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 Time Domain Applications 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. 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. 2 Agilent 83440B Specifications and Characteristics Specifications describe the instrument’s warranted performance over the temperature range 0 to 55°C (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 83440B Uncorrected Pulse System Response 13 83440B Frequency Response 0 0 1 –1 .5 FWHM 50 ps dB electrical –3 dB elec Relative voltage .8 .7 .6 .5 .4 .3 .2 .1 0 850 –2 –5 –3 dB opt dBoptical Responsivity (A/W) 83440B Responsivity vs Wavelength –3 –4 1050 1300 Wavelength (nm) 1550 –10 0 0 –100 –5 3 6 9 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440B and Agilent 54124 oscilloscope. 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 Conversion Gain1,4 (min, into 50 Ω load) 1300 nm: 35 V/W 1550 nm: 32.5 V/W Opt 050: 16.5 V/W 15 V/W Pulse Width3, 4,10 < 73 ps FWHM6 (calculated:FWHM=0.44/BWopt≈0.312/BWel) 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 Bandwidth3,4 dc to >6 GHz (-3dB optical) 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 µW RMS max, equivalent optical noise power Typical 83440B Saturation Characteristics 1 Relative Electrical Bandwidth Time Domain 0 0.5 Noise Equivalent Power5,11 < 18 pW/ √Hz typical 0 Dark Current11 50 nA max, <15 nA typical Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) 0 500 Peak Optical Power (mW) 5 ps pulse width (1060 nm) 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) Input Optical Return Loss8 (HMS-10 optical connector) >33 dB (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 nm See Notes, page 7 3 Agilent 83440C Specifications and Characteristics Specifications describe the instrument’s warranted performance over the temperature range 0 to 55°C (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 83440C Uncorrected Pulse System Response 13 83440C Frequency Response 0 0 1 –1 .5 FWHM 20.3 ps dB electrical –3 dB elec Relative voltage .8 .7 .6 .5 .4 .3 .2 .1 0 850 –2 –5 –3 dB opt dBoptical Responsivity (A/W) 83440C Responsivity vs Wavelength –3 –4 1050 1300 Wavelength (nm) 1550 –10 0 –5 10 20 30 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440C and Agilent 54124 oscilloscope. 0 –100 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 Conversion Gain1,4 (min, into 50 Ω load) DC Responsivity1,4 (min) 1300 nm 1550 nm 0.70 A/W 0.65 A/W –3.1 dB2 –3.7 dB2 1300 nm: 35 V/W 1550 nm: 32.5 V/W Pulse Width3, 4,10 < 22 ps FWHM6 (calculated:FWHM=0.44/BW opt≈0.312/BWel) Bandwidth3,4 dc to >20 GHz (-3dB optical) Rise/Fall Time7,10 (10-90%) <24ps (calculated) System Aberrations4,13 (response to 2 ps FWHM pulse) 10% peak-to-peak max, 5% typical Noise5,11 3.7 µW RMS max, equivalent optical noise power Noise Equivalent Power5,11 < 18 pW/ √Hz typical Dark Current11 20 nA max, 3 nA typical Typical 83440C Saturation Characteristics 1 Relative Electrical Bandwidth Time Domain 0.5 0 Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) 0 500 Peak Optical Power (mW) 5 ps pulse width (1060 nm) 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) Input Optical Return Loss8 (HMS-10 optical connector) >33 dB (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 nm See Notes, page 7 4 Agilent 83440D Specifications and Characteristics Specifications describe the instrument’s warranted performance over the temperature range 0 to 55°C (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.” 83440D Uncorrected System Pulse Response13 Typical Response Curves 83440D Frequency Response 1 0 0 83440D Responsivity vs Wavelength 0.2 dB electrical Relative voltage .5 1300 Wavelength (nm) –10 0 1550 0 –50 –5 20 30 40 Frequency (GHz) Deconvolved frequency response from 2 ps pulsed YAG laser measured by Agilent 83440D and Agilent 54124 oscilloscope. 10 0 50 100 Time (ps) Response of a Agilent 83440D lightwave detector on an Agilent 54124 oscilloscope due to a 2 ps pulsed YAG laser. Time Domain Frequency Domain Conversion Gain1,4 (min into 50 Ω load) 1300 nm: 20 V/W 1550 nm: 15 V/W DC Responsivity1,4 (min) 1300 nm 1550 nm 0.3 A/W 0.3 A/W –8 dB2 –10.5 dB2 Pulse Width4,10,14 (calculated:FWHM=0.44/BWopt≈0.312/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 µW RMS max, equivalent optical noise power Typical 83440D Saturation Characteristics 1 0.5 Noise Equivalent Power5,11 < 18 pW/ √Hz typical Dark Current11 20 nA max, 4 nA typical 0 Maximum Safe Input Optical Power 10 mW (Peak) +10 dBm (Peak) 0 200 400 Peak Optical Power (mW) 5 ps pulse width (1060 nm) 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) –3 –4 0.1 1000 –3 dB opt FWHM 14.7 ps Relative Electrical Bandwidth Responsivity (A/W) 0.3 –2 –5 dBoptical 0.4 0 850 –1 –3 dB elec 0.5 Input Optical Return Loss8 (HMS-10 optical connector) >30 dB (1250-1600 nm) Wavelength Spectral Response4 1000 nm - 1600 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 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. Agilent Network Analyzers with Probe Power: Use the 83440-60006 cable to connect to the Probe Power Port of the network analyzer. 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]), 50Ω 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 (50Ω terminated for Agilent 83440B Opt 050) Recommended calibration interval is two years. Mechanical 83440B/C/D 45 (1.8) 10.5 21 (0.41) (0.83) 8.0 (5/16) across flats 15 (0.59) 30 (1.2) 6 (0.24) 105 ±0.2 (4.13) 16.8 (0.66) 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 6 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 7 Ordering Information Agilent 83440B DC-6 GHz Lightwave Converter 83440B-050, 50Ω 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 DC Bias Cables 83440-60004 83440-60005 83440-60006 83440-60009 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) Other Agilent O/E Converters Agilent 11982A DC–15 GHz amplified converter. 300 V/W conversion gain. Product Overview lit. no. 5966-1583E. Agilent 83410C 300 kHz–3 GHz amplified receiver (62.5/125 µm fiber). Technical Specifications lit. no. 5988-4308EN. Agilent 83411A 300 kHz–6 GHz receiver (62.5/125 µm fiber). Technical Specifications lit. no. 5988-4308EN. Agilent 83411B 300 kHz–6 GHz amplified receiver (62.5/125 µm fiber). Technical Specifications lit. no. 5988-4308EN. Agilent 83412A 300 kHz–3 GHz amplified receiver (850 nm) (62.5/125 µm fiber). Technical Specifications lit. no. 5988-4308EN. Agilent 83434A 10 Gb/s lightwave clock and data receiver. Product Overview lit. no. 5968-9251E. Agilent 83446A/B 2.4 Gb/s lightwave clock and data receiver. Product Overview lit. no. 5962-1682E. Notes 1 Stated specs from 83440B/C /D into 50Ω 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 Ω 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 ( 23°C ± 3°C) 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. Agilent Technologies’ Test and Measurement Support, Services, and Assistance Agilent Technologies aims to maximize the value you receive, while minimizing your risk and problems. We strive to ensure that you get the test and measurement capabilities you paid for and obtain the support you need. Our extensive support resources and services can help you choose the right Agilent products for your applications and apply them successfully. Every instrument and system we sell has a global warranty. Support is available for at least five years beyond the production life of the product. 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