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1310 nm Single-mode Transceiver (S1.1)
1x9, SC Duplex Connector, 3.3 V
155 Mbps ATM/SONET OC-3/SDH STM-1
Headquarters :
No. 669, Sec. 4 Chung Hsing Road
Chudung, HsinChu, Taiwan 310, ROC
Tel: +886-3-582-8270
Fax: +886-3-582-8416
Version 3.3
4/10
Date: 2003/02/17
http:// www.ritekom.com
Block Diagram of Transceiver
POST
AMPLIFIER IC
LASER
DRIVER
IC
RRE-
AMPLIFIER
IC
LASER
DATA
DATA/
DATA
DATA/
ELECTRICAL SUBASSEMBLY
OPTICAL
SUB-
ASSEMBLIES
PIN PHOTODIODE
DUPLEX SC
RECEPTACLE
SIGNAL
DETECT
TOP VIEW
Transmitter Section
The transmitter section consists of a 1310 nm InGaAsP laser in an eye safe optical subassembly (OSA) which mates to the
fiber cable. The laser OSA is driven by a LD driver IC which converts differential input LVPECL logic signals into an analog
laser driving current.
Receiver Section
The receiver utilizes an InGaAs PIN photodiode mounted together with a trans-impedance preamplifier IC in an OSA. This
OSA is connected to a circuit providing post-amplification quantization, and optical signal detection.
Receiver Signal Detect
Signal Detect is a basic fiber failure indicator. This is a single-ended LVPECL output. As the input optical power is
decreased, Signal Detect will switch from high to low (deassert point) somewhere between sensitivity and the no light input
level. As the input optical power is increased from very low levels, Signal Detect will switch back from low to high (assert
point). The assert level will be at least 1.0 dB higher than the deassert level.
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