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Transmission of Multiple Signals through an Optical Fiber Using Wavefront Shaping

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Highspeed multiplexed heterodyne interferometry.

Katharina-S Isleif, Oliver Gerberding, Sina Köhlenbeck

|October 17, 2014

Summary

This summary is machine-generated.

Digitally enhanced heterodyne interferometry enables high-speed, multiplexed measurements of closely spaced targets. This technique achieves a displacement noise floor below 3 pm/√Hz, crucial for compact optical systems.

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Area of Science:

Metrology and optical sensing
Laser interferometry
Signal processing

Background:

Classic laser interferometers have limitations in optical layout flexibility.
Digitally enhanced heterodyne interferometry (DEHI) uses pseudo-random noise codes for phase modulation.
DEHI allows isolation of multiple signals from the same beam path based on propagation delay.

Purpose of the Study:

To present a high-speed version of DEHI for measuring multiple, spatially proximate targets.
To demonstrate the feasibility of multiplexed measurements using free beams in compact optical setups.
To assess the performance and limitations of high-speed DEHI.

Main Methods:

Implementation of a high-speed DEHI system with 1.25 GHz modulation and sampling rates.
Experimental setup to measure targets separated by 36 cm.
Application of an active clock jitter correction scheme.

Main Results:

Successful demonstration of multiplexing between targets separated by 36 cm.
Achieved a displacement measurement noise floor of <3 pm/√Hz at 10 Hz.
Identified a low-frequency excess noise unique to the technique, likely due to finite bandwidth.
Reduced the excess noise by one order of magnitude using clock jitter correction.

Conclusions:

High-speed DEHI is suitable for compact optical setups, including space-based interferometers.
The technique offers precise displacement measurements for closely spaced targets.
Active clock jitter correction is effective in mitigating a key noise source in DEHI.