 |
Electronic Components Datasheet Search |
|
|
Electronic Components Datasheet Search |
|
HFCT-5208AM Datasheet(PDF) 2 Page - AVAGO TECHNOLOGIES LIMITED |
|
||||||||||||||||||||||||||||||
HFCT-5208AM Datasheet(HTML) 2 Page - AVAGO TECHNOLOGIES LIMITED |
|
|
2 / 20 page  2 Figure 1. Relative Input Optical Power -dBm Average. 10-2 10-3 10-4 10-5 10-6 10-7 10-8 10-9 10-10 10-11 10-12 10-13 10-14 10-15 -5 LINEAR EXTRAPOLATION OF 10-4 THROUGH 10-7 DATA ACTUAL DATA -4 -3 -2 -1 0 12 3 Transmitter Section The transmitter section of the HFBR-5208M consists of a 1300 nm LED in an optical subassembly (OSA) which mates to the multimode fiber cable. The HFCT-5208M incorporates a 1300 nm Fabry Perot (FP) laser in the optical subassembly. In addition, this package has been designed to be compliant with IEC 825 eye-safety requirements under any single fault condition. The OSA’s are driven by a custom, silicon bipolar IC which converts differential PECL logic signals (ECL referenced to a +5 V supply) into an analog LED/laser drive current. Receiver Section The receiver contains an InGaAs PIN photodiode mounted together with a custom, silicon bipolar transimpedance preamplifier IC in an OSA. This OSA is mated to a custom, silicon bipolar circuit providing post amplification and quantization and optical signal detection. The custom, silicon bipolar circuit includes a Signal Detect circuit which provides a PECL logic high state output upon detection of a usable input optical signal level. This single- ended PECL output is designed to drive a standard PECL input through normal 50 Ω PECL load. Applications Information Typical BER Performance of HFBR-5208M Receiver versus Input Optical Power Level The HFBR/HFCT-5208M transceiver can be operated at Bit-Error-Ratio conditions other than the required BER = 1 x 10-10 of the 622 MBd ATM Forum 622.08 Mb/s Physical Layer Standard and the ANSI T1.646a. The typical trade-off of BER versus Relative Input Optical Power is shown in Figure 1. The Relative Input Optical Power in dB is referenced to the Input Optical Power parameter value in the Receiver Optical Characteristics table. For better BER condition than 1 x 10-10, more input signal is needed (+dB). For example, to operate the HFBR-5208M at a BER of 1 x 10-12, the receiver will require an input signal approximately 0.6 dB higher than the -26 dBm level required for 1 x 10-10 operation, i.e. -25.4 dBm. An informative graph of a typical, short fiber transceiver link per-formance can be seen in Figure 2. This figure is useful for designing short reach links with time-based jitter requirements. This figure indicates Relative Input Optical Power versus Sampling Time Position within the receiver output data eye-opening. The given curves are at a constant bit-error-ratio (BER) of 10-10 for four different signaling rates, 155 MBd, 311 MBd, 622 MBd and 650 MBd. These curves, called “tub” diagrams for their shape, show the amount of data eye-opening time-width for various receiver input optical power levels. A wider data eye- opening provides more time for the clock recovery circuit to operate within without creating errors. The deeper the tub is indicates less input optical power is needed to operate the receiver at the same BER condition. Generally, the wider and deeper the tub is the better. The Relative Input Optical Power amount (dB) is referenced to the absolute level (dBm avg.) given in the Receiver Optical Characteristics table. The 0 ns sampling time position for this Figure 2 refers to the center of the Baud interval for the particular signaling rate. The Baud interval is the reciprocal of the signaling rate in MBd. For example, at 622 MBd the Baud interval is 1.61 ns, at 155 MBd the Baud interval is 6.45 ns. Test conditions for this tub diagram are listed in Figure 2. The HFBR/HFCT-5208M receiver input optical power requirements vary slightly over the signaling rate range of 20 MBd to 700 MBd for a constant bit-error-ratio (BER) of 10-10 condition. Figure 3 illustrates the typical receiver relative input optical power varies by <0.7 dB over this full range. This small sensitivity variation allows the optical budget to remain nearly constant for designs that make use of the broad signaling rate range of the HFBR/HFCT-5208M. The curve has been normalized to the input optical power level (dBm avg.) of the receiver for 622 MBd at center of the Baud interval with a BER of 10-10. The data patterns that can be used at these signaling rates should be, on average, balanced duty factor of 50%. Momentary excursions of less or more data duty factor than 50% can occur, but the overall data pattern must remain balanced. Unbalanced data duty factor will cause excessive pulse-width distortion, or worse, bit errors. The test conditions are listed in Figure 3. |
Similar Part No. - HFCT-5208AM |
|
Similar Description - HFCT-5208AM |
|
|
|
Link URL |
| Privacy Policy |
| ALLDATASHEET.COM |
| Does ALLDATASHEET help your business so far? [ DONATE ] |
About Alldatasheet | Advertisement | Datasheet Upload | Contact us | Privacy Policy | Link Exchange | Manufacturer List All Rights Reserved©Alldatasheet.com |
| Russian : Alldatasheetru.com | Korean : Alldatasheet.co.kr | Spanish : Alldatasheet.es | French : Alldatasheet.fr | Italian : Alldatasheetit.com Portuguese : Alldatasheetpt.com | Polish : Alldatasheet.pl | Vietnamese : Alldatasheet.vn Indian : Alldatasheet.in | Mexican : Alldatasheet.com.mx | British : Alldatasheet.co.uk | New Zealand : Alldatasheet.co.nz |
|
Family Site : ic2ic.com |
icmetro.com |
English ▼
English
Chinese
German
Japanese
Russian
Korean
Spanish
French
Italian
Portuguese
Polish
Vietnamese
Indian
Mexican
British
New Zealand
