Selection Guide-Graviton

O/E Converter Selection Guide

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Selection Guide

*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_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-1、SPD-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.