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參數(shù)資料
| 型號(hào)： | QDFT-025-001 |
| 英文描述： | FIBER OPTIC RECEIVER |
| 中文描述： | 光纖接收 |
| 文件頁數(shù)： | 1/4頁 |
| 文件大小： | 581K |
| 代理商： | QDFT-025-001 |
2000
Corning Lasertron 2000 Product Guide
38
QDFT Series
High-Sensitivity Transimpedance
pinFET Receiver
TRANSIMPEDANCE DESIGN CIRCUITRY
I
Fixed transimpedance circuit configuration
I
Hybrid construction
I
Industry-standard 14-pin dual-in-line package
I
Multimode fiber
Description
The Corning Lasertron QDFT pinFET module is a high-sensitivity detector and hybrid
preamplifier module designed for fiber-optic receivers operating at data rates up to and
exceeding 420 Mb/s at 1300 and 1550 nm wavelengths. The transimpedance circuitry
provides excellent sensitivity and superior dynamic range. The high sensitivity results from
use of an advanced GaInAs detector element having <10 nA leakage and a responsivity of
>0.8 A/W at 1300 and 1550 nm.
Sensitivities range from -53 dBm at 18 Mb/s, to -43 dBm at 140 Mb/s. Optical dynamic
range exceeds 25 dB. Operation requires only +5 V power supplies at modest bias currents.
The QDFT is packaged in a hermetically sealed, low-profile, 14-pin DIL package and is
pigtailed with multimode fiber.
Specifications and Ordering Information
QDFT Low-Bandwidth pinFET Receiver, page 39
QDFT Moderate-Bandwidth pinFET Receiver, page 40
QDFT High-Bandwidth pinFET Receiver, page 41
Applications
The Corning Lasertron QDFT pinFET module consists of a low-capacitance,
front-illuminated planar detector element followed by a hybrid transimpedance amplifier.
Benefits of the transimpedance design of the QDFT pinFET module include excellent
dynamic range and ease of implementation. The QDFT pinFET requires no equalization
and is self-biasing. Simply by applying +5 V and -5 V supplies to the amplifier circuit, and
a -5 V supply to the detector element, the device is ready to receive an optical input through
a multimode fiber-optic pigtail.
The diagram to the left illustrates the fundamental operation of a QDFT pinFET. As
incident light illuminates the detector, a small signal current is produced which is directly
proportional to the amplitude of the incident light source (P
i
) and the responsivity (R) of
the detector.
This simple relationship of R
P
i
yields the output signal current (I
s
). This current is
then converted to a voltage with the transimpedance resistor (Z
t
) and a gain block amplifier.
The resulting signal voltage (V
s
) is simply derived from the quantities I
s
Z
t
.
Pin Connections
1
Detector Bias (-5 V)
2
NC
3
Case Ground
4
-5 V
5
Case Ground
6
NC
7
Output
8
Case Ground
9
NC
10 +5 V
11 NC
12 NC
13 NC
14 NC
(Bias and interface circuit)
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