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Newport NIRVANA User Manual
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Newport NIRVANA User Manual

High speed auto-balanced photoreceiver
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USER'S GUIDE
High Speed auto-balanced
Photoreceiver
1837 GHz – NIRVANA
These photodetectors are sensitive to electrostatic
discharges and could be permanently damaged if
subjected even to small discharges. Ground your-
self adequately prior to handling these detectors
or making connections. A ground strap provides
the most effective grounding and minimizes the
likelihood of electrostatic damage
1
phone: (877) 835-9620
e-mail: tech@newport.com •
www.newport.com

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Summary of Contents for Newport NIRVANA

  • Page 1 USER’S GUIDE 1837 GHz – NIRVANA High Speed auto-balanced Photoreceiver These photodetectors are sensitive to electrostatic discharges and could be permanently damaged if subjected even to small discharges. Ground your- self adequately prior to handling these detectors or making connections. A ground strap provides...

  • Page 2: Table Of Contents

    Customer Service Warranty Newport Corporation guarantees its products to be free of defects for one year from the date of shipment. This is in lieu of all other guarantees, expressed or implied, and does not cover incidental or consequential loss. Information in this document is subject to change without notice.

  • Page 3: Overview

    To eliminate the problems associated with manually balancing the reference and signal beams the GHz Nirvana 1837 is an auto-balanced photoreceiver with a built-in low-frequency feedback loop that controls the electronic gain of one of the receivers and maintains automatic balance between signal and...

  • Page 4: Quick Start

    1. Use one of the supplied power cables to connect the photoreceiver to a 15-volt power source that can supply 200 mA. For the Newport Model 0901 power supply, use the 3-pin connector-to-3-pin connector cable. For other power supplies, use the 3-pin connector-to banana plug power cable.

  • Page 5: General Principles

    General Principles The Newport Model 1837 auto-balanced photoreceiver consists of two photodiodes followed by RF amplifiers that generate an output voltage proportional to G 1 ·I 1 – G 2 ·I 2 . G 1 is a fixed transimpedance while gain G 2 is automatically controlled or manually adjusted to reject common mode.
  • Page 6 Low-frequency Monitor Outputs In addition to the RF output, the balanced photoreceiver has two low-frequency monitor outputs, M1 and M2. These monitor outputs can be used to help align light onto the photodiodes and to perform low frequency diagnostics. The monitor outputs have SMB connectors, and an SMB-to-BNC cable is provided with the photoreceiver.
  • Page 7 Gain, Bandwidth and Noise The RF amplifiers in Figure 1 present typical AC coupled gains of G and G and amplify photodiodes currents I and I is fixed to typically 40 000 Volts/Amp AC and G can be automatically or manually set to values larger or smaller than G .
  • Page 8 Fig 5 – Input Noise Equivalent Power (NEP) referred to the either INPUT 1, 2 of 1837 for MANUAL mode to 1GHz.
  • Page 9 auto-balanced and Manual Balanced Modes When in auto-balanced Mode (switch to AUTOBAL) 1837 Photoreceiver has a patent pending control logic ( Fig 1) that detects signals on Input 1 and Input 2 in the range 30KHz to 1MHz (common mode). By computing the ratio between them it automatically generates a voltage V to control G and equalize ·I...

  • Page 10: Operation

    Use the Model 0924 3-pin connector-to-banana plug power cable when working with a power supply other than the Newport Model 0901. Be sure to hook up the banana plugs correctly, or the photoreceiver can be damaged. The convention for the three banana plugs is as follows: Red = +15 V, Green = Ground.
  • Page 11 Mounting the Photoreceiver Figure 2: Mechanical drawing of the balanced photoreceiver The bottom of the photoreceiver has two pairs of holes for mounting it to a post or pedestal. The pair labeled “M” is for mounting with M4-threaded screws. The other pair is threaded for 8-32-threaded screws.
  • Page 12 Connecting the Optical Inputs When connecting the optical inputs, keep the power below the saturation power listed in Table 1. This will keep the RF amplifier operating in the linear region. The optical power must remain below the absolute maximum power listed in the Table 1.

  • Page 13: Specifications

    M1, M2 - monitor DC gain @ load = 1 MΩ 1 000 M1, M2 - monitor 3dB Bandwidth M1, M2 - Electrical Output Voltage + 14 + 15 + 16 Current Connector 3-pin picostyle Temperature °C Humidity, non condensing Table I – Newport 1837 Technical Specifications...

  • Page 14: Customer Service

    Customer Service Technical Support Information and advice about the operation of any Newport product is available from our applications engineers. For quickest response, ask for “Technical Support” and know the model number and serial number for your product. Hours: 8:00–5:00 PST, Monday through Friday (excluding holidays).