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O/E Converter Selection Guide

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*O/E Converter Selection Guide

Graviton provides optical to electrical (O/E) converters with eleven different series: SPD, SPA, SPS, LPD, LPS, DLP, MPR, MWL, WRU, WRTL, and WRU-NIM. Each series has different models depending on receivable wavelength range, reference wavelength, maximum light-receiving diameter, maximum NA, and convertible frequency bandwidth.
This selection guide offers the outline of each series. For details, please refer to each model.

* Visible wavelength O/E (Max NA = 0.2, 0.25)

SPD Series O/E Converter

Model

Name

Receivable Wavelength Range Reference Wavelength Sensitivity

Max.

core diameter

Max.

NA.

Convertible Frequency Bandwidth tr/tf
SPD-1_650nm 320 to 1000nm 658nm 500V/W 0.8mm 0.2 DC to 1.2GHz 290ps
SPD-1_850nm 320 to 1000nm 850nm 500V/W 0.8mm 0.2 DC to 1.2GHz 290ps
SPD-2_520nm 380 to 1000nm 520nm 1000V/W 1.0mm 0.25 DC to 1.2GHz 290ps
SPD-2_650nm 380 to 1000nm 658nm 1000V/W 1.0mm 0.25 DC to 1.2GHz 290ps
SPD-2_850nm 380 to 1000nm 850nm 1000V/W 1.0mm 0.25 DC to 1.2GHz 290ps
SPD-3 380 to 950nm 850nm 500V/W 0.5mm 0.25 DC to 2.0GHz 190ps
SPD-4 380 to 1000nm 850nm 300V/W 0.5mm 0.25 DC to 3.0GHz 150ps

* Visible wavelength O/E (Max NA = 0.5)

SPA Series O/E Converter

Model

Name

Receivable Wavelength Range Reference Wavelength Sensitivity

Max.

core diameter

Max.

NA.

Convertible Frequency Bandwidth tr/tf
SPA-2_650nm 400 to 1000nm 658nm 1000V/W 1.0mm 0.5 DC to 1.0GHz 370ps
SPA-3 380 to 950nm 850nm 500V/W 0.25mm 0.5 DC to 2.0GHz 190ps
SPA-4 380 to 950nm 850nm 300V/W 0.25mm 0.5 DC to 3.0GHz 150ps

* Visible wavelength O/E (Hi-Sensitivity)

SPS Series of O/E Converter

Model

Name

Receivable Wavelength Range Reference Wavelength Sensitivity

Max.

core diameter

Max.

NA.

Convertible Frequency Bandwidth tr/tf
SPS-1_10KV/W 320 to 1000nm 850nm 10KV/W 0.8mm 0.2 DC to 100MHz 3.6ns
SPS-1_100KV/W 320 to 1000nm 850nm 100KV/W 0.8mm 0.2 DC to 15MHz 28ns
SPS-2_10KV/W 400 to 1000nm 850nm 10KV/W 1.0mm 0.5 DC to 100MHz 3.6ns
SPS-2_100KV/W 400 to 1000nm 850nm 100KV/W 1.0mm 0.5 DC to 15MHz 28ns

* NIR wavelength O/E

LPD, LPS Series of O/E Converter

Model

Name

Receivable Wavelength Range Reference Wavelength Sensitivity

Max.

core diameter

Max.

NA.

Convertible Frequency Bandwidth tr/tf
LPD-1 900 to 1650nm 1310nm 500V/W 0.08mm 0.2 DC to 1.5GHz 250ps
LPD-2 950 to 1650nm 1310nm 1000V/W 0.5mm 0.25 DC to 1.5GHz 250ps
LPS-1_20KV/W 900 to 1650nm 1310nm 20KV/W 0.08mm 0.2 DC to 100MHz 3.5ns
LPS-2_20KV/W 950 to 1650nm 1310nm 20KV/W 0.5mm 0.25 DC to 100MHz 3.5ns

** For 650nm standard model and 850nm standard model **

Photodetector, which is currently build in SPD-1SPD-2, and SPA-2, has the wavelength dependency of a frequency characteristic, and the frequency characteristic of photodetector changes in the range of, approximately, 1MHz to 100MHz. Therefore, a frequency characteristic of SPD-1_650nm, SPD-2_650nm, and SPA-2_650nm, is designed and tuned to be flat at 650 nm. Also, the frequency characteristic of SPD-1_850nm and for SPD-2_850nm is designed to be flat at 850 nm. For customers who need several wavelengths measurements, it is recommend the use of SPD-3, SPD-4, SPA-3, SPA-4 with PD which has less frequency characteristic dependence on the wavelength.



** About the minimum fiber diameter **

The core diameter of the fiber, to be connected to the SPA-2_650nm, is 100um diameter or more. When a fiber with a thin fiber core diameter is used, the optical spot at the photodetector becomes so small, that the frequency characteristics of the product is not maintained.

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