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PDF AN649 Data sheet ( Hoja de datos )
| Número de pieza | AN649 | |
| Descripción | HFTA-04.0: Optical/Electrical Conversion in SDH/SONET Fiber Optic Systems | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
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FIBER OPTIC CIRCUITS
Application Note 649: Jun 28, 2000
HFTA-04.0: Optical/Electrical Conversion in SDH/SONET Fiber Optic Systems
This article explains the basic functions and design challenges of the optical to
electrical and electrical to optical signal conversion in SDH/SONET fiber optic
receivers and transmitters. A complete chip set solution to develop the electronic part
of OC 12/STM 4 receivers and transmitters is presented.
The advent of cheaper and more powerful personal computers has not only expanded the user
base; it is also creating a demand for greater transmission capacity among the telecom
networks by adding an increasing volume of internet and videophone connections to the
traditional phone and fax services. The following discussion of an OC 12/STM 4
receiver/transmitter chipset supports these developments and includes a description of the
electronic components required for optic/electric (O/E) conversion in SDH/SONET fiber optic
transmission systems.
Competition among network providers enables the multimedia market to grow, and the
introduction of new and improved products and services in the near future should strengthen
the demand for increased transmission capacity. This need for more data throughput can be
satisfied economically with fiber optic (FO) cables because the transmission capacity is
potentially very high (versus that of copper wires). The physical nature of the fiber cable lets
providers expand capacity by increasing the transmission bit rate or by introducing alternative
transmission techniques, without the need for further upgrades or additional cable installations.
These advantages have led many countries to build extensive fiber networks, and further
expansion of these networks can be expected.
To transmit optical data via fiber cables, signals must be converted from electrical to optical at
the transmit end, and then converted back to electrical at the receive end. These necessary
conversions are handled by receiver/transmitter units that contain electronic devices along with
the optical components.
FO transceivers
The widely used Time Division Multiplex (TDM) transmission technique now enables bit rates
up to 10Gbps and is well established in modern transport systems. Today's high-speed fiber
optic transmission systems offer the following standard bit rates:
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deserializer must also provide a CMOS-compatible interface. To support bit alignment of the
serial data stream to the different deserializer outputs, the deserializer should include bit-
synchronization capability.
Optical transmitter
The optical transmitter in a fiber optic system converts the electrical bit sequence delivered
from the CMOS system components to an optical data stream. As shown in Figure 1, it contains
a serializer with clock synthesizer (which depends on the system setup and transmission bit
rate), a driver, and an optical source.
Two important wavelength ranges (windows 2 and 3) are in use for transmitting information
over a fiber cable in telecommunication networks. Within an optical window, the signals
benefit from a lower impact on quality (less dispersion) and less attenuation per unit of fiber
length. The range between 1000nm and 1300nm, called the second optical window, is known
for low dispersion-as low as 0dB. The range from 1500nm to 1800nm, known as the third
optical window, offers the lowest attenuation per unit of fiber length (Figure 3).
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As an alternative to the 622Mbps MAX3667, the MAX3766 laser driver can be used for STM 4
transmitter units supporting data rates from 155Mbps to 1.25Gbps. Designed to operate on a
single +5V supply, the MAX3766 incorporates all attributes mentioned for the MAX3667 plus
the larger bandwidth (to 1.25Gbps). Other features include extensive laser-safety provisions
and the option to add a single external resistor that maintains "optical amplitude" by
compensating for the effect of temperature on the slope of the characteristic laser curve. The
resistor's value depends on the laser diode's temperature characteristic.
MORE INFORMATION
MAX3664: QuickView -- Full (PDF) Data Sheet (248k)
MAX3667: QuickView -- Full (PDF) Data Sheet (648k) -- Free Sample
MAX3675: QuickView -- Full (PDF) Data Sheet (568k) -- Free Sample
MAX3681: QuickView -- Full (PDF) Data Sheet (64k) -- Free Sample
MAX3691: QuickView -- Full (PDF) Data Sheet (90k) -- Free Sample
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Page 11 of 11
11 Page | ||
| Páginas | Total 11 Páginas | |
| PDF Descargar | [ Datasheet AN649.PDF ] | |
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