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Fiber Optic Frequency Transfer Modem VCH-607

The VCH-607 fiber-optic modem of reference signals is designed for receiving and transmitting electrical signals with nominal frequency 100 MHz through a fiber-optic system and generating electrical signals with nominal frequencies 5 and 10 MHz, coherent with the input signal.
Reception/transmission of high precision signals via the fiber optic communication line (FOCL) is provided using a pair of modems: one is configured as a Transmitter and installed at the end of the FOCL where the signal source is located, the second as a Receiver and installed at the opposite end of the FOCL.

Key applications:
− metrology;
− time scale comparison systems;
− production and testing of high precision oscillators and devices based on them;
− scientific research.

Specifications

The optical characteristics of the modem correspond to Class 1 of laser safety, according to IEC 60825-2-2013.
Optical signals are transmitted via the FOCL based on a single-mode optical fiber up to 200 m length.
The type of optical connectors is FC/APC.

Input electrical signals:
sinusoidal: 100 MHz, root mean square (RMS) voltage value (1 0.2) V at a load of 50 ohms;
Output electrical signals:
sinusoidal: 5 MHz, 10 MHz, 100 MHz, RMS voltage value (1 0.2) V at a load of 50 Ω;

Metrological characteristics
Averaging time, τ Allan deviation noise floor
1 s 1.0∙10−13
10 s 2.0∙10−14
100 s 5.0∙10−15
1 hour 7.0∙10−16

Dimensions (H×W×D) 140×236×326 mm.

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