DEV 7859 & DEV 7860 Optribution Optical Delay Lines

DEV 7859 & DEV 7860 Optribution Optical Delay Lines

The DEV 78xx Optribution Optical Delay Line Series provides precise fixed time-delay compensation for RF over fiber systems. Designed primarily for antenna-diversity applications, these passive optical systems equalize signal-arrival times across fiber paths of different lengths.

The DEV 7859 supports specified delays up to 120 µs in a 3 RU chassis, with an optional extension to 240 µs. The larger DEV 7860 provides delays up to 360 µs in 4 RU, extendable to 480 µs. The required delay must be specified when ordering.

Both models operate from 1310 to 1625 nm over single-mode fiber and provide ±1 µs delay accuracy. SC/APC connectors are standard, with FC/APC and E2000/HRL alternatives available.

Product Type: Fixed optical delay-line system
Series: DEV 78xx
Available Models: DEV 7859 and DEV 7860
Primary Application: Antenna-diversity delay compensation
Fiber Type: Single-mode 9/125 µm
Wavelength Range: 1310-1625 nm
Delay Accuracy: ±1 µs
Standard Optical Connector: SC/APC
Optional Optical Connectors: FC/APC or E2000/HRL
Delay Calculation: 4.9 µs per kilometer of optical fiber
Connector Loss Allowance: 1 dB total, or 0.5 dB per connector
Chassis Width: 483 mm, 19-inch
Weight: 7-22 kg, depending on delay configuration
Environmental Conditions: ETS 300019 Part 1-3 Class 3.1E

Available Models

• DEV 7859: 3 RU optical delay line providing a specified delay up to 120 µs, optionally extendable to 240 µs.

• DEV 7860: 4 RU optical delay line providing a specified delay up to 360 µs, optionally extendable to 480 µs.

Optical Attenuation

• At 1310 nm: Less than 0.35 dB/km
• At 1550 nm: Less than 0.20 dB/km
• At 1625 nm: Less than 0.23 dB/km

The stated fiber attenuation excludes connector loss. Add 1 dB for the two optical connectors when calculating total system attenuation.

Chassis Specifications

DEV 7859

• Standard Maximum Delay: 120 µs
• Optional Maximum Delay: 240 µs with Option 67
• Chassis Height: 3 RU, 133 mm
• Chassis Depth: 495 mm

DEV 7860

• Standard Maximum Delay: 360 µs
• Optional Maximum Delay: 480 µs with Option 68
• Chassis Height: 4 RU, 178 mm
• Chassis Depth: 631 mm

Available Options

• Option 67: Extends the DEV 7859 delay range from 120 to 240 µs

• Option 68: Extends the DEV 7860 delay range from 360 to 480 µs

• Option 07: FC/APC optical connectors

• Option 08: E2000/HRL optical connectors

• The exact required time delay must be specified when ordering

Key Features

• Precise optical time-delay compensation

• Optimized for antenna-diversity systems

• Fixed delay configured for each application

• Delay ranges up to 480 µs

• ±1 µs delay accuracy

• Low optical attenuation

• Wide 1310-1625 nm wavelength coverage

• Single-mode fiber construction

• Standard SC/APC optical connectors

• Optional FC/APC and E2000/HRL connectors

• 19-inch rack-mount chassis

• 3 RU and 4 RU configurations

• Passive optical operation