Related Manuals for Bookham New Focus 2307
Summary of Contents for Bookham New Focus 2307
- Page 1 sales@artisantg.com artisantg.com (217) 352-9330 | Visit our website - Click HERE...
- Page 2 U S E R ’ S G U I D E Large-Area Balanced Photoreceivers Models 2307 & 2317 2584 Junction Ave. • San Jose, CA 95134-1902 • USA phone: (408) 919–1500 • e-mail: contact@newfocus.com • www.newfocus.com...
- Page 3 NEW FOCUS, Inc. are trademarks or registered trademarks of Bookham Technology plc in the U.S.A or other countries. Products described in this document may be covered by one or more patents in the U.S.A. and abroad.
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Page 4: Table Of Contents
Contents Operation Introduction ......... . . 5 Using the Photoreceiver. - Page 5 4 • Contents NEW FOCUS, Inc.
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Page 6: Operation
Operation Introduction The Model 23X7 is a general-purpose balanced photoreceiver with a large-area photodetector. These receivers can be powered by battery or by an external ± 15-V power supply. There are two versions of the Model 23X7 receiver, each based on a different photodetector: Model Wavelength... - Page 7 Figure 1: Typical Model 2317 responsivities of the Model 2307 & 2317 photodiodes Model 2307 1000 1200 1400 1600 1800 2000 Wavelength, nm For more information on frequency response and noise, see Note: Note: page 11. The photoreceiver’s slim casing, shown on the next page, makes it easy to position it in a set-up between closely spaced optics.
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Page 8: Using The Photoreceiver
Using the Photoreceiver 1. Check the battery voltage. The Model 23X7 can be powered by a single 9-volt alkaline battery or an external power supply. If you are using a battery, check the battery condition by pushing the red power switch to the BATT CHK position. If the green LED lights up, the battery is in good condi- tion;... -
Page 9: Checking The Battery
adjust their relative intensity until the balanced output is zero volts. 8. Turn the receiver off. When you are finished with the receiver, return the power switch to the “off” position. Checking the Battery The Model 23X7 is powered by a single, standard 9-volt alkaline battery. -
Page 10: General Features & Principles
General Features & Principles Photoreceiver Circuitry The circuitry inside the Model 23X7 consists of two photodiodes followed by an electronic gain stage. The black switch on top of the casing allows you to select one of three gain settings: low (2x10 V/A), medium V/A), and high (2x10 V/A). -
Page 11: Optical Power And Output Voltage
Optical Power and Output Voltage The typical operating range for these receivers is from a few nanowatts up to 2 to 5 mW (depending the model and gain setting). Be careful to keep the differential optical power under the maximum optical power difference of 10 mW to avoid damaging the photodetector. -
Page 12: Frequency Response And Noise
Frequency Response and Noise Measuring Bandwidth The frequency response and noise characteristics of the large-area photoreceiver depend on the selected gain. The figures beginning on page 15 give the typical frequency response and noise behavior for the photoreceivers at each of the three gain settings—low, medium, and high. - Page 13 Another way to characterize the noise is with the photocurrent noise (I ), which is related to NEP by = R · NEP, where R is the photodetector’s responsivity. The photocurrent noise is independent of wavelength because it gives the photoreceiver’s noise with the photodetector’s responsivity factored out.
- Page 14 You can further improve your signal-to-noise ratio by using electrical filters or optical modulators or choppers with lock-in amplifiers to limit the detection bandwidth. Calculating Output-Voltage Noise The output-voltage noise can be calculated from G · R · NEP · where G is the transimpedance gain (V/A), R is the photodiode responsivity (A/W), NEP is the average noise equivalent power, and BW is the bandwidth.
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Page 15: Typical Frequency Response And Noise Spectra
bandwidth. By using an electronic band-pass filter or an optical chopper and a lock-in amplifier, the receiver can detect significantly weaker optical signals. Typical Frequency Response and Noise Spectra The 3-dB frequency bandwidth is defined as the frequency where the photoreceiver’s transimpedance gain has decreased by a factor of . - Page 16 For the Model 2307 on the low setting the gain is 2x10 V/A and the bandwidth is 1 MHz. The gain on the medium setting is 10 V/A, and the bandwidth is 200 kHz. The gain on the high setting is 2x10 V/A, and the bandwidth is 150 kHz.
- Page 17 For the Model 2317 the bandwidth exceeds 150 kHz (250 kHz for the unit pictured in Figure 5) for the low gain setting, 30 kHz for the medium gain setting, and 30 kHz for the high gain setting. Figure 5: Model 2317, Low Gain Setting Typical 1.00E-07...
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Page 18: Common Mode Rejection
Common Mode Rejection Using the Model 23X7 balanced photoreceivers with equal signal powers on each photodiode results in an output with reduced common mode signal. The common-mode rejection ratio, or CMRR, is a measurement of the effectiveness of the balanced subtraction. -
Page 19: Using Filters And Optical Fiber
Using Filters and Optical Fiber New Focus offers accessories to attach a 1"-diameter filter or an optical fiber to the Model 23X7 large-area photoreceiver. These accessories are sold separately, and they are not supplied with the photoreceiver. Both accessories attach to the photoreceiver using the 1.04- 32 threads located in the casing around the photo- detector. - Page 20 Figure 7: holes for tightening Model 1280 Retaining ring 1.04-32 for holding 1" filter holder thread or 25-mm optics. Model 1281 FC-fiber adapter 6-32 nylon-tipped dia. 1.30" setscrew for (33.0) holding 1" or 25-mm optics. Model 1280 patent pending 1.04-32 thread holes for tightening...
- Page 21 20 • Using Filters and Optical Fiber NEW FOCUS, Inc.
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Page 22: Characteristics
Characteristics Physical Specifications Figure 8: 2.50" (63.5) Mechanical 1.16" (29.5) drawing of the battery check LED Model 23X7 output BNC casing gain-setting switch power switch photodetectors external 4.06" input power 2x 1.040-32 THD (103.1) (15 VDC) for mounting Model 1280 Filter Holders and Model 1281 FC Fiber Adapters (not included) 1.00"... -
Page 23: Model 2307 Specifications
Model 2307 Specifications Model 2307 Wavelength Range 400–1070 nm 3-dB Bandwidth 1 MHz, 200 kHz, 150 kHz Typical Common-Mode Rejection 40 dB Rise Time 500 ns Peak Conversion Gain 1.2 x 10 Typical Max. Responsivity 0.6 A/W Max. Transimpedance Gain 2 x 10 , 10 , 2 x 10... -
Page 24: Model 2317 Specifications
Model 2317 Specifications Model 2317 Wavelength Range 800–1750 nm 3-dB Bandwidth 150 kHz, 30 kHz, 30 kHz Typical Common-Mode Rejection 40 dB Rise Time 3.3 µs Peak Conversion Gain 1.6 x 10 Typical Max. Responsivity 0.8 A/W Max. Transimpedance Gain 2 x 10 , 10 , 2 x 10... -
Page 25: Customer Service
Customer Service Technical Support Information and advice about the operation of any New Focus product is available from our applications engineers. For quickest response, ask for “Technical Support” and know the model and serial numbers for your product. Hours: 8:00–5:00 PST, Monday through Friday (excluding holidays).
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