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DATASHEET| AUGUST 6, 2008
EMCORE CORPORATION
Model 755M Optical Transmitter
755M, Noise and Distortion Characteristics for CATV Input
CATV 75
Input Option
RF Level/ch
(dBmV)
Composite
(dBm)
BER (5)
CNR (1,2)
(dB)
CSO (1,3,6)
(dBc)
CTB (1,3,6)
(dBc)
79ch NTSC (4)
15
-14.77
-
51
-60
-65
79ch NTSC + 75ch QAM @ -6dB (4)
79ch = 15
75ch QAM = 9
-13.84
10-7
49
-60
-65
110ch NTSC (4)
13.57
-14.77
-
48.5
-60
-65
42ch CENELEC (4)
17.75
-14.77
-
52
-60
-65
60ch PAL (4)
16.2
-14.77
-
52
-60
-65
JCTEA: 57ch Analog + 40ch QAM @ -10dB (7)
57ch = 16.2
40ch QAM = 6.2
-14.70
-
46
-60
-65
JCTEA: 11ch + 80ch QAM @ -10dB (8)
11ch = 21.2
80ch QAM = 11.2
-14.76
-
46
-60
-65
1. Test with 3m and 20km of SMF28 fiber.
2. CNR may degrade up to 0.5dB over the operating temperature range.
3.
CSO and CTB may degrade up to 1.5dB over the temperature range.
4. Test with 0 dBm received optical power.
5. QAM format = 256-QAM, ITU-T J.83 Annex C, Analog channels are modulated.
6. L-band input is injected with 2 tones, F1 = 2000MHz, F2 = 2000.5MHz with –3dBm/tone.
7. Test with EDFA, –6dBm received optical power, QAM format = 64-QAM. 2 tones, F1 = 2000MHz, F2 = 2000.5MHz,
applied to L-Band port with –3dB/tone. 18dBm launch power.
8. Test with EDFA, –8dBm received optical power, QAM format = 64-QAM. 2 tones, F1 = 2000MHz, F2 = 2000.5MHz,
applied to L-Band port with –3dB/tone. 18dBm launch power.