13

Specifications for optical to optical measurements at 1550 nm

N4374B system with networrk analyzer

E5071C -245

Specifications are valid under the stated measurement conditions and after user calibration with LCA optical output set to

maximum average power (+4 dBm)

At optical input 1 (“+ 7 dBm max”). At optical input 2 (“+ 17 dBm max”), specifications are typically the same for

10 dB higher incident average and modulated optical power.

For wavelength:

(1550 ±20) nm

(option -101, 102).

System performance

10 MHz to 50 MHz

50 MHz to 0.7 GHz

0.7 GHz to 4.5 GHz

Relative frequency

DUT response

≥ -13 dBe

±0.25 dBe, (typ.)

(±0.125 dBo ), (typ.)

±0.25 dBe

(±0.125 dBo)

±0.25 dBe

(±0.125 dBo)

Absolute frequency

DUT response

( ≥-6.5 dBo)

±1.0 dBe typ.

(±0.5 dBo typ.)

±1.0 dBe

(±0.5 dBo)

±1.0 dBe

(±0.65dBo)

Frequency response

DUT response

≥ -13 dBe

±0.02 dBe

±0.02 dBe

±0.02 dBe

Minimum measurable frequency

-76 dBe typ.

(-38 dBo)

-82 dBe

(-41 dBo)

-80 dBe

(-40 dBo )

Phase uncertainty

DUT response

≥ -13 dBe

-

±0.5°

±0.5°

Group delay uncertainty

Derived from phase uncertainty, see section

“Group delay uncertainty”.

Example: ±1.0° → ±8 ps (0.5 GHz aperture)

[f1]

IFBW = 100 Hz.

[f2]

For +4 dBm average output power from LCA optical output.

[f3]

Except phase wrap aliasing (example: a DUT group delay of 5 ns (1 m cable length) requires a frequency step size of ≤ 0.2 GHz to avoid phase wraps).

[f4]

For DUT response maximum +6 dBe ( +3dBo ) gain.

[f5]

Average value over frequency range.

[f6]

After CW responsivity and user calibration with external source.

[f7]

Requires option -101 or -102.

(O/O mode)