This document describes the methods and specifications for using Philips optical receivers in CATV applications, including mechanical outlines, pinning and glass fibre specifications, responsivity, flatness and slope of frequency response, input and output return losses, second and third order distortion, total current consumption, photodiode bias current, equivalent input noise, and test setup and application considerations for the optical receiver.
This application note explains how to use Philips optical receiver modules in CATV systems. It covers mechanical outlines, pin assignments, glass‑fibre handling, and the electrical characteristics of the devices such as responsivity and impedance.
The document also provides detailed measurement methods for frequency‑response flatness, slope, return loss, and noise calculations, as well as practical information on optical connectors, package outlines, and test setups.
| Nominal mode field diameter | 9.3 µm ±5 µm |
|---|---|
| Cladding diameter | 125 µm ±1 µm |
| Primary coating diameter | 245 µm ±10 µm |
| Secondary coating diameter | 900 µm |
| Minimum bending radius | 32 mm |
| Maximum pulling force | 6 N |
| Photodiode monitor voltage output (typ.) | 0.85 V/mW |
| Output impedance | 75 Ω |
| DC output responsivity | 2 V/W |
| Minimum loss pad attenuation | 5.7 dB |
The typical voltage output is 0.85 V per milliwatt of optical power.
The fibre has a nominal mode field diameter of 9.3 µm ± 5 µm, cladding diameter 125 µm ± 1 µm, primary coating 245 µm ± 10 µm, and secondary coating 900 µm.
Flatness can be measured using either the cable‑curve method, which compares the measured response to an ideal curve, or the straight‑line method, which uses the deviation between measurements at 40 MHz and 870 MHz.
The output impedance is 75 Ω.