Encyclopedia … combined with a great Buyer's Guide!

Velocity-matched Photodetectors

Definition: a type of photodetector where propagation velocities of light and electrical signals are matched in order to achieve a very high detection bandwidth

Alternative term: traveling-wave photodetectors

Category: photonic devicesphotonic devices


Cite the article using its DOI: https://doi.org/10.61835/llr

Get citation code: Endnote (RIS) BibTex plain textHTML

Velocity-matched photodetectors (or traveling-wave photodetectors) are photodetector devices which allow the detection of light with the favorable combination of very high bandwidth (tens of gigahertz) and very high photocurrents (tens of milliamperes). For conventional photodiodes, there is a trade-off between bandwidth and photocurrent. In velocity-matched photodetectors, that trade-off is eliminated by combining several small-area photodetectors, which are weakly coupled to an optical waveguide (so that each one absorbs only a part of the optical power) and deliver their photocurrents into a common RF waveguide structure. The propagation velocities of the optical and electrical signals are matched to each other so as to maximize the device bandwidth.

Such devices are useful for microwave optics, e.g. for optoelectronic generation of microwaves or for microwave fiber-optic links.

More to Learn

Encyclopedia articles:


[1]K. S. Giboney et al., “Traveling-wave photodetectors”, IEEE Photon. Technol. Lett. 4 (12), 1363 (1992); https://doi.org/10.1109/68.180577
[2]L. Y. Lin et al., “Velocity-matched distributed photodetectors with high saturation power and large bandwidth”, IEEE Photon. Technol. Lett. 8 (10), 1376 (1996); https://doi.org/10.1109/DRC.1996.546434

(Suggest additional literature!)

Questions and Comments from Users

Here you can submit questions and comments. As far as they get accepted by the author, they will appear above this paragraph together with the author’s answer. The author will decide on acceptance based on certain criteria. Essentially, the issue must be of sufficiently broad interest.

Please do not enter personal data here; we would otherwise delete it soon. (See also our privacy declaration.) If you wish to receive personal feedback or consultancy from the author, please contact him, e.g. via e-mail.

Spam check:

By submitting the information, you give your consent to the potential publication of your inputs on our website according to our rules. (If you later retract your consent, we will delete those inputs.) As your inputs are first reviewed by the author, they may be published with some delay.