced that the XFP specification is available for final public review.

The specification is intended to help speed development of multi-sourced, application-transparent, ultra-small-form-factor 10Gbit/s modules, which are designed to occupy one-fifth the space and use one-half the power of current modules. The specification is complete and available on the web at www.xfpmsa.org. It is scheduled for final adoption in February. Instructions are provided for transmitting public review comments to the XFP Group.

"Since its inception, the XFP MSA has grown to over 80 companies, illustrating the growing interest in accelerating the development of 10Gbit/s Fibre Channel, Ethernet, SONET, and related 10Gbit/s technology to market," says said Bob Snively, principal engineer at Brocade and chairman of the group. "XFP products compliant with this specification are being shipped by several companies."

Modules built to the XFP specification feature an electrical interface called XFI, which removes the complexity and power associated with placing electrical transceivers inside other available modules. This results in significant space, power and cost savings to module suppliers and system manufacturers.

The small size of XFP modules will enable the development of boards having up to 16 10Gbit/s ports to be deployed in a 19-inch rack space, and their cost structure will help accelerate the deployment of inexpensive 10Gbit/s client interfaces. Additional cost benefits can be achieved as higher levels of circuit integration become available at the 10Gbit/s data rate. Because the XFP specification is not protocol dependent, multiple market segments will benefit from the aggregate volume of XFP modules.