OC-48/STM-16 Transmitter STX48 Series Product Description The STX48 modules are laser transmitters designed to meet or exceed the SONET/SDH optical interface requirements at OC-48/STM-16 (2.5 Gb/s) data rate. Many performance versions are available which are fully compliant with Short Reach, Intermediate Reach and Long Reach specifications at 1310 nm or 1550 nm wavelength. The Short Reach version uses uncooled Fabry Perot lasers while the Intermediate Reach version uses uncooled DFB lasers. For the Long Reach version, uncooled DFB lasers with internal optical isolators are used. All modules satisfy Class I Laser Safety requirements in accordance with the US FDA/CDRH and international IEC-825 standards. The transmitter incorporates an Automatic Power Control (APC) circuit to maintain the optical output power at a constant level against variations in ambient temperature and device aging. It also features a Mode Selector input pin which selects between clocked and non-clocked operation. In the clocked operation mode, the input DATA is resynchronized by the input CLOCK before driving the laser diode in order to reduce output jitter to a minimum. A Transmitter Disable control input is also provided. Both the laser bias current and back-facet light output can be monitored as well. All STX48 transmitter modules are available in two power supply options: single +5V and single -5 V. The DATA and CLOCK interface can either be direct PECL/ECL or via AC coupling. The operating temperature range is -40°C to +85°C for the Short Reach and Intermediate Reach 1310 nm version and 0°C to +70°C for the Long Reach version. All modules are housed in a 24-pin dual-in-line metal package with a single mode fiber pigtail, which is terminated with ST, FC or SC connector. Features Fully compliant with SONET/SDH OC-48/ STM-16 (2.5 Gb/s) specifications Long Reach 1310 nm & 1550 nm as well as Intermediate Reach and Short Reach Eye Safe (Class I Laser Safety) Mode Selector switch between Clocked or Nonclocked operation -40°C to +85°C Operating Temperature (Intermediate Reach and Short Reach) 24-pin DIP metal package FC, ST, SC-connectorized fiber pigtails Differential PECL DATA & CLOCK interface Single +5 V and - 5 V supply option Absolute Maximum Ratings Parameter Storage Temperature Operating Case Temperature1 “I” option (SR & IR only) “H” option Symbol Minimum Maximum Units TST - 40 + 85 °C - 40 + 85 0 + 70 VOP °C Supply Voltage VCC - VEE 0 + 6.0 V Input Voltage VIN - VEE VEE VCC - VEE V - - Lead Soldering Temperature & Time 260°C, 10 sec R04.2008.04.30 Oplink Communications, Inc. STX48 Series Transmitter Performance Characteristics Parameter (Over Operating Case Temperature.) Symbol Minimum B Data Rate PO Average Optical Output Power (50% duty cycle) Phi /Plo Extinction Ratio Short Reach (SR) Intermediate Reach (IR) Center Wavelength λC Long Reach (LR) 1310 nm Long Reach (LR) 1550 nm Typical Maximum Units Gb/s 0.05 2.5 3.0 - 10.0 - 7.0 - 3.0 - 5.0 - 3.0 0 - 2.0 0 3.0 8.2 - - 1266 1310 1360 1266 1310 1360 1280 1310 1335 1500 1550 1580 Spectral Width (RMS) Short Reach ΔλRMS - - 4.0 Spectral Width (-20 dB) Intermediate Reach & Long Reach Δλ20 - - 1.0 Side Mode Suppression Ratio Intermediate Reach & Long Reach SMSR 30 - - Transmitter Output Eye dBm dB nm nm dB Compliant with Bellcore TR-NWT-000253 and ITU-T Recommendation G.957 Receiver Electrical Interface Parameter Symbol Minimum Typical Maximum Supply Voltage 1 VCC - VEE Supply Current I 4.75 5.0 5.25 V - 200 300 mA VIH VCC - 1.165 - VCC - 0.880 V Input LOW Voltage (DATA & CLOCK, PECL) VIL VCC - 1.810 - VCC - 1.475 V Input Voltage (DATA & CLOCK, PECL) VIN 0.30 0.80 1.00 Vp-p Input DATA & CLOCK timing TDC 200 - 300 ps Clocked VMSCK VEE - VEE + 1.5 V Non-Clocked Input HIGH Voltage (DATA & CLOCK, PECL) MODE SELECTOR Input Voltage Units VMSNCK VCC - 1.5 - VCC V Transmitter Disable Voltage VDIS VCC - 2.0 - VCC V Transmitter Enable Voltage VEN VEE - VEE + 0.6 V LD Bias Alarm Output Voltage Differential Bias Monitor Voltage HIGH Voltage VALMH VCC - VEE VCC V LOS Voltage VALML VEE - 1.0 - VEE + 0.5 V - 100 200 - 300 500 10 100 250 at 25 Decreasing Light Input Differential Back Facet Monitor Voltage VBM, DIF VFM,DIF mV mV For +5V single supply modules, connect VCC to +5V and VEE to 0V or GND (circuit ground). The package housing is internally connected to VEE. For - 5V single supply modules, connect VCC to 0V or GND (circuit ground) and VEE to - 5V. The package housing is internally connected to VCC. 1 Related OC-48/STM-16 Transceiver & Receiver Modules SRX-48 SRC-48 DTR-2488-SM DTR-2488-SM2 DTC-48 Oplink Communications, Inc. : Receiver without Clock Recovery (24-pin DIP) : Receiver with Clock Recovery (24-pin DIP) : Transceiver without Clock Recovery (industry standard 1x9 package) : Transceiver without Clock Recovery (industry standard 2x9 package) : Transceiver with Clock Recovery (industry standard 2x9 package) 2 R04.2008.04.30 STX48 Series Application Notes When the DATA+ input is at logic HIGH and DATA- input is at logic LOW, the LD is ON; and vice versa. The transmitter is normally enabled (i.e. when the TX DISABLE control input is not connected). When the TX DISABLE input voltage is higher than VCC - 2 V, the laser is disabled (less than -30dBm output power) independent of the input data. The transmitter incorporates an Average Power Control (APC) loop to stabilize the transmitter average optical output power against temperature variation. The APC loop always acts to keep the transmitter average optical output power at a constant value (when the transmitter is enabled). Therefore, when the input data is all continuous “zeroes” or all continuous “ones”, the transmitter optical output power is a constant level equal to the nominal average optical output power (not at the “OFF” level or at the “ON” level). When the MODE SELECTOR input is left unconnected or at logic “LOW” (VEE to VEE + 1.5V), the transmitter is in clocked operation mode. In this mode, the input clock resynchronizes the incoming data to reduce timing jitter. The timing between the DATA and CLOCK inputs is as shown below. When the MODE SELECTOR input at logic “HIGH” (VCC - 1.5V to VCC), the transmitter is in non-clocked operation mode. In this mode, the CLOCK inputs are not used and hence need not be provided. The transmitter has internal 50 ohm termination to V TD (pin 6) for DATA inputs & V TC (pin 19) for CLOCK inputs. The DATA & CLOCK interface can be either direct PECL/ECL coupling or via AC coupling as shown below. The use of differential signals is strongly recommended. In cases where only single-ended signal is available, the unused DATA input pin should be biased to VCC - 1.29 V for direct PECL/ ECL coupling or bypassed to AC Ground for AC coupling. Similarly, the unused CLOCK input pin should be bypassed with a 0.01 μF capacitor to VEE . Interface Circuit 50 ohm line DATA+ / CLK+ DATA+/ CLK+ 7 / 18 VCC - 2 V 0.01 STX-48 DATA-/ CLK- 5 / 20 50 ohm line VCC VCC LD PD 3KΩ 6 / 19 STX-48 5 / 20 50 ohm line Timing Diagram (Clocked Operation) Monitor Circuit 10Ω 0.022 7 / 18 DIFFERENTIAL AC-COUPLED DIFFERENTIAL DIRECT-COUPLED PECL 3KΩ 0.022 6 / 19 0.01 DATA- / CLK- Ib 50 ohm line BM+ BM - Imon 200Ω TDC 3KΩ 3KΩ FM + FM DATA - Control Circuit Bias Circuit VEE Oplink Communications, Inc. CLOCK VEE 3 R04.2008.04.30 STX48 Series 46335 Landing Parkway Fremont, CA 94538-6407 Tel: (510) 933-7200 Fax: (510) 933-7300 Email: [email protected] Package Outline (Dimension in inches) Pinout Assignments PIN FUNCTION PIN FUNCTION 1 VCC 24 VCC 2 VCC 23 VCC 3 FM + (LD FACET MONITOR +) 22 BM+ (LD BIAS MONITOR +) 4 FM - (LD FACET MONITOR -) 21 BM- (LD BIAS MONITOR -) 5 DATA INPUT - 20 CLK - (INPUT CLOCK -) 6 VTD (TERMINATION FOR DATA) 19 VTC (TERMINATION FOR CLK) 7 DATA INPUT + 18 CLK+ (INPUT CLOCK +) 8 DO NOT CONNECT (FOR INTERNAL USE ONLY) 17 MODE SELECTOR (CLOCKED or NON-CLOCKED) 9 VCC 16 TX DISABLE INPUT 10 VCC 15 ALM (LD BIAS ALARM) 11 VEE 14 VEE 12 VEE 13 VEE Laser Safety: All transceivers are Class I Laser products per FDA/CDRH and IEC-60825 standards. They must be operated under specified operating conditions. Oplink Communications, Inc. DATE OF MANUFACTURE: This product complies with 21 CFR 1040.10 and 1040.11 Meets Class I Laser Safety Requirements Ordering Information STX 4 8 0 0 0 Type Optical Output Power Temperature Range Option 2x5 +5V= 4 2x5 -5V= B -7dBm (Typ.)= B -3dBm (Typ.)= D 0dBm (Typ.)= F -40 ~85˚C (SR & IR only)= I 0~70˚C (LR only)= H pigtail FC= P1 pigtail ST= P2 pigtail SC= P3 Distance Option Short Reach (-7dBm only)= S0 Intermediate Reach (“-3dBm” only)=S3 Long Reach1310nm (“0dBm” only)= S4 Long Reach1550nm (“0dBm” only)= F2 Oplink Communications, Inc. reserves the right to make changes in equipment design or specifications without notice. Information supplied by Oplink Communications, Inc. is believed to be accurate and reliable. However, no responsibility is assumed by Oplink Communications, Inc. for its use nor for any infringements of third parties, which may result from its use. No license is granted by implication or otherwise under any patent right of Oplink Communications, Inc. R04. 2008.04.30 © 2008, Oplink Communications, Inc. 4