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High-Speed Detectors and Receivers

High-Speed Detectors and Receivers

Product catalog summary

Introduction
This document provides technical insights into high-speed photodetectors used for pulsed-laser measurements, focusing on models 1444, 1454, and 1024. It addresses key considerations such as optical saturation levels, measurement offsets, and the impact of instrument bandwidths on measurement fidelity.

Specifications and Considerations

Optical Saturation: Determined by the continuous wave input saturation power multiplied by the gain. For short pulses, the output pulse width equals the full width at half maximum (FWHM) of the photoreceiver’s impulse response.
Offsets: Offsets from oscilloscopes or DC-coupled photoreceivers can skew results. It is crucial to subtract these offsets by measuring the average background signal level before pulse arrival.

Instrument Bandwidths
All system components must have a bandwidth greater than the 3-dB bandwidth of the signal to ensure accurate measurements. The document provides a formula for estimating the FWHM of a pulse when using different instruments, emphasizing the importance of considering the bandwidths of cables, connectors, and laser jitter.

Testing Methods

Frequency Domain: Photodetectors are tested using a heterodyne configuration with two laser beams to generate a beat signal, allowing for frequency response measurements up to 90 GHz.
Time Domain: Each photodetector is tested with a 50-GHz oscilloscope and a 1550-nm pulsed fiber laser, frequency doubled to 775 nm for GaAs-based products.

Product Features
New Focus photoreceivers are suitable for fast, accurate waveform measurements across wavelengths from 450–1630 nm. They feature multimode fiber inputs, DC-bias monitors, and switchable DC- or AC-coupled outputs.

Applications
These photoreceivers are ideal for characterizing high-speed components, including BER testing, generating eye diagrams, and conducting heterodyne experiments. They are also used for precision timing and triggering in optical systems.

Repair and Maintenance
Common repair reasons include electrostatic damage and excessive optical power, requiring diode replacement and retesting. The document emphasizes minimizing repair time to support ongoing experiments.

Conclusion
New Focus high-speed photodetectors are meticulously crafted and tested to ensure high performance in both frequency and time domains, making them essential tools for advanced optical measurements.

Overview
The document provides detailed specifications and features of various high-speed photodetectors, focusing on their applications, performance metrics, and pricing. These photodetectors are designed for ultrahigh-speed measurements and are suitable for both frequency-domain and time-domain applications.

Specifications

Models: Discusses models including 1480-S, 1481-S, 143X, 141X, 1004, 1014, 1444, 1454, and 1024.
Frequency Response: Models like 1480-S and 1481-S show a typical frequency response up to 45 GHz, while others like 1024 are optimized for time-domain applications with a 12-ps impulse response.
Responsivity: Varies across models, with typical values ranging from 0.2 A/W to 0.6 A/W depending on the wavelength and model.
Power Requirements: All models are powered by an internal 9-V battery, ensuring portability and ease of use.
Optical and Electrical Inputs: Accept fiber-coupled optical inputs and provide electrical outputs via Wiltron® K Connectors.

Applications

Characterizing frequency response of pulsed lasers, modulators, and transmitters.
Microwave generation and heterodyne experiments.
Characterizing pulse propagation through dispersive optical systems.

Features

High sensitivity and flat frequency response up to 45 GHz.
Self-contained modules with built-in bias circuits and photocurrent monitors.
Elimination of lossy high-frequency coaxial cables due to fiber-optic inputs.
DC-bias monitor with a transimpedance gain of 1 mV/µA and a 50-kHz bandwidth.

Pricing

Base prices range from $3,800 to $6,500 depending on the model.
Extended warranties are available for an additional cost.
International pricing requires an additional 10%.

Recommendations For applications requiring fast time resolution, models like 1024 with a 12-ps impulse response are recommended. For frequency-domain applications, models with a flat response up to 45 GHz are ideal.

Catalog excerpts

Power: internal 9-V battery Optical Input: fiber-coupled input prevents signal distortion Bias Monitor: amplifies the DCphotocurrent and eliminates theneed for expensivebias tees >

Open the catalog to page 15

Power: internal9-V battery Optical Input: fiber-coupled input prevents signal distortion Bias Monitor: amplifies the DCphotocurrent and eliminates theneed for expensivebias tees Application Note Available Application Note 1: Insightsinto High-Speed Detectors andHigh-Frequency TechniquesӔpage 382 >

Open the catalog to page 17

High-Speed Detectors and Receivers

High-Speed Detectors and Receivers

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