Application examples of compact wavemeters:

Photonic Fiber Optic Sensors

The figure above shows a type of photonic fiber optic sensor, such as

– GaAs temperature sensor

– Refractive index sensor (localized surface plasmon resonance)

– Photonic crystal structure

A broadband light source (usually a laser diode or LED) is coupled to a single-mode optical fiber. At the end of the fiber, a photon sensor element reflects a certain part of the light spectrum. This reflected light is guided to a detector with a fiber circulator. The sensor element operates in such a way that the spectral peak of the reflected light varies with the physical quantity of interest.

Since compact wavelength meters are not limited to measuring narrow-band laser radiation, they are well suited to measuring these spectral shifts.

Compared with the spectrometer, the wavelength meter has the following characteristics:

– Faster

- Smaller

– Mechanically strong

- Accurate in low light conditions

The OEM version of the compact wave meter can

– Tuned to a specific wavelength range

– Sampling speed/bandwidth has been improved

– Expandable to multiple measurement channels

Stabilized laser module

The compact wavelength meter can be used to stabilize the wavelength of tunable lasers, such as laser diodes. It provides an accurate and fast wavelength signal. Suitable control electronics can form a feedback loop to lock the wavelength and provide continuous tuning within the mode-hop-free tuning range of the laser diode.

Compared to other wavelength references, it is cheap, much smaller, and very easy to integrate into laser modules.

Production Test

Due to its high data rate and easy alignment, it is ideally suited for production testing of laser diodes.

Large numbers of laser diodes can be tested without the need for fiber coupling or precise free-space alignment. It can characterize the temperature and drive current dependence of lasers in a fraction of the time of other spectral measurement equipment.

General parameters

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