9

Specifications for electro-optical measurements at 1550 nm

N4374B system with network analyzer

E5071C -245

Specifications are valid under the stated measurement conditions.

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

response uncertainty

DUT response

±0.5 dBe typ.

±0.7 dBe

(±0.5 dBe typ.)

±0.8 dBe

(±0.6 dBe typ.)

≥ -38 dB(W/A)

±0.5 dBe typ.

±0.5 dBe typ

±0.6 dBe typ.

Absolute frequency

response uncertainty

DUT response

±1.3 dBe typ

±2.2 dBe

(±1.3 dBe typ.)

±2.2 dBe

(±1.3 dBe typ.)

Frequency response

repeatability (typ.)

DUT response

±0.02 dBe

±0.02 dBe

Minimum measurable frequency

-100 dB(W/A) typ.

-103 dB(W/A)

-103 dB(W/A)

Phase uncertainty

DUT response

-

±1.0°

±1.0°

Group delay uncertainty

Derived from phase uncertainty, see section

“Group delay uncertainty”.

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

[f1]

For DUT optical peak output power ≤ +7 dBm.

[f2]

IFBW = 100 Hz.

[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). Excluding a

constant group delay offset of <±0.3 ns typ. (cable length uncertainty < ±0.06 m). A constant group delay offset leads to a phase offset ∆φ = 360° × ∆GD × fmod

(in deg).

[f4]

Average value over frequency range.

(E/O mode)