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Fiber Optic Connectorized Components(光纤连接设备)


Application Note
Fiber Optic Connectorized Components
ABSTRACT Honeywell Optoelectronics is a leader in the 850 nanometer Fiber Optic Component market providing LEDs, integrated transmitters, photodiodes, integrated receivers, modules, and modems. This presentation is intended to acquaint the designer of fiber optic equipment with the capabilities of Honeywell Optoelectronics. INTRODUCTION Honeywell Optoelectronics provides a full line of 850 nanometer fiber optic transmitters and receivers. These products are offered assembled in fiber optic connectors, or they can be bought as individual base components. Honeywell Optoelectronics Fiber Optic group has organized a selection guide to make it easy for you to find the optimum fiber optic products for your design. The selection guide addresses six main topics and is divided accordingly. 1. 2. 3. 4. 5. 6. Part Number Guide Connectorized Components Modules Modems Base Components General Information The dash number which specifies the power out can be found on page 7 of the Selection Guide. WHY BUY CONNECTORIZED PRODUCTS? Fiber optic components from Honeywell can be purchased either connectorized or as base transmitter or receiver components. In order to properly use base components the devices must be mounted in a fiber optic connector. The most popular and preferred style of fiber optic connectors are the ST? or SMA style. Honeywell offers the widest variety of devices mounted in the ST? and SMA styles of fiber optic connectors. When Honeywell assembles its base components in fiber optic connectors, it ensures proper alignment as well as power and sensitivity to meet the required specifications. All connectorized devices are tested and inspected to ensure the highest quality products available in the industry. When the user assembles base fiber optic components in fiber optic connectors, the total distribution bought will not meet the final system requirements, and final testing of the product may not be performed. When designing non-standard connectors with low volumes, the system designer may be required to mount the base components in the connector. When high volumes are required, Honeywell will work to provide connectorized products to the system designers. TRANSMITTER/LED ALIGNMENT The main purpose of a fiber optic transmitter/LED is to launch optical power into a fiber optic cable. In order to perform this properly, both the fiber optic cable and active transmitter/LED, must be connected together. The most widely accepted standard styles of fiber optic connectors currently are the SMA (905 or 906) and the ST?. The FDDI style connector is gaining acceptance in the LAN marketplace and its usage should increase in the future. A fiber optic cable will accept optical power directly into the cable up to an angle specified by the numerical aperture (NA) of the cable (see figure 1). The core of the cable is the area where the optical power travels striking the smallest amount of impurities, thus reducing the loss in the cable. The core has the lowest amount of loss of optical power per kilometer and is specified in dB/km. A cable with a core loss of 3 dB/km will lose half the optical power (3 dBm) for every kilometer that the optical power travels. The alignment of the fiber optic cable to the center of the active transmitter is a major consideration when launching optical power into a fiber optic cable. The SMA style connector allows the connector on the fiber cable to rotate in the connector which contains the active fiber optic component. The ST? and FDDI style connectors have positive aligning, thus minimizing the rotation problem. Figure 2 shows an example of the differences between the ST? and SMA component connector styles.
Honeywell reserves the right to make changes in order to improve design and supply the best products possible.

This discussion will cover the Part Number Guide, Connectorized Components, and Base Components sections. PART NUMBER GUIDE The first section of the Part Number Guide consists of connectorized receiver/detector components and base receiver/detector components. The connectorized components consist of a base component inserted and aligned in an active fiber optic connector. In all cases, the specifications for the base component are met for the connectorized components. The second section consists of connectorized transmitter/LED components, base transmitter/LED components, modules and modems. The connectorized components consist of a base component inserted and aligned in an active fiber optic connector. In all cases, the specifications for the base component are met for the connectorized component. In some instances, the connectorized component has better power specifications than the base component. The reason for this will be discussed later. We will not discuss modules and modems in this session. The third section is a cross reference table that helps to identify the component part number for each connectorized component. The base component and connector are on the axes. Example: when the HFE4020 is mounted in an ST?-style low profile (ST?-LP) connector, the final assembly becomes the HFE4834.
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? Honeywell Europe S.A.

Application Note
Fiber Optic Connectorized Components
Figure 1 Fiber Optic Cable When inserting an active fiber optic component into a fiber optic connector, the amount of power that can be launched into a cable can be dramatically changed by the alignment of the light from the transmitter/LED to the end of the fiber optic cable (see figure 3). The active spot of light is more intense in the center of the component (see figure 4) and any misalignment can drastically change the amount of light accepted by the cable. By aligning the transmitter/LED intensity to give the required power launched into a centered fiber optic cable, the user will have a product that is best matched for general usage. Light intensity is reduced by the square of the distance from the source. Therefore, it is very important to minimize any air gap between the fiber optic transmitter and the end of a fiber optic cable. The process for assembly and alignment of transmitters/LEDs and epoxying them into a fiber optic connector is more difficult than most users realize. The base component must be aligned and set in the proper position then epoxied and cured without misalignment. Honeywell Optoelectronics will economically perform this operation for you, thus allowing you to concentrate on the design work for your equipment. All products are tested in their final configuration for the required optical and electrical specifications before the parts are shipped. Figure 3a Properly Aligned Devices
PLASTIC

CLADDING CORE C L

JACKET

?

NA = SIN ?

Figure 2a ST? Connector - Alignment Notch on Connector

FIBER OPTIC CABLE

METAL

Figure 2b SMA Connector - No Alignment Notch on Connector

FIBER OPTIC CABLE

Figure 3b Misaligned Devices (2 Degrees)
PLASTIC

FIBER OPTIC CABLE

2 DEGREES MISALIGNMENT

METAL

FIBER OPTIC CABLE

Honeywell reserves the right to make changes in order to improve design and supply the best products possible.

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Application Note
Fiber Optic Connectorized Components
ST? AND SMA STYLE CONNECTORS ST? and SMA connectorized components can be located in the Honeywell Fiber Optic Data Book and Selection Guide. The new ST? version of the Honeywell Fiber-DIP product and the SMA version can be found in the Fiber-DIP section of the Honeywell Fiber Optic Data Book or Selection Guide. The optical specifications are better for these devices than for the base components. This is due to the ability of Honeywell to actively align both the transmitter/LED and receiver/detector components. Figure 4 Active Spot Intensity
WINDOW

CONCLUSION Honeywell Optoelectronics is one of the world’s leading designers and manufacturers of fiber optic data communication components. Honeywell Optoelectronics provides the industry with the finest and highest quality 850 nanometer LEDs, integrated transmitters, photodiodes, and integrated receivers connectorized as well as base components. With our proven track record, and the experience of the over 100 year old, multinational Honeywell corporation you can rest assured we’ll be there when you need us. Now, and in the future.

Note: ST is a registered trademark of AT & T.

LIGHT SPOT

METAL PACKAGE BASE COMPONENT

PLASTIC PACKAGE BASE COMPONENT

RELATIVE RADIANT EMITTANCE

100 90 80 70 60 50 40 30 20 10 0 250 200 150 100 50 0 50 100 150 200 250 RADIAL DISTANCE FROM OPTICAL AXIS (MICRONS)

The power supply voltage for digital integrated transmitters is 5 V +10%. At the present time the optical and electrical specifications are the same for these connectorized and base components. For optical and electrical specifications of other connectorized versions refer to the base component information.

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Honeywell reserves the right to make changes in order to improve design and supply the best products possible.

Honeywell reserves the right to make changes in order to improve design and supply the best products possible.

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