HP 71451B Optical Spectrum Analyzer

With its unique operating modes, the HP 71451B is the one OSA that can fully characterize your optical devices. In addition to optical sources, the HP 71451B can characterize optical-to-optical devices such as couplers, filters, isolators, switches, and wavelength division multiplexers. Through the use of the transimpedence input, the HP 71451B can also measure the responsivity of your photo diodes as a function of wavelength.

The HP 71451B measures insertion loss, filter bandwidths, cross talk, and (with Option 003) polarization dependent loss of optical-to-optical components, as a function of wavelength. By accessing the transimpedence input, found only on the HP 71451B, the electrical output of your photo diodes can be measured, as a function of wavelength, to determine their responsivity. Use the optional programmable current source to bias your photo diodes and characterize the responsivity as a function of bias current.

The combination of monochromator output and photo diode input, as found only on the HP 71451B, allows you to filter a broadband light source before applying it to your active device under test. The filtered light is swept so that all wavelengths of interest are evaluated without overloading your device and causing it to behave non-linear. The monochromator output allows the OSA to selectively preselect the optical source signal by giving the user full control over wavelength position, resolution bandwidth, and sweep speed, while preserving the input signal's state of polarization.

[ Features ]

Monochromator output
Photodetector input
Transimpedence input
Optional swept polarization dependent loss (PDL) kit (Opt. 003)

[ Specifications ]

Wavelength
	Absolute accuracy [1] (after user cal)			±0.3 nm

Amplitude
	Scale fidelity [5]
		autorange off (sample detector)			±0.1 dB
		autorange on (sample detector)			±0.2 dB

	Polarization dependence [1,6]
		1250 - 1600 nm [1]				±0.5 dB
		 750 - 1600 nm [2]				±1.5 dB
		 600 - 1700 nm [2]				±2.5 dB

        Sensitivity [4]
	        1200 - 1600 nm					-90 dBm

        Dynamic Range [1],[8]
	        1250 - 1600 nm Chop Mode on			-70 dB > ą0.5 nm
	        1250 - 1600 nm Chop Mode off			-55 dB > ą0.5 nm
							        -60 dB > ą1 nm
	


Monochromator Output (into 62.5 µm fiber)
	Polarization dependence, for resolutions >=0.2 nm
		1250 - 1600 nm					±0.5 dB[3]
		700 - 1600 nm[2]				±1.5 dB
		600 - 1700 nm [2]				±2.5 dB
	Resolution selections (FWHM)				0.08 nm and 0.1 to 10 nm
								in a 1,2,5 sequence
	Resolution accuracy for >=0.5 nm, 1250-1600 nm	        ±20%

Photodetector Input (in power meter mode)
	Accuracy at -30 dBm [1,2](ref to 1300 nm)
		20°C to 30°C			                ±0.25 dB
		0°C to 55°C			                ±0.4 dB
	Maximum safe power level				+20 dBm
	1 dB compression level					>=+7 dBm
	Scale fidelity for <=2 dBm inputs[5]
       	for any measurement with fixed reference level		±0.1 dB
	for multiple measurements with different 
	reference levels					±0.2 dB
	Display resolution
		log						0.01 dB
		linear						0.23% of measurement
								+0.01% of reference level
Transimpedance Input
	Current range						0 to -10 mA
	Maximum current						±10 mA
	Maximum voltage						±10 V



Weight:				                                28 kg (61.6 lb)

Dimensions: (H x W x D)		                                222 x 425.4 x 526 mm
					                        8.75 x 16.75 x 20.7 in


[1]	With applied input fiber 9/125 µm
[2]	Characteristic
[3]	Temperature range 20° to 30°C
[4]	Signal value >6 times the RMS noise value
[5]	  to within 15 dB of the sensitivity noise limit
[6]	  for resolutions >0.2 nm
[7]	Calculated from specified values; 1.15 x RSS of polarization sensitivity,
        scale fidelity,RBW accuracy.
[8]     In a 0.1nm resolution bandwidth

[ Ordering ]

HP 71451B Optical Spectrum Analyzer Opt 001 Built-in programmable current source Opt 002 Built-in white light source Opt 003 Swept Polarization Dependent Loss Kit Opt 010 Delete FC/PC interface Opt 051 EDFA Interpolation Program Opt 052 EDFA Time Domain Extinction Program Opt 053 EDFA Gain Peak Measurement Program Opt 0B1 Add manual set Opt 0B3 Service manual Opt ABJ Japan - Japanese localization Opt UK6 Commercial calibration certificate w/ test data

[ Key Literature ]

HP 71450B, 71451B, 71452B Optical Spectrum Analyzers ( PDF)
Optical Spectrum Analysis Basics ( PDF)

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[ Assistance ]

To help you make the right product choices

Local Sales Office

[ Related ]

Related product families available online:

Optical Spectrum Analyzers