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參數(shù)資料
| 型號(hào)： | SRM-155 |
| 廠商： | VECTRON INTERNATIONAL |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | SONET/SDH Fiber-Optic Receiver Module with SAW Filter Clock Recovery and Data Retiming(SONET/SDH 光纖接收模塊(帶SAW濾波器,時(shí)鐘恢復(fù)和數(shù)據(jù)重定時(shí)功能)) |
| 中文描述： | RECEIVER, XFO |
| 封裝： | DIP-20 |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大小： | 184K |
| 代理商： | SRM-155 |
SRM-155 SONET/SDH Receiver Module
Product Data Sheet
VI
603-598-0070
2
Functional Overview
This highly integrated module converts a 155 Mb/s
fiber-optic NRZ signal to differential PECL recovered
clock and retimed data outputs. A CMOS flag alerts the
user to a loss of signal condition when the optical input
falls below an acceptable level.
A single +5 Volt supply provides bias for the module’s
pin-photodiode, preamplifier, Quantizer, and SAW filter
timing recovery circuit. All elements are integrated into
fiber-coupled 1.3” X 0.635” 20 pin DIL package. The
SRM-155 footprint and pinout are industry common for
ease of integration.
The optical signal is coupled through a short length of
SBJ, Type 2, 62.5
μ
m multimode optical fiber to a
hermetic module which encases an InGaAs pin-
photodiode and preamplifier. The pin-photodiode
converts the optical signal to an electrical current. The
signal is then converted to a voltage and amplified by a
low noise transimpedance amplifier. Further gain is
provided by the quantizer, which also provides a Flag
output when the optical signal falls below an acceptable
level. The signal is then input to a SAW-filter timing
recovery circuit where the the clock signal is recovered,
and the data signal is reshaped and retimed.
The clock recovery and data retiming function is
achieved using a SAW filter technique which is well
established and proven through years of application in
high performance telecom systems.
The clock is extracted from the input NRZ data by first
passing it through a frequency doubler to generate
sufficient spectral energy at 155 MHz. The SAW filter,
a precision narrow band filter, then suppresses jitter by
rejecting unwanted frequency spectrum. The extracted
clock is then precisely aligned with the data and the
signals are reshaped.
The output signal is thus free of undesirable jitter and
distortion. Unlike phase-looked loop designs, the jitter
transfer function of the SRM-155’s timing recovery
circuit is uniquely stable because it is determined by the
shape of the SAW filter’s response, which can be
precisely controlled. In addition to low output jitter and
excellent stability, the SRM-155’s timing recovery circuit
exhibits fast acquisition time and robust operation
Signal
Figure 1. SRM-155 Functional Block Diagram
Optical
Clock
4
Clock
5
Ground
1,2,3 6,8,13,
15,16
Vd
10
No User
Connection
17, 18, 19, 20
Vcc
11
InGaAs pin
Photodiode
GaAs Zt
Preamplifier
Si
Quantizer
Si
Decision Circuit
SAW Timing
Recovery
Flag
14
Flag
12
Data
9
Data
7
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| SRM-155A | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| SRM-155B | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| SRM-155C | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecomm/Datacomm |
| SRM155-SERIES | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Optoelectronic |
| SRM-16 | 制造商:E-SWITCH 制造商全稱:E-SWITCH 功能描述:SRJ / SRK / SRM / SRT Series |
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