7

Receiver Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Reference

Input Optical Power

–17

0

dBm avg.

7

Stressed Receiver Sensitivity

62.5

µm

–12.5

dBm avg.

8

50

µm

–13.5

dBm avg.

8

Stressed Receiver Eye

201

ps

6, 9

Opening at TP4

Receive Electrical 3 dB

1500

MHz

10

Upper Cutoff Frequency

Operating Center Wavelength

770

860

nm

Return Loss

12

dB

11

Signal Detect – Asserted

–17

dBm avg.

12

Signal Detect – Deasserted

–30

dBm avg.

12

Signal Detect – Hysteresis

1.5

dB

12

Notes:

1. The maximum Optical Output Power complies with the IEEE 802.3z specification, and is class 1 laser eye safe.

2. Optical Extinction Ratio is defined as the ratio of the average optical power of the transmitter in the high (“1”) state to the low (“0”) state. Ex-

tinction Ratio shall be measured using the methods specified in TIA/EIA.526.4A. This measurement may be made with the node transmitting

a 36A.3 data pattern. The Saturation Ratio is measured under fully modulated conditions with worst case reflections. A36A.3 data pattern is a

repeating K28.7 data pattern, which generates a 125 mHz square wave.

3. These are unfiltered 20-80% values.

4. Laser transmitter pulse response characteristics are specified by an eye diagram (Figure 1). The characteristics include rise time, fall time,

pulse overshoot, pulse undershoot, and ringing, all of which are controlled to prevent excessive degradation of the receiver sensitivity. These

parameters are specified by the referenced Gigabit Ethernet eye diagram using the required filter. The output optical waveform complies with

the requirements of the eye mask discussed in section 38.6.5 and Fig. 38-2 of IEEE 802.3z.

5. CPR is measured in accordance with EIA/TIA-526-14A as referenced in 802.3z, section 38.6.10.

6. TP refers to the compliance point specified in 802.3z, section 38.2.1.

7. The receive sensitivity is measured using a worst case extinction ratio penalty while sampling at the center of the eye.

8. The stressed receiver sensitivity is measured using the conformance test signal defined in 802.3z, section 38.6.11. The conformance test signal

is conditioned by applying deterministic jitter and intersymbol interference.

9. The stressed receiver jitter is measured using the conformance test signal defined in 802.3z, section 38.6.11 and set to an average optical

power 0.5 dB greater than the specified stressed receiver sensitivity.

10. The 3 dB electrical bandwidth of the receiver is measured using the technique outlined in 802.3z, section 38.6.12.

11. Return loss is defined as the minimum attenuation (dB) of received optical power for energy reflected back into the optical fiber.

12. With valid 8B/10B encoded data.

HFBR-53A5VEMZ/FMZ, 850 nm VCSEL

Transmitter Optical Characteristics

Parameter

Symbol

Min.

Typ.

Max.

Unit

Reference

Output Optical Power

–9.5

–4

dBm avg.

1

50/125 µm, NA = 0.20 Fiber

Output Optical Power

–9.5

–4

dBm avg.

1

62.5/125 µm, NA = 0.275 Fiber

Optical Extinction Ratio

9

dB

2

Center Wavelength

830

850

860

nm

Spectral Width – rms

σ

0.85

nm rms

Optical Rise/Fall Time

0.26

ns

3, 4, Figure 1

–117

dB/Hz

Coupled Power Ratio

CPR

9

dB

5

Total Transmitter Jitter

227

ps

6

Added at TP2