Fiber Optic Design Guide - Maite y Mario

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Power Meter Output (Volts) 12 11 10 9 8 7 6 5 4 3 2 1 0 1 2 3 4 5 6 7 8 9 10 Optical Input (mW) Figure 1.4 - Optical Input (mW) vs. Power Meter Output (Volts) Figures 1.3 and 1.4 show the response of the built-in optical power meter circuit in both dBm and mW. The dotted line shows the typical, expected response of the circuit. Because the accuracy of the reading is affected by the variable mating loss of the input optical connector, there is an error band of ±0.5 dB represented by the solid lines. For instance if the optical input power was +6 dBm, the circuit would ideally output +5.0 Volts. Considering the possible errors introduced by the optical connector, the reading could be as low as +4.5 Volts or as high as +5.4 Volts. Note that the circuit outputs a voltage of +1.0 Volts with no light input. The 7412-PA incorporates an optical attenuator that allows the user to adjust the incoming optical signal to the optimum input of 2 mW (+3 dBm). This attenuator should be used as follows: Align the red dot on the top of the attenuator with the red line painted on the outer fixation ring. Next take a reference reading from pin J2-4 to determine the optical power reaching the receiver. With the red dot and line aligned, slowly rotate the inner control ring of the attenuator until the voltage on pin J2-4 reads 3 Volts which is equal to the optimum input voltage of 2 mW (+3 dBm). (An attenuator adjustment tool is included.) After the desired attenuation is reached, use the adjustment tool to turn the outer fixation ring 45° in either direction to lock the control ring in place. NOTE: Do not try to rotate the control ring unless the red dot and the red line are aligned. Do not turn either ring to their end points, or the attenuator may break. PART NUMBERS AND CONFIGURATIONS Transmitter Part Numbers Part Number Tx Optical Output Recommended Max. CATV Channel Loading Optical Connector Type* Link Loss 7403-6 +6 dBm 7 dB 80 FC/APC 7403-7 +7 dBm 8 dB 80 FC/APC 7403-8 +8 dBm 9 dB 80 FC/APC 7404-9 +9 dBm 10 dB 110 FC/APC 7404-10 +10 dBm 11 dB 110 FC/APC 7404-11 +11 dBm 12 dB 110 FC/APC 7404-12 +12 dBm 13 dB 110 FC/APC Part Number Rx Optical Field Receiver Part Numbers CATV Channel Loading Optical Connector Type* 7412-P Integral Optical Power Meter 80/110 FC/APC 7412-PA Integral Optical Power Meter with Field Optical Attenuator 80/110 FC/APC 7434 80/110 FC/APC * NOTE: The FC/APC interface on the units use the “wide-key” standard. This means that the units are optimized for use with FC/APC connectors that have a 2.14 mm wide alignment key. This allows “narrow-key” FC/APC connectors to be used with the units. “Narrow-key” FC/APC connectors (2.02 mm) often referred to as JDS compatible, may be used but will produce inferior results. Standard FC/APC connectors have a 2.36 mm wide key and cannot be plugged into either unit. Section 2 28
CONNECTIONS Transmitters Connector Number Connector Type Connector Function J1 Accepts a standard IEC power cord Power Input J2 FC/APC* Optical Output It is imperative that backreflections be controlled to very low levels. J3 F Type RF Input Pin Function J4-1 +5 V Power J4-2 RF Level Status J4-3 Laser Status J4 9-Pin D-Sub J4-4 TEC Cooler Status J4-5 No Connection J4-6 Ground J4-7 Ground J4-8 Ground J4-9 Ground Connector Number Receivers Connector Type Connector Function J1 FC/APC* Optical Input Pin Function J4-1 Power Supply 4 pin Weidmuller J4-2 Ground (Mating adapter provided) J4-3 Optical Signal Status J2 J4-4 Optical Power Meter J3 F Type RF Output * Note: The FC/APC interface on the Transmitters/Receivers uses the “wide-key” standard. This means that the units are optimized for use with FC/APC connectors that have a 2.14 mm wide alignment key. This allows “narrow-key” FC/APC connectors to be used with the units. "Narrow-key" FC/APC connectors (2.02 mm), often referred to as JDS compatible, may be used but will produce inferior results.Standard FC/PC connectors have a 2.36 mm wide key and cannot be plugged into either unit. Section 2 29
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Page 59 and 60: Stacked LNB, 950-2050 MHz FILT-S3A-
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Page 63 and 64: DECEMBER 1998 REFERENCE ICON KEY P
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Fiber Optic Design Guide - Maite y Mario

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