Graviton VL-850GI User manual

User’s Manual
VL-850GI
850nm
2.5GHz E/O CONVERTER
Graviton INC
https://www.graviton.co.jp/index_En.html
Page 1
！！！DANGER！！！
This Unit is Class 1A LASER Product. Please read and
handle this product carefully to avoid eye damage.
◇Do not the power switch on till both ends of the fiber
cable and the power cable are connected properly.
◇Always keep the protect cap attached to the Optical
Signal Output Connector when not in use.
◇Do not observe inside of the Optical Signal Output
Connector directly. It may result permanent damage on
eyes.
◇Do not observe optical signal output directly
through an optical instrument such as magnifier etc.
◇Do not observe optical signal from the end of the
optical cable, if the signal is emitted into open
air.
◇Do not disassemble and/or modify this unit.
Page 3
Introduction
Thank you for purchasing VL-850GI.
VL-850GI is Electric to Optical signal converter and has following feature.
・Very compact size and more than 0.2[mW] CW optical power at fiber end with
no modulation.（With 5[m]length 50/125 fiber）
・Wide frequency range
100kHz～2.5GHz Flatness ±2[dBe]
・Standard FC optical connector
（Optional SC and ST connector are also available）
・Standard BNC plug
Able to connect directly to a sweep generator or a network analyzer etc.
・Able to get DC power from instruments through included Power Cable Assembly.
※It is not guaranteed that power cable corresponds to all instruments.
・Able to use for instrumentation of lightwave products, optical links or
other various applications with O/E converter, PD&PA series.
Please read this user’s manual carefully and use it appropriately
according to this manual, will make this product useful for development
of light wave equipments, lightwave communication converter or other
various applications.
◇Do not re-produce or re-publishing a part or all this manual without
written permission from Graviton Inc.
◇This manual is subject to change without notice.
◇Please follow exporting regulations/rules in individual countries
when exporting this product to other countries.
Page 2
Contents of this package
The contents of this package are listed below.
Please contact immediately the shop you purchased this product, if there are
any missing items found.
①② ③
④
①E/O Converter ④User’s Manual(This Manual)
②Power Cable Assembly
③Auxiliary Power Connector
◇Please keep original packaging, in case of re-shipping.
Page 4
Please read this manual carefully before use

Front and rear panel view
①Power switch
This switch is for controlling power. Please on this switch after
connecting power cable assembly to power connector(②) and keep this
switch off when not in use.
②Power input connector
The power can be supplied from probe power connector that equipped with
an instrument through the Power Cable Assembly. Or, alternately, external
regulated power supply (not included) can be used through the Auxiliary
Power Connector. Power supply voltage for VL-850 is +15[V]. Applying over
and/or wrong polarity may cause permanent damage.
③Optical signal output connector
Light signal comes out from this FC connector. Optional SC and ST
connecter models are also available. Please keep protect cap attached with
this unit, to this connector to avoid light emission inadvertently when
not in use.
④Electrical modulation signal input connector
Modulation signal is supplied through this BNC connector and this unit
has 50[Ω] input impedance. The modulation frequency range is 100[kHz]
～2.5[GHz].
Page 5
5. Adjust modulation level and frequency. Appropriate P-P modulation level is
approximately 1/3 of conversion sensibility that is on the data sheet. Beyond
this level makes the optical output signal lower than threshold level of Laser
device causes clipping of the optical output signal. Applying higher than twice
of the conversion sensibility may cause permanent damage.
]/[ ][fibertheofOutput@end
2][ VmWGainConversion mW pVpVoltageModulation −
6. An external power supply is necessary, if an instrument going to use has
no probe power output. The requirements for the power supply are
regulated+15[V]±5[%] and capable of supplying more than 100[mA] current
with low ripple and noise. And connect as following figure.
Wrong power supply connection may cause permanent damage on the E/O
converter. Please make sure the connection as RED Cable for Positive
terminal, Black Cable for Ground Terminal and Blue Cable for Open Terminal.
7. Panel cutout size is as following to mount the Auxiliary Power Connecter
on a panel, if necessary. Maximum allowable thickness of the panel is 5mm.
Setup
1. First of all, connect the VL-850GI to output connector of an instrument.
Conversion connector may be required, if the instrument has no BNC jack.
2. Confirm power switch on VL-850GI is off then connect Power Cable Assembly
supplied. Other side of the Power Cable can be connected to the instrument, if
probe power connector is equipped. Please refer page 7 for connecting external
power supply, if the instrument has no probe power connector.
3. Connect fiber connector to optical signal output connector. CW optical power
at fiber end with no modulation is more than 0.2[mW] with 50/125 GI fiber.
Please use polished fiber of PC, SPC, UP, AdPC. Do not use APC polished fiber.
Keep clean the end of the fiber. Quartz glass for reduction of return light in
FC receptacle becomes dirty and will be broken, if dust goes into inside.
4. Turn on the power switch. Do not the power switch on without optical fiber
cable connect both ends properly.
Page 6
Specifications
VL-850GI
・Laser Device VCSEL
・Wavelength
850±10[nm]
・Output power with More than 0.2[mW] @ end of the fiber.
no modulation （50/125GI Fiber 5[m]length）
・Optical Output Connector FC receptacle（JIS F01）
・Modulation signal input connector BNC Plug, Optionally SMA is available
・Input impedance 50[Ω]
・Modulation Sensibility High than 0.25[mW/V]
・Modulation signal frequency range 100[KHz]～2.5[GHz]
・Frequency response ±2[dBe] within the frequency range
above（300[KHz]is reference point）
・Power supply voltage +15[V]±5[%]
・Current consumption Maximum 100[mA]
・Operational temperature 5[℃]～35[℃]
・Storage temperature -20[℃]～50[℃]
・Dimension L 93[mm]、W 44[mm]、H 21[mm]
（Including the protect cap etc.）
・Weight 110[g]
Optional
・OP01 SC or ST optical connecter equipped model
（Specification of these model may change without notice.）
Page7
+15V(RED)
GND(BLACK)
Open(BLUE)
No.20220831-0
1
Page8
Contact to : Graviton Inc.
1-8-1 Kasuga-cho, IRUMA-SHI, SAITAMA, 358-0006 JAPAN
TEL：[phone] FAX：[phone]
“GRAVITON” is trade mark of Graviton lnc. in Japan.
Copyright 2006 by Graviton Inc. All right reserved.
Never reproduce or republish without written permission.