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OPTICALMEASURINGINSTRUMENTS

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Convenient light source option (reference wavelength or white light) for better accuracy

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Measurement of modulated and pulsed light The synchronization signal for the measured modulated/pulsed light is input to the external input trigger on the rear panel. With this ana- lyzer, the data can be held by this sync signal. As a result, the spec- trum of the modulated or pulsed light can be measured accurately without data loss. In addition, an optical source that does not have a sync signal can be measured in the same manner by setting an ap- propriate gate time. The waveform in the diagram on the right shows measurement of an optical pulse (OTDR’s light source) with a pulse width of 1 µs and a duty cycle of 1%. However, for accurate spectrum measurement, the VBW must be set to a wider bandwidth than the modulation frequency of the measured light (see below). The maxi-mum settable VBW in the MS9710B is 1 MHz. (Refer to the specifica-tions page for the relationship between VBW, received light sensitiv- ity and sweep time.) The Wavelength reference & SLD light source (Option 13), SLD light source (Option 14), Wavelength reference light source (Option 05), and White light source (Option 02) can each be installed in the MS9710B. The block diagram of the SLD light source and reference wavelength light source option is shown below. This option has two separate output ports: Port 1 for wavelength calibration and Port 2 for measuring transmission characteristics. When the MS9710B is cali- brated automatically by inputting the reference light for the wave- length, post-calibration wavelength accuracy in the 1.52 to 1.57 µm range is better than ±0.05 nm. This is very useful in precision ab- solute measurement of the wavelengths of light sources used in WDM systems.

SLD light source Acetylene(C Port 1 (reference wavelengthlight output)Port 2 (SLD light output)
2 H
2 ) cell SM fiberSM fiber

Block diagram of SLD light source & reference wavelength light The following diagram shows the spectrum of the SLD light outputfrom Port 2. When this light source is used instead of the earlier white light source for measurement of the wavelength transmission characteristics of optical receiver elements, it is possible to achieve a 20 dB wider dynamic range. Spectrum of SLD light source

Specifications?

MS9710B

Fiber10/125 µm SM fiber (ITU-T G.652) Optical connector
∗ 1 User replaceable: FC, SC, ST, DIN, HMS-10/AFactory option (not user replaceable): E-2000, EC (Radial), FC-APC, SC-APC, HRL-10 Range: 600 to 1750 nm Accuracy:±0.2 nm (1530 to 1570 nm, after wavelength calibration)±0.3 nm (600 to 1750 nm, after wavelength calibration)±0.05 nm (1530 to 1570 nm, resolution: 0.07 to 0.2 nm, after calibration with wavelength reference light source option)±0.1 nm (1530 to 1570 nm, resolution: 0.5 to 1 nm, after calibration with wavelength reference light source option)WavelengthStability: ±5 pm (smoothing: 11 points, 1 minute, at half-width center wavelength)Linearity: ±20 pm (1530 to 1570 nm)Resolution: 0.07, 0.1, 0.2, 0.5, 1 nm Resolution accuracy
∗ 2 :± ≤ 2.2% (resolution: 0.5 nm, 1550 ±20 nm), ± ≤ 7% (resolution: 0.5 nm, at other wavelength), ± ≤ 3% (resolution: 0.2 nm, 1550 ±20 nm), ± ≤ 15% (resolution: 0.2 nm, at other wavelength),± ≤ 7% (resolution: 0.1 nm, 1550 ±20 nm), ± ≤ 30% (resolution: 0.1 nm, at other wavelength) Measurement range:–65 to +10 dBm (600 to 1000 nm, +10 to +30ËšC, VBW: 10 Hz, sweep averaging: 10 times)–85 to +10 dBm (1000 to 1250 nm, +10 to +30ËšC, VBW: 10 Hz, sweep averaging: 10 times)–90 to +10 dBm (1250 to 1600 nm, +10 to +30ËšC, VBW: 10 Hz, sweep averaging: 10 times) –75 to +10 dBm (1600 to 1700 nm, +10 to +30ËšC, VBW: 10 Hz, sweep averaging: 10 times)Level–55 to +10 dBm (1700 to 1750 nm, +10 to +30ËšC, VBW: 10 Hz, sweep averaging: 10 times)–65 to +20 dBm (1100 to 1600 nm, attenuator: on)Accuracy: ±0.4 dB (1300/1550 nm, –23 dBm, resolution: ≥ 0.1 nm)Stability: ±0.02 dB (1550 nm, –23 dBm, resolution: ≥ 0.1 nm, 1 minute, constant temperature, no polarization shift)Linearity: ±0.05 dB (1550 nm, 0 to –50 dBm) Flatness: ±0.1 dB (1530 to 1570 nm) Continued on next page

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