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A l l t e s t I n s t r u me n t s , I n c .
5 0 0 C e n t r a l A v e .
F a r mi n g d a l e , N J 0 7 7 2 7
P : ( 7 3 2 ) 9 1 9 - 3 3 3 9
F : ( 7 3 2 ) 9 1 9 - 3 3 3 2
a l l t e s t . n e t
s s a l e s @ a l l t e s t . n e t
T h e t e s t & me a s u r e me n t
e q u i p me n t y o u n e e d a t
t h e p r i c e y o u w a n t .
A l l t e s t c a r r i e s t h e w o r l d ' s l a r g e s t s e l e c t i o n o f
u s e d / r e f u r b i s h e d b e n c h t o p t e s t & me a s u r e me n t
e q u i p me n t a t 5 0 % t h e p r i c e o f n e w .
O O u r e q u i p me n t i s g u a r a n t e e d w o r k i n g , w a r r a n t i e d , a n d
a v a i l a b l e w i t h c e r t i f i e d c a l i b r a t i o n f r o m o u r i n - h o u s e s t a f f
o f t e c h n i c i a n s a n d e n g i n e e r s .
• 1 0 + f u l l t i me t e c h n i c i a n s w i t h o v e r 1 5 0 y e a r s o f
s p e c i a l i z a t i o n
• 9 0 d a y w a r r a n t y & 5 d a y r i g h t o f r e t u r n o n a l l
e q u i p me n t
• • 1 - 3 y e a r w a r r a n t i e s f o r n e w a n d
p r e mi u m- r e f u r b i s h e d e q u i p me n t
• E v e r y u n i t t e s t e d t o O E M s p e c i f i c a t i o n s
• S a t i s f a c t i o n g u a r a n t e e d
Y o u h a v e p l a n s , w e w i l l h e l p y o u a c h i e v e t h e m.
A n y p r o j e c t . A n y b u d g e t .
t
G e t a q u o t e t o d a y !
C C a l l ( 7 3 2 ) 9 1 9 - 3 3 3 9 o r e ma i l s a l e s @a l l t e s t . n e t .
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Related Manuals for Agilent Technologies 11980A
Summary of Contents for Agilent Technologies 11980A
- Page 1 T h e t e s t & me a s u r e me n t e q u i p me n t y o u n e e d a t t h e p r i c e y o u w a n t . A l l t e s t I n s t r u me n t s , I n c .
- Page 2 Agilent 11980A Fiber Optic Interferometer Operation and Service Manual...
- Page 3 ❍ © Copyright material and workmanship for gies shall not be liable for any The OFF symbols Agilent Technologies 2000 a period of one year from date direct, indirect, special, inci- are used to mark the All Rights Reserved. Repro- of shipment.
- Page 4 To prevent electrical shock, do not remove covers. W A R N I N G To prevent electrical shock, disconnect the Agilent 11980A from mains before cleaning. Use a dry cloth or one slightly dampened with water to clean the external case parts. Do not attempt to clean internally.
- Page 5 Measurement accuracy—it’s up to you! Fiber-optic connectors are easily damaged when connected to dirty or damaged cables and accessories. The Agilent 11980A front-panel OPTICAL OUT connector is no excep- tion. When you use improper cleaning and handling techniques, you risk expensive instrument repairs, damaged cables, and compromised measurements.
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Page 6: Table Of Contents
1 General Information Description 1-2 Options 1-3 Initial Inspection 1-4 Returning the Instrument for Service 1-5 Preparing the instrument for shipping 1-5 Agilent Technologies Service Offices 1-8 2 Specifications Specifications 2-2 3 User Precautions Front-Panel Knob 3-2 Connector Care 3-2... - Page 8 Description 1-2 Options 1-3 Initial Inspection 1-4 Returning the Instrument for Service 1-5 Agilent Technologies Service Offices 1-8 General Information...
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Page 9: General Information Description
Description The Agilent 11980A fiber optic interferometer is a Mach Zehnder interferome- ter built with a fixed length of single-mode optical fiber. The Agilent 11980A splits the optical energy into two paths, delaying one path with respect to the other, and recombines them in a second optical coupler. A polarization adjust-... -
Page 10: Options
General Information Options Options Several options are available when ordering the Agilent 11980A. • Option 005 lengthens the delay line from 760 meters to 5.2 kilometers, al- lowing measurement of narrower linewidths. • Options 011 through 015 allow you to order your choice of several optical connector interfaces. -
Page 11: Initial Inspection
1-5. If the shipping container is damaged, or the cushioning material shows signs of stress, notify the carrier as well as the Agilent Technologies office. Refer to “Agilent Technologies Service Offices” on page 1-8. Keep the shipping materials for the carrier’s inspection. Agilent Technologies will arrange for repair or replacement without waiting for a claim settlement. -
Page 12: Returning The Instrument For Service
Technologies Service Offices” on page 1-8 for a list of service offices. Agilent Technologies Instrument Support Center... (800) 403-0801 If the instrument is still under warranty or is covered by an Agilent Technolo- gies maintenance contract, it will be repaired under the terms of the warranty or contract (the warranty is at the front of this manual). - Page 13 They may also cause instrument damage by generating static electricity. 3 Pack the instrument in the original shipping containers. Original materials are available through any Agilent Technologies office. Or, use the following guidelines: • Wrap the instrument in antistatic plastic to reduce the possibility of damage caused by electrostatic discharge.
- Page 14 General Information Returning the Instrument for Service Sealed Air Corporation (Commerce, California 90001). Air Cap looks like a plastic sheet filled with air bubbles. Use the pink (antistatic) Air Cap™ to reduce static electricity. Wrapping the instrument several times in this ma- terial will protect the instrument and prevent it from moving in the carton.
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Page 15: Agilent Technologies Service Offices
General Information Agilent Technologies Service Offices Agilent Technologies Service Offices Before returning an instrument for service, call the Agilent Technologies Instrument Support Center at (800) 403-0801, visit the Test and Measurement Web Sites by Country page at http://www.tm.agilent.com/tmo/country/English/ index.html, or call one of the numbers listed below. - Page 16 Specifications...
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Page 17: Specifications Specifications
Specifications Specifications Table 2-1 lists specifications for the Agilent 11980A. An asterisk (*) placed after an entry indicates that it is a supplemental characteristic. Characteristics are not specifications; they are included as additional information for the user. Table 2-1. Agilent 11980A Specifications Optical Insertion Loss <... -
Page 18: User Precautions
Front-Panel Knob 3-2 Connector Care 3-2 Cleaning Connections for Accurate Measurements 3-3 User Precautions... -
Page 19: Front-Panel Knob
Agilent 11980A is composed of precision-polished single-mode connectors that are easily scratched. Any damage to the optical interface will increase the insertion loss of the Agilent 11980A and damage the connector interfaces. The precautions listed below will help prevent fiber damage and help ensure accurate measurements. -
Page 20: Cleaning Connections For Accurate Measurements
Connectors also vary in the polish, curve, and concentricity of the core within the cladding. Mating one style of cable to another requires an adapter. Agilent Technologies offers adapters for most instruments to allow testing with many different cables. - Page 21 User Precautions Cleaning Connections for Accurate Measurements tions take repeatability uncertainty into account? • Will a connector degrade the return loss too much, or will a fusion splice be re- quired? For example, many DFB lasers cannot operate with reflections from connectors.
- Page 22 0.2 µm. This process, plus the keyed axis, allows very precise core-to-core alignments. This connector is found on most Agilent Technologies lightwave instruments.
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Page 23: Inspecting Connectors
User Precautions Cleaning Connections for Accurate Measurements The soft core, while allowing precise centering, is also the chief liability of the connector. The soft material is easily damaged. Care must be taken to mini- mize excessive scratching and wear. While minor wear is not a problem if the glass face is not affected, scratches or grit can cause the glass fiber to move out of alignment. - Page 24 User Precautions Cleaning Connections for Accurate Measurements Use the following guidelines to achieve the best possible performance when making measurements on a fiber-optic system: • Never use metal or sharp objects to clean a connector and never scrape the connector. •...
- Page 25 User Precautions Cleaning Connections for Accurate Measurements Figure 3-6. Damage from improper cleaning. While these often work well on first insertion, they are great dirt magnets. The oil or gel grabs and holds grit that is then ground into the end of the fiber. Also, some early gels were designed for use with the FC, non-contacting con- nectors, using small glass spheres.
- Page 26 User Precautions Cleaning Connections for Accurate Measurements • Keep connectors covered when not in use. • Use fusion splices on the more permanent critical nodes. Choose the best con- nector possible. Replace connecting cables regularly. Frequently measure the return loss of the connector to check for degradation, and clean every connec- tor, every time.
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Page 27: Cleaning Connectors
Cleaning Connectors The procedures in this section provide the proper steps for cleaning fiber- optic cables and Agilent Technologies universal adapters. The initial cleaning, using the alcohol as a solvent, gently removes any grit and oil. If a caked-on layer of material is still present, (this can happen if the beryllium-copper sides of the ferrule retainer get scraped and deposited on the end of the fiber during insertion of the cable), a second cleaning should be performed. - Page 28 User Precautions Cleaning Connections for Accurate Measurements Table 3-2. Dust Caps Provided with Lightwave Instruments Item Agilent Part Number Laser shutter cap 08145-64521 FC/PC dust cap 08154-44102 Biconic dust cap 08154-44105 DIN dust cap 5040-9364 HMS10/dust cap 5040-9361 ST dust cap 5040-9366 To clean a non-lensed connector C A U T I O N...
- Page 29 To clean an adapter The fiber-optic input and output connectors on many Agilent Technologies instruments employ a universal adapter such as those shown in the following picture. These adapters allow you to connect the instrument to different types of fiber-optic cables.
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Page 30: Operation
Theory of Operation 4-2 Applications 4-3 Static Linewidth Measurement 4-3 Chirp and FM Measurements 4-5 Operation... -
Page 31: Theory Of Operation
After adjusting polarization to achieve maximum signal amplitude (as seen on the electrical spectrum analyzer), the combined beams are cabled to the out- put connector on the Agilent 11980A. This signal can then be analyzed by a lightwave signal analyzer. -
Page 32: Applications
Thus, the standard Agilent 11980A is capable of measuring static laser line- widths down to approximately 250 kHz with its delay of 3.5 µs, while Agilent 11980A Option 005 (with more than 5 km of fiber) can measure line- widths to 32 kHz. Linewidths narrower than these may be measured with larger errors in the displayed linewidth (2π∆ντ... - Page 33 Operation Applications Figure 4-2 illustrates the measurement on a distributed feedback (DFB) laser. The marker function of the Agilent 71400C lightwave signal analyzer is set to the –3 dB (or half power) point of the displayed signal. This frequency corre- sponds to the 3 dB linewidth of the laser.
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Page 34: Chirp And Fm Measurements
Operation Applications Figure 4-2. DFB Linewidth Measurement with Agilent 71400C Chirp and FM Measurements Figure 4-3 shows the experimental setup for chirp or FM measurement. The presence of the gate function allows for the continuous addition of the laser in its modulated and unmodulated states at the optical detector in a lightwave signal analyzer. - Page 35 Operation Applications Figure 4-3. Typical Modulated Laser Power Spectrum Test Setup for Chirp Measurement Figure 4-4. Chirp Under Sinusoidal Modulation (Modulation frequency = 100 MHz)
- Page 36 Operation Applications Figure 4-5 shows the Bessel-function nature of the modulated DFB laser. Null- ing the first or second Bessel sideband-occurring at FM modulation indexes of 2.4 and 3.8, respectively—allow full FM characterization of the single-line laser. Note that the width of each sideband is the linewidth of the laser. Thus, linewidth can be viewed with laser modulation away from the 0 Hz axis.
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Page 38: Operation Verification
Operation Verification 5-2 Optical Insertion Loss Test 5-3 Interferometric Test 5-5 Operation Verification... - Page 39 Operation Verification Operation verification for the Agilent 11980A consists of an optical insertion loss test and an interferometric test. These tests verify the Agilent 11980A's optical integrity. Interferometers with excessive insertion loss may pass the interferometric test. They can still make useful measurements, but will have worse signal-to- noise ratios than interferometers with acceptable insertion loss.
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Page 40: Optical Insertion Loss Test
Operation Verification Operation Verification Optical Insertion Loss Test This test measures the optical insertion loss of the Agilent 11980A at a wave- Description length in its 1250 nm to 1600 nm operating range. Equipment Lightwave source........Agilent 83400A Optical average power meter . - Page 41 2 Set the power meter's wavelength calibration to the appropriate setting. 3 Connect the laser to the power meter via a single-mode fiber cable. Record the optical power. 4 Connect the Agilent 11980A as shown in Figure 5-1. Record the optical power.
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Page 42: Interferometric Test
Interferometric Test This test verifies the existence of two interfering optical paths in the Description Agilent 11980A. Equipment Lightwave signal analyzer ..Agilent 71400C (shown) or Agilent 83810A Lightwave source........Agilent 83400A Synthesized sweeper . - Page 43 Operation Verification Operation Verification Procedure 1 Connect the system as shown in Figure 5-2. 2 Set Agilent 71400C reference level and attenuator to appropriate values. 3 Set the Agilent 71400C controls as follows: Start Frequency ..........12 MHz Stop Frequency.
- Page 44 Operation Verification Operation Verification Figure 5-3. Interferometric Test Measurement...
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Page 46: Replaceable Parts
Replaceable Parts... - Page 47 The Agilent 11980A contains no user-serviceable parts. Opening the inner sheetmetal cover voids your warranty. The label affixed to the inner cover must be left intact in for Agilent Technologies to service your unit; if the label is not intact, any servicing required will not be covered by warranty.