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Agilent 83440B/C/D High-Speed Lightwave Converters
DC-6/20/30 GHz, 1000 to 1600 nm
Technical Specifications
Fast optical detector for characterizing lightwave signals
* Fast 15, 22, or 73 ps full-width half-max (FWHM) pulse response * Broad 6, 20, or 30 GHz bandwidth (3 dBopt) * Small, convenient package * Low pulse aberrations * Integral bias regulation * Ideal for high-speed digitizing oscilloscopes Make lightwave measurements with traditional electrical instruments; the Agilent 83440 family offers a high-speed optical interface for oscilloscopes, spectrum analyzers, and network analyzers. With as low as 15 ps FWHM pulse response, the 83440 accurately converts modulated optical waveforms to electrical signals, enabling electrical instruments to measure time domain pulse parameters and frequency domain spectral content. Characterize and optimize laser and optical modulator output performance for fiber optic telecommunications.
Description
The 83440 lightwave converters are fast, accurate, DC-coupled optical-toelectrical (O/E) converters packaged as small optical probes. They mount directly to electrical instrument front panels to simplify integration and minimize distortion and loss from cables, connectors, and signal conditioning components. A simple internal structure ensures very low signal distortion for improved output signal fidelity. By eliminating all unnecessary components along the signal path, the 83440 family offers very accurate electrical representations of modulated optical waveforms. The 83440 family features hermetically sealed, unamplified, InGaAs photodiodes. The input optical port features the Agilent universal optical interface, compatible with most common optical connectors (see Connectors, page 6), while the output electrical port features a precision 3.5 mm (83440B/C) or 2.4 mm (83440D) microwave coaxial connector.
Time Domain Applications
Ideal for high-speed laser and modulator testing, the DC-coupled 83440 family faithfully reproduces incoming optical signals for accurate pulse parameter characterization. Broad bandwidth, nearly Gaussian response characteristics, and low pulse aberrations make these optical detectors an excellent choice for high-speed time domain measurements.
Frequency Domain Applications
The frequency domain allows users to measure, quantify, and model modulated characteristics such as spectral purity, harmonic content, and noise spectral density. The 83440 family allows electrical frequency domain instruments like network and spectrum analyzers to accept optical input signals for basic lightwave measurements.
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Agilent 83440B Specifications and Characteristics
Specifications describe the instrument's warranted performance over the temperature range 0 to 55C (except where noted). Supplemental Characteristics are intended to provide information useful in applying the instrument by giving typical but non-warranted performance parameters. These are denoted as "typical," "nominal," or "approximate."
Typical Response Curves
1 83440B Responsivity vs Wavelength .8 .7 .6 .5 .4 .3 .2 .1 0 850
83440B Uncorrected Pulse System Response 13 0
83440B Frequency Response 0 -1 -3 dB elec
Responsivity (A/W)
Relative voltage
dB electrical
-2 -5 -3 dB opt -3 -4
dBoptical
.5
FWHM 50 ps
1050
1300 Wavelength (nm)
1550 0 -100
-10 0 100 Time (ps) Response of a Agilent 83440B lightwave detector on an Agilent 54124 oscilloscope due to a 2 ps pulsed YAG laser. Frequency Domain 0
-5 3 6 9 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440B and Agilent 54124 oscilloscope.
Time Domain Conversion Gain1,4 (min, into 50 load) 1300 nm: 35 V/W Opt 050: 16.5 V/W 1550 nm: 32.5 V/W 15 V/W
Pulse Width3, 4,10 < 73 ps FWHM6 (calculated:FWHM=0.44/BWopt0.312/BWel) Rise/Fall Time7,10 (10-90%) <80ps (calculated) System Aberrations4,13 (response to 2 ps FWHM pulse) 10% peak-to-peak max, 5% typical Noise5,11 2 W RMS max, equivalent optical noise power Dark Current11 50 nA max, <15 nA typical Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) Maximum Operating Input Optical Power (Compression Point) 2 mW (Peak) +3 dBm (Peak) See saturation chart for pulsed power characteristics Input Optical Reflection8 (HMS-10 optical connector) 0.05% (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 nm
Bandwidth3,4 dc to >6 GHz (-3dB optical)
Relative Electrical Bandwidth
DC Responsivity1,4 (min) 1300 nm 1550 nm 0.70 A/W 0.65 A/W -3.1 dB2 -3.7 dB2 0.33 A/W 0.30 A/W -9.6 dB2 -10.5 dB2
Typical 83440B Saturation Characteristics
1
0.5
Noise Equivalent Power5,11 < 18 pW/ Hz typical 0 0 500 Peak Optical Power (mW) 5 ps pulse width (1060 nm)
Input Optical Return Loss8 (HMS-10 optical connector) >33 dB (1250-1600 nm)
See Notes, page 7
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Agilent 83440C Specifications and Characteristics
Specifications describe the instrument's warranted performance over the temperature range 0 to 55C (except where noted). Supplemental Characteristics are intended to provide information useful in applying the instrument by giving typical but non-warranted performance parameters. These are denoted as "typical," "nominal," or "approximate."
Typical Response Curves
1 83440C Responsivity vs Wavelength .8 .7 .6 .5 .4 .3 .2 .1 0 850
83440C Uncorrected Pulse System Response 13 0
83440C Frequency Response 0 -1 -3 dB elec
Responsivity (A/W)
Relative voltage
dB electrical
-2 -5 -3 dB opt -3 -4
dBoptical
.5
FWHM 20.3 ps
1050
1300 Wavelength (nm)
1550 0 -100
-10 0 0 100 Time (ps) Response of a Agilent 83440C lightwave detector on an Agilent 54124 oscilloscope due to a 2 ps pulsed YAG laser. Frequency Domain
-5 10 20 30 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440C and Agilent 54124 oscilloscope.
Time Domain Conversion Gain1,4 (min, into 50 load) 1300 nm: 35 V/W 1550 nm: 32.5 V/W
DC Responsivity1,4 (min) 1300 nm 1550 nm 0.70 A/W 0.65 A/W -3.1 dB2 -3.7 dB2
opt0.312/BWel)
Typical 83440C Saturation Characteristics
1 Relative Electrical Bandwidth
Pulse Width3, 4,10 < 22 ps FWHM6 (calculated:FWHM=0.44/BW Rise/Fall Time7,10 (10-90%) <24ps (calculated)
Bandwidth3,4 dc to >20 GHz (-3dB optical)
System Aberrations4,13 (response to 2 ps FWHM pulse) 10% peak-to-peak max, 5% typical Noise5,11 3.7 W RMS max, equivalent optical noise power Dark Current11 20 nA max, 3 nA typical Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) Maximum Operating Input Optical Power (Compression Point) 2 mW (Peak) +3 dBm (Peak) See saturation chart for pulsed power characteristics Input Optical Reflection8 (HMS-10 optical connector) 0.05% (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 nm Input Optical Return Loss8 (HMS-10 optical connector) >33 dB (1250-1600 nm) Noise Equivalent Power5,11 < 18 pW/ Hz typical
0.5
0
0
500 Peak Optical Power (mW) 5 ps pulse width (1060 nm)
See Notes, page 7
4
Agilent 83440D Specifications and Characteristics
Specifications describe the instrument's warranted performance over the temperature range 0 to 55C (except where noted). Supplemental Characteristics are intended to provide information useful in applying the instrument by giving typical but non-warranted performance parameters. These are denoted as "typical," "nominal," or "approximate."
Typical Response Curves
1 83440D Responsivity vs Wavelength 0.5
83440D Uncorrected System Pulse Response13
0
83440D Frequency Response 0 -3 dB elec dB electrical -1 dBoptical -2 -5 -3 dB opt -3 -4 -10 0 -5 20 30 40 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440D and Agilent 54124 oscilloscope. 10
Responsivity (A/W)
0.3 0.2 0.1 0 850 1000 1300 Wavelength (nm) 1550
Relative voltage
0.4
.5 FWHM 14.7 ps
0 -50
50 100 Time (ps) Response of a Agilent 83440D lightwave detector on an Agilent 54124 oscilloscope due to a 2 ps pulsed YAG laser. Frequency Domain DC Responsivity1,4 (min) 1300 nm 1550 nm 0.3 A/W 0.3 A/W -8 dB2 -10.5 dB2 Relative Electrical Bandwidth Typical 83440D Saturation Characteristics 1
0
Time Domain Conversion Gain1,4 (min into 50 load) 1300 nm: 20 V/W 1550 nm: 15 V/W
Pulse Width4,10,14 (calculated:FWHM=0.44/BWopt0.312/BWel) Bandwidth4,12,14 < 13 ps FWHM6 dc to 30 GHz nominal (-3dB optical) Rise/Fall Time7,10 (10-90%) <16 ps (calculated) System Aberrations4,13 (response to 2 ps FWHM pulse) 20% peak-to-peak max, <12% typical Noise5,11 8.1 W RMS max, equivalent optical noise power Dark Current11 20 nA max, 4 nA typical Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) Maximum Operating Input Optical Power (Compression Point) 2 mW (Peak) +3 dBm (Peak) See saturation chart for pulsed power characteristics Input Optical Reflection8 (HMS-10 optical connector) 0.10 % (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 nm Input Optical Return Loss8 (HMS-10 optical connector) >30 dB (1250-1600 nm) Noise Equivalent Power5,11 < 18 pW/ Hz typical
0.5
0
0
200 400 Peak Optical Power (mW) 5 ps pulse width (1060 nm)
See Notes, page 7
5
Using the Agilent 83440B/C/D Lightwave Converter
O/E Conversion Process
The 83440 detects the modulated baseband signal from the lightwave carrier, converting it to an electrical signal for processing. The resultant electrical signal can be analyzed in the time domain or frequency domain using electrical oscilloscopes, signal analyzers, and network analyzers. The 83440B/C/D are DC coupled receivers. For proper operation, a DC path to ground is necessary at the RF output. When using the 83440 with an AC-coupled instrument (except opt 050), a bias tee such as the 11612A is required to supply dc bias return path. Alternatively, an attenuator on the output may be used to provide a dc bias return path.
Supplying +15V to the 83440
Depending on the instruments that the Agilent 83440 will be used with, there are several possible configurations to supply the needed +15V bias voltage to the 83440: 86100B: Use the 83440-60004 cable to connect to the +15V supply at the rear of the 86100B Agilent Network Analyzers with Probe Power: Use the 83440-60006 cable to connect to the Probe Power Port of the network analyzer.
87421A Power Supply: Use the 83440-60009 cable in series with the 83440-60004 to connect to the power supply 11899A Probe Power Supply: Use the 83440-60006 cable to connect to the stand-alone probe power supply. General Purpose Variable Power Supply: Use the 83440-60005 cable in series with the 83440-60004 cable.
Physical Characteristics
General
RF Connector ESD Susceptibility at RF Pin9 DC Bias Voltage Power Consumption Weight Operating Temperature Compatible Fiber Photodiode Package Output Impedance Calibration Agilent 83440B/C (3.5 mm [m]) or 83440D (2.4 mm [m]), 50 200 V +10 to +15V dc required < 18 mVA 0.14 kg (0.31 lb) 0-55 deg C 9/125 single mode fiber Hermetically sealed PIN-diode Unterminated (50 terminated for Agilent 83440B Opt 050) Recommended calibration interval is two years.
Mechanical
83440B/C/D
10.5 21 (0.41) (0.83) 15 (0.59) 30 (1.2) 6 (0.24) 16.8 (0.66) 45 (1.8) 8.0 (5/16) across flats
105 0.2 (4.13)
All dimensions in mm (inches). Weight 0.14 kg (0.31 lb) Bias Port All tolerances 0.1 unless otherwise noted Center conductor: +10 to +15 vdc Outer conductor: Common
Connectors
Optical Input: Specify optical input connector option when ordering Agilent 83440B/C/D. 81000 AI Diamond HMS-10 81000FI FC/PC connector 81000 SI DIN 47256 connector 81000 VI ST connector 81000 KI SC connector Electrical Output: 3.5 mm (83440B/C) 2.4 mm (83440D) DC Bias Input: Quick connect (LEMO) bias port ESD Sensitive Parts9 The 83440 features a captive RF connector cap to protect the RF center pin from electrostatic discharge (ESD). Use proper ESD precautions when working with RF and bias ports. Keep RF port capped when not in use.
See Notes, page 7
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Shipping Contents
* One 83440 Lightwave Detector with response data sheet (example shown below) * User specified optical connector adapter * Three dc bias cables (83440-60004, 83440-60005, 83440-60006)
Each 83440 is shipped with instrument-specific frequency response and conversion gain (dc responsivity) data.
83440C
S/N: XXXXAXXXXX Frequency Response Relative to DC
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Ordering Information
Agilent 83440B DC-6 GHz Lightwave Converter 83440B-050, 50 termination for use with SDH/SONET filters Agilent 83440C DC-20 GHz Lightwave Converter Agilent 83440D DC-30 GHz Lightwave Converter
Note: All 83440 orders must specify an optical connector option.
Recommended Accessories
87421A 11899A 8493C-003, 006 11901D 1250-1391 11612A 5952-9654 External 15V fixed power supply External probe power supply 3.5 mm fixed attenuators (3 dB and 6 dB respectively) 2,4 mm (f) to 3.5 mm (m) coax adapter SMB-tee 3.5 mm bias network (45 MHz-26.5 GHz) Fiber Optics Handbook SMB (f) to quick connect (LEMO) SMB (m) to bare wire (ground = black, +15V = clear) 3-pin half-round (f) to quick connect (LEMO) 9-pin D-sub (m) to SMB (m)
DC Bias Cables
83440-60004 83440-60005 83440-60006 83440-60009
Other Agilent O/E Converters
Agilent 11982A Agilent 83410C Agilent 83411A Agilent 83411B Agilent 83412A Agilent 83434A Agilent 83446A/B DC-15 GHz amplified converter. 300 V/W conversion gain. Product Overview lit. no. 5966-1583E. 300 kHz-3 GHz amplified receiver (62.5/125 m fiber). Technical Specifications lit. no. 5988-4308EN. 300 kHz-6 GHz receiver (62.5/125 m fiber). Technical Specifications lit. no. 5988-4308EN. 300 kHz-6 GHz amplified receiver (62.5/125 m fiber). Technical Specifications lit. no. 5988-4308EN. 300 kHz-3 GHz amplified receiver (850 nm) (62.5/125 m fiber). Technical Specifications lit. no. 5988-4308EN. 10 Gb/s lightwave clock and data receiver. Product Overview lit. no. 5968-9251E. 2.4 Gb/s lightwave clock and data receiver. Product Overview lit. no. 5962-1682E.
Notes
1 Stated specs from 83440B/C /D into 50 load. 2 For an O/E device, responsivity (dB) = 20log [ responsivity A/W ] 1 A/W 3 Measured on 8703A lightwave component analyzer. Frequency response verified by deconvolving impulse response of 83440C on 54124 oscilloscope due to a 2 ps pulse YAG laser. 4 See typical performance trace. 5 Thermal noise limited; equivalent optical power limited by 50 input impedance. 6 Full-Width Half-Max. .34 7 Calculated from bandwidth measurements; tr = .48 ,( ) Calculation assumes BWopt BWelec Gaussian pulse. 8 Optical connector limited. 9 ESD susceptibility limited to RF connector center pin. Overall package (other than bias port and RF connector) withstands >25,000 V ESD. 10 Impulse response calculations verified using 2 ps pulsed YAG laser. 11 At room temperature ( 23C 3C) 12 All 83440D units are tested for 30 GHz minimum bandwidth. Measured frequency response data is supplied with each unit. 13 Uncorrected System aberrations include oscilloscope response and source laser aberrations from 2 ps pulsed YAG laser system. Slower pulse width will generate lower aberration levels; high 83440D detector bandwidth can excite 50 GHz oscilloscope response. 14 83440D test system consists of 2-3 ps compressed Nd:YAG laser and 54124 50 GHz digitizing oscilloscope. 83440D frequency response is derived from Fourier transform after correcting for oscilloscope and input pulse frequency response. System verified with YAG heterodyne.
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www.agilent.com/comms/lightwave
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Phone or Fax
United States: (tel) 1 800 452 4844 Canada: (tel) 1 877 894 4414 (fax) (905) 282 6495 China: (tel) 800-810-0189 (fax) 1-0800-650-0121 Europe: (tel) (31 20) 547 2323 (fax) (31 20) 547 2390 Japan: (tel) (81) 426 56 7832 (fax) (81) 426 56 7840 Korea: (tel) (82-2) 2004-5004 (fax)(82-2) 2004-5115 Latin America: (tel) (305) 269 7500 (fax) (305) 269 7599 Taiwan: (tel) 080-004-7866 (fax) (886-2) 2545-6723 Other Asia Pacific Countries: (tel) (65) 375-8100 (fax) (65) 836-0252 Email: tm_asia@agilent.com Product specifications and descriptions in this document subject to change without notice. (c) 1991, 1992, 1996, 2000, 2001, 2002 Agilent Technologies, Inc. Printed in USA August 29, 2002 5988-7788EN

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