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Changing the Optical Output Power and Diode Current

T100S-HP User Guide

35

5.3

Disabling/Enabling Active Cavity Control

Subject

The T100S-HP is equipped with on-board active cavity control.
When you turn on the T100S-HP after the initialization routine is complete, the system 
switches automatically to APC (constant power) mode with active cavity control (the 
APC LED is on). 

Active Cavity Control Requirements

Active cavity control is enabled if the following requirements are both met:

•

APC (constant power) mode (APC LED on)

•

Power > 0.8 mW

System Status

System status is summarized in the following table:

Table 10: Active Cavity Control - System Status

Procedure

•

To disable active cavity control, press the

2nd

+

APC

key combination.

The 

APC

 LED blinks. 

If you press the 

APC

 key and the APC LED goes off, this indicates that the system 

has switched in constant current mode. When entering constant current mode, the 

active cavity control becomes disabled, and the system restores the operating 

parameters that were in effect at the time the T100S-HP last left the constant current 

mode.

•

To enable active cavity control, press the 

2nd

+

APC

 command keys again.

If the APC LED starts blinking while the T100S-HP is in APC mode with active cavity 

control on, this may indicate that the laser power output (P) is set to a value lower 

than the 0.8 mW threshold.

APC LED

Constant Power Mode

Active Cavity Control

On

Yes

Yes

Blinking

Yes

No

Off

No

No

Содержание T100S-HP Essential

Страница 1: ...www EXFO com T100S HP High Power Tunable Laser User Guide T100SHP_UM_6 06v1 2...

Страница 2: ......

Страница 3: ...er 2018 Manual Reference T100SHP_UM_6 06v1 2 Typographical Conventions Symbols bold Identifies interface objects such as menu names labels buttons and icons italic Identifies references to other secti...

Страница 4: ...tion of Warranty For detailed information about the sales terms and conditions visit the EXFO web site at www exfo com how to buy sales terms conditions Contact Information To obtain after sales servi...

Страница 5: ...own the Product 26 4 Setting Up the Emission Wavelength or Frequency 27 4 1 Changing the Emission Wavelength or Frequency 27 4 2 Setting a Predefined Increment Decrement Step 28 4 3 Using the Fine Sca...

Страница 6: ...ignals 49 8 2 2 Monitoring Outputs 49 8 2 3 Activating Deactivating the Output as a Trigger 49 9 Verifying Performances 51 9 1 Preparing the Product for Testing 51 9 2 Verifying the Absolute Wavelengt...

Страница 7: ...an international safety standard three wire power cable This cable serves as a ground when connected to an appropriate AC power outlet Important If you see the symbol on your unit make sure that you r...

Страница 8: ...therwise specified all interfaces are intended for connection to Safety Extra Low Voltage SELV circuits only To avoid electrical shock do not operate the unit if any part of the outer surface covers p...

Страница 9: ...mited to modules and external optical units Warning IEC 60825 1 2007 Viewing the laser output with certain optical instruments designed for use at a distance for example telescopes and binoculars may...

Страница 10: ...Important Safety Information for Your Product 10 T100S HP User Guide...

Страница 11: ...ly accurate and repeatable measurements Active wavelength monitoring This feature turns the T100S HP into a high precision tunable laser for DWDM component characterization Full featured wavelength sw...

Страница 12: ...ange 10 dBm 8 dBm Peak 13 dBm Signal to source spontaneous emission ratio 1 90 dB 100 dB typical Side mode suppression ratio 2 45 dB Stability 3 Wavelength 5 pm h 3 pm h 5 pm 24h typical Output Power...

Страница 13: ...14 6 x 5 2 in Weight 12 5 kg 27 5 lb All specifications are given after 60 minutes warm up and apply for wavelengths not equal to any absorption line 1 Measured over a 0 1 nm bandwidth 1 nm from the s...

Страница 14: ...ended Range models O CL O ES SCL CLU Laser diode current level I See the Acceptance Test Report delivered with the product Beam output power P 0 2 50 mW Wavelength scan steps nm Step mode 0 001 150 Sw...

Страница 15: ...cription of the Front Panel Figure 1 Front Panel DATA Area Description The DATA area displays the three main operating parameters Emission wavelength or optical frequency f Output power P Laser diode...

Страница 16: ...Constant Current Modes p 34 STEP Changes the wavelength increment STEP value see section Setting a Predefined Increment Decrement Step p 28 It is also possible to increase or decrease the wavelength...

Страница 17: ...enable backlash suppression of the micrometer screw see section Turning On Off Backlash Suppression of the Micrometer Screw p 32 2 To display the software version Remote To change the GPIB address and...

Страница 18: ...BNC connector for current monitoring TTL Outputs Mod Sync BNC connector for modulation sync TTL output Mod Out BNC connector for modulation output TTL output For a detailed description on particular...

Страница 19: ...options if any and date of manufacture Manufacturer Identification Contact information of the manufacturer Class 1M Laser Product The product is a class 1M laser product For more details see section O...

Страница 20: ...Product Presentation 20 T100S HP User Guide...

Страница 21: ...18 make sure the power switch is set to 0 6 On the front panel in the OUTPUT area make sure the key lock switch is in STBY position before applying power 7 Place the T100S HP in the wanted operating...

Страница 22: ...contact and that the electrical installation fulfills the local safety requirements The T100S HP has a chassis connected to ground via the power supply cable A protective ground connection by way of t...

Страница 23: ...ch Figure 4 Remote Interlock SUBD 9 Connector Opening the interlock switch disables the laser output To turn on the laser output close the interlock switch and press the Enable key When the system res...

Страница 24: ...Installing and Connecting the Product 24 T100S HP User Guide...

Страница 25: ...turning on the system 4 To skip the self calibration step skip Referencing while the message Initializing is displayed press the 0 key Once the initialization routine is complete the laser output is...

Страница 26: ...third display 2 On the front panel in the OUTPUT area turn the key lock switch counterclockwise to the STBY position The message Parking displays and the optical head is automatically moved to its par...

Страница 27: ...the wanted value is reached turn right to increase the value or left to decrease the value To modify the basic increment decrement applied by the rotary knob press the and arrow keys to set the scroll...

Страница 28: ...appears 4 In the SETUP area press the ENTER key 5 Increase or decrease the wavelength by pressing the or arrow keys in the SETUP area 4 3 Using the Fine Scanning Mode Fine Tuning Subject The Fine Sca...

Страница 29: ...t you set During each scan interval the T100S HP laser broadcast at a set wavelength for the duration specified by the Pause Timer parameter that you set Before Starting Before activating the waveleng...

Страница 30: ...enter the scan STEP while the current setting is displayed 5 Enter the scan STEP and press Enter To know the valid range for scan STEP values see section Valid Ranges for Parameter Settings p 14 The...

Страница 31: ...displayed 4 Enter 0 as scan STEP parameter and press Enter The DATA area display prompts you to enter the Pause Timer The PAUSE TIMER is the dwell time at the upper wavelength of the sweep range befor...

Страница 32: ...ch the nearest operational value i e 67 nm s 3 Press Enter to confirm the change 4 6 Turning On Off Backlash Suppression of the Micrometer Screw Subject The T100S HP firmware systematically implements...

Страница 33: ...n right to increase the value or left to decrease the value To modify the basic increment decrement applied by the rotary knob press the and arrow keys to set the scroll step at either 0 1 mW or 0 01...

Страница 34: ...s the APC function key to turn on the APC key LED The active mode is constant power the laser diode current is controlled to ensure an optical power output equal to the P parameter By pressing the P f...

Страница 35: ...ive Cavity Control System Status Procedure To disable active cavity control press the 2nd APC key combination The APC LED blinks If you press the APC key and the APC LED goes off this indicates that t...

Страница 36: ...he current parameter value is displayed When the sign flashes you can modify the value 2 Do one of the following Using the numeric keypad enter the wanted value If you make a mistake while entering th...

Страница 37: ...th within the tuning range and displays the power level corresponding to the current calibration data 4 Measure the power level at the first wavelength on the power meter 5 Enter the reading at the pr...

Страница 38: ...0 mA and 0 mW respectively Therefore as long as the system is in remote interlock mode it cannot perform any self calibration or internal referencing Procedure 1 Press the 2nd I function keys to start...

Страница 39: ...e wavemeter you are using configuration can be achieved either via soft panel controls or by hardware setting via a back panel dip switch For details on how to configure your wavemeter please refer to...

Страница 40: ...r of the wavemeter actual reading and self alignment of the tunable laser by iteration process to achieve the user defined target wavelength within the wavemeter s accuracy In order to achieve the use...

Страница 41: ...that the output signal wavelength closely matches the wavelength setting The message Moving is displayed at the front panel indicator until the output wavelength has reached the target value and has...

Страница 42: ...Enabling Active Wavelength Monitoring 42 T100S HP User Guide...

Страница 43: ...nals in the APC constant power mode from 30 kHz to 8 MHz for sinusoidal signals from 30 kHz to 1 MHz for TTL signals Modulation of the diode current is obtained by applying a signal anywhere between 0...

Страница 44: ...R is the 50 resistor of the LF modulation circuit With a maximum allowed voltage input of 5 volts the maximum input current you can add to the T100S HP laser diode is 100 mA Resulting LF Modulated Dio...

Страница 45: ...the modulation signal is well above the intrinsic frequency 1 kHz of the APC loop the average power is monitored and remains constant Modulation is possible in the APC mode at frequencies above 30 kHz...

Страница 46: ...modulation setup 2 Use High Frequency Modulation Important Before implementing external modulation via HF Mod input connector make sure the system s active cavity control is disabled see section Disa...

Страница 47: ...t way to fulfill the above conditions is to measure the system bias current Ib through the voltage on the current monitor output and to compute the total current using the following formula Where Idio...

Страница 48: ...above 30 kHz 8 1 3 Wavelength Modulation Before Starting Wavelength Fine Scanning The T100S HP has a wavelength fine tuning capability that can be used to adjust the wavelength very precisely or to se...

Страница 49: ...2 3 Activating Deactivating the Output as a Trigger Subject You can switch the output to a trigger TTL that is high when the T100S HP is scanning only in positive direction ignoring return and backla...

Страница 50: ...Using the Auxiliary Inputs and Outputs 50 T100S HP User Guide...

Страница 51: ...n Initializing the Laser p 25 3 Connect the laser output as described in section Connecting External Optical Devices to the product p 22 4 Enable the laser output as described in section Enabling Disa...

Страница 52: ...the measured wavelength is no greater than 0 04 nm away from each wavelength setting 9 3 Verifying Wavelength Range and Output Power Subject The following procedure verifies that the laser output can...

Страница 53: ...any residual emissions is lower than 45 dB down from the peak level 9 5 Verifying Wavelength and Power Calibration Subject During the course of the performance verification it is possible that the se...

Страница 54: ...Verifying Performances 54 T100S HP User Guide...

Страница 55: ...rge any propellant 2 Spray the clean compressed air on the connectors to remove any loose particles or moisture Warning To avoid personal injury do not operate this equipment without the protective co...

Страница 56: ...cord from the mains supply before cleaning 2 Clean the case with a slightly damp cloth with an isopropyl alcohol liquid 10 3 Replacing the Line Fuses Before Starting Unplug the power cord Make sure yo...

Страница 57: ...HP User Guide 57 10 4 Packaging for Shipment If you need to return the T100S HP to EXFO for servicing or calibration use the original packaging For instructions on returning the instrument please con...

Страница 58: ...Performing Basic Maintenance Operations 58 T100S HP User Guide...

Страница 59: ...error Press Enter The system parameter you are trying to configure is outside the valid range see section Valid Ranges for Parameter Settings p 14 Press Enter All changes are discarded and the previou...

Страница 60: ...not be compatible with the SCPI command set Please contact a EXFO representative for a list of compatible wavemeters The wavemeter remote interface may not be configured properly Configure the wavemet...

Страница 61: ...rmful interference in which case the user will be required to correct the interference at his own expense Modifications not expressly approved by the manufacturer could void the user s authority to op...

Страница 62: ...X indicates that said hazardous substance contained in at least one of the homogeneous materials used for this part is above the limit requirement of GB T 26572 Due to the limitations in current tech...

Страница 63: ...ge for Parameter Settings 14 Table 5 Available Accessories and Replaceable Parts 14 Table 6 DATA Area Function Keys 15 Table 7 MODE Area Function Keys 17 Table 8 SETUP Area Keys 17 Table 9 Rear Panel...

Страница 64: ...List of Tables 64 T100S HP User Guide...

Страница 65: ...Interlock SUBD 9 Connector 23 Figure 5 Wavelength scanning process 29 Figure 6 Instrument Setup for Wavelength Monitoring 39 Figure 7 Wavelength Monitoring Scheme 40 Figure 8 Low frequency modulation...

Страница 66: ...List of Figures 66 T100S HP User Guide...

Страница 67: ...trol Enable Disable 32 Input 48 Connections to instruments 22 Constant current mode 34 Constant power mode 34 Current change 36 Current Saturation 47 D DATA area 15 Decrement step 28 Diode current Cha...

Страница 68: ...l mode 17 Optical connectors 55 OUTPUT area 17 Output power Change 33 Verification 52 Outputs 49 P P key 16 P output 18 49 Package 57 Panel Front 15 Rear 18 Parking 26 Pause Timer 14 29 Performance ve...

Страница 69: ...ndex T100S HP User Guide 69 V Valid range 14 Verification 51 W Warning messages 59 Wavelength Change 27 Modulation 48 Monitoring 39 Range verification 52 Sweep 31 Wavemeter use 39 output 18 49 f key 1...

Страница 70: ...Index 70 T100S HP User Guide...

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