Adjustable optical delay line

An optical delay line having a line input and a line output and having a variable delay, comprising:

• a light waveguide connected between the line input and the line output, the light waveguide being wound on a coil body;
• and
• a device for adjusting and controlling the temperature of the light waveguide;
• the waveguide and coil body are arranged in a heatable liquid.

A multiplexer for optical digital signals, comprising:

• optical delay lines each having a line input and a line output and having a variable delay;
• each of said optical delay having a light waveguide connected between the line input and the line output and having a device for adjusting and controlling the temperature of the light waveguide;
• a source of optical pulses that are comparatively short compared to a repetition rate of the optical pulses;
• a first modulator connected to the source of optical pulses;
• a series circuit of a first optical delay line and a second modulator connected to said source of optical pulses;
• a delay of the first optical delay line corresponding to a bit period of the optical digital signals;
• outputs of the first and second modulators being operatively connected to a common light waveguide connected to an optical output of the multiplexer;
• the optical delay line and the modulator being interchangeable in a respective series circuit;
• the waveguide and coil body being arranged in a heatable liquid.

A multiplexer for optical digital signals, comprising:

• optical delay lines each having a line input and a line output and having a variable delay;
• each of said optical delay having a light waveguide connected between the line input and the line output and having a device for adjusting and controlling the temperature of the light waveguide;
• a source of optical pulses that are comparatively short compared to a repetition rate of the optical pulses;
• a first modulator connected to the source of optical pulses;
• a series circuit of a first optical delay lien and a second modulator connected to said source of optical pulses;
• a delay of the first optical delay line corresponding to a bit period of the optical digital signals;
• outputs of the first and second modulators being operatively connected to a common light waveguide connected to an optical output of the multiplexer;
• the optical delay line and the modulator being interchangeable in a respective series circuit;
• the coil body having a central bore in which a heating element, connected to a temperature control, is secured in highly thermally conductive fashion.

A multiplexer for optical digital signals, comprising:

• a plurality of optical delay lines each having a line input and a line output and having a variable delay;
• each of said optical delay lines having a light waveguide connected between the line input and the line output and having a device for adjusting and controlling the temperature of the light waveguide;
• a source of optical pulses that are comparatively short compared to a repetition rate of the optical pulse;
• a plurality of modulators;
• a first modulator of said plurality of modulators connected to the source of optical pulses;
• a plurality of series circuit, each having a respective optical delay line of said plurality of optical delay lines and a respective modulator of said plurality of modulator, connected to said source;
• a delay of a first optical delay line of said plurality of optical delay lines corresponding to a bit period of the optical digital signals and a delay of further optical delay lines, of said plurality of optical delay lines, corresponding to a bit period that is longer than a bit period of a preceding optical delay line of said plurality of delay lines;
• outputs of the modulators being operatively connected to a common light waveguide that is connected to an optical output of the multiplexer;
• an optical delay line and a modulator being interchangeable in a respective series circuit;
• the light waveguide being wound on a coil body;
• the waveguide and coil body being arranged in a heatable liquid.

A multiplexer for optical digital signals, comprising:

• a plurality of optical delay lines each having a line input and a line output and having a variable delay;
• each of said optical delay lines having a light waveguide connected between the line input and the line output and having a device for adjusting and controlling the temperature of the light waveguide;
• a source of optical pulses that are comparatively short compared to a repetition rate of the optical pulse;
• a plurality of modulators;
• a first modulator of said plurality of modulators connected to the source of optical pulses;
• a plurality of series circuit, each having a respective optical delay line of said plurality of optical delay lines and a respective modulator of said plurality of modulator, connected to said source;
• a delay of a first optical delay line of said plurality of optical delay lines corresponding to a bit period of the optical digital signals and a delay of further optical delay lines, of said plurality of optical delay lines, corresponding to a bit period that is longer than a bit period of a preceding optical delay line of said plurality of delay lines;
• outputs of the modulators being operatively connected to a common light waveguide that is connected to an optical output of the multiplexer;
• an optical delay line and a modulator being interchangeable in a respective series circuit;
• the light waveguide being wound on a coil body;
• the coil body having a central bore in which a heating element, connected to a temperature control, is secured in highly thermally conductive fashion.