LD-PD's Narrow Linewidth Tunable Laser is external-cavity-based, and compatible to OIF iTLA v1.3 electronics and I/O protocol. Leveraging unique technologies of Litecore epitaxial engineering and super luminescent diode which has been optimized for tunable lasers, the iTLA features of high power in polarization-maintained fiber, and Relative Intensity Noise lower than -145dB/Hz. Litecore iTLA is a best choice for Optical Coherent Communication (eg. for Silicon Photonics) acting as the external laser sources, and is also deployable in LiDAR for its high-power as well as wavelength tunability in a linear mode.
Name | Model | Description | Parameter | Price |
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Absolute Maximum Ratings and Environment Requirements
The Nano-iTLA will be damaged beyond the following absolute maximum ratings.
Table 1 Absolute Maximum Ratings
# | Parameters | Symbol | Min | Typ | Max | Units |
1 | Storage Temperature (Case) | Tstg | -40 | 85 | degC | |
2 | Operating Temperature (Case) | Tc | -5 | 75 | degC | |
3 | Total Power Dissipation | 3.7 | W | |||
4 | Operating Relative Humidity | RH | 5 | 85 | % | |
5 | Signal in PIN Voltage | -0.5 | Vcc+0.3 | V | ||
6 | Positive Supply Voltage | V3.3+ | -0.3 | 3.6 | V |
Optical Specifications
The optical specification of Nano -iTLA is listed in Table 2.
Table 2 Optical Specifications
# | Parameters | Symbol | Min | Typ | Max | Units |
7 | Frequency | F | 190.70 | 196.65 | THz | |
8 | Wavelength | λ | 1524.50 | 1572.06 | nm | |
9 | Frequency Error (BOL) | ΔFBOL | -1.5 | +1.5 | GHz | |
Frequency Error (EOL) | ΔFEOL | -2.5 | +2.5 | GHz | ||
10 | Fiber Output Power (over lifetime and operating condition) | Pout | 13 | 17 | dBm | |
11 | Output power variation across tuning range | ΔP | 1 | dB | ||
12 | Optical Power Accuracy (BOL) | PsBOL | +/-0.5 | dB | ||
Optical Power Accuracy (EOL) | PsEOL | +/-1.0 | dB | |||
13 | Relative Intensity Noise | RIN | -145 | dB/Hz | ||
14 | Side-Mode Suppression Ratio | SMSR | 45 | dB | ||
15 | Spectral Linewidth | δf | 100 | KHz | ||
16 | Optical Isolation | ISO | 25 | dB | ||
17 | Polarization Extinction Ratio over Tuning rang | PER | 20 | dB | ||
18 | Channel Space | f | 0.1 | GHz |
Mechanical and Electrical Interface
The mechanical and electrical specifications are listed in Table 3. The Figure2 depicts the mechanical outline of Nano - iTLA. The pin assignment of electrical interface is shown in Table 4, and the following Table 5 details the pin function. The electrical characteristics compliant to the OIF MSA 1.3 are listed in Table 6.
Table 3 Mechanical and Electrical Specifications
# | Parameters | Specification |
19 | Mechanical Dimensions | 25*15.6*5.65 |
20 | Fiber Type | PANDA Fiber, or equivalents |
21 | Minimum Fiber Bend Radius | Equal or better than 5mm |
22 | Fiber Length | 100+/-10cm |
23 | Connector | LC/UPC |
24 | Polarization Orientation | Parallel to slow axis |
25 | Electrical Interface | Molex 5054761010 |
Figure 2 Mechanical and Electrical Interface
Figure 3 3D-Model of Nano-iTLA
Table 4 Pin Assignment
Pin# | Name | Names | Pin# |
1 | +3.3V Supply | NC | 2 |
3 | MS | RST | 4 |
5 | SRQ | TxD | 6 |
7 | DIS | RxD | 8 |
9 | GND | NC | 10 |
Table 5 Pin Functions
# | Pin Name | Pin# | Type | Description |
26 | +3.3V Supply | 1 | Power | +3.3V Power Supply; tied together in Litecore iTLA |
27 | Ground | 9 | Power | Tied together in Litecore iTLA |
28 | DIS | 7 | LVTTL input Active Low | Disable laser output via Hardware control (i.e. bypass firmware) : Low = laser output OFF High = laser output controlled by protocol |
29 | SRQ | 5 | LVTTL output Active Low | Litecore to report a variety of conditions for service. Low = SRQ is asserted and SRQ conditions can be read, cleared and re-configured by host |
30 | MS | 3 | LVTTL input Low-to-high | low to high transition to reset RS232 interface; i.e., clear input buffers and terminate current package. |
31 | TxD | 6 | LVTTL output | Transmit data from iTLA to a host |
32 | RxD | 8 | LVTTL input | Receivedata by iTLA from a host |
33 | RST | 4 | LVTTL input Active Low | When low, laser output be disabled and iTLA stays in reset (i.e. RS232 off) (must remain high for laser to operate) |
Table 6 Electrical Characteristics
# | Parameter | Symbol | Min | Typ. | Max | Unit | |
34 | +3.3 Supply voltage | VCC | 3.13 | 3.3 | 3.47 | V | |
35 | +3.3 Supply current | ICC | - | 1500 | mA (Peak1) | ||
36 | Power Dissipation(EOL) | PD | 3.7 | W | |||
37 | Input voltage, low | VIL | 0.0 | 0.8 | V | ||
38 | Input voltage, high | VIH | 2.0 | VCC | V | ||
39 | Output voltage, low | (IOL= 4 mA) | VOL | 0.0 | 0.6 | V | |
40 | Output voltage, high | (IOH= -4 mA) | VOH | 2.4 | VCC | V | |
41 | Power Supply noise (for power supplied to the module ) (100Hz to 200MHz) | 1 | %rms | ||||
42 | RS-232 communication speed | 9600 | 9600 | 115200 | baud |
1The instantaneous current cannot exceed 1.5 amps.
7 Timing and Warm-up Specifications
Table 7 Timing and Warm -Up
# | Parameters | Symbol | Min | Typ | Max | Units |
43 | Time to light from LsEnable | 1 | Second | |||
44 | Channel/Frequency Tuning Time | 30 | Second | |||
45 | 0.1GHz Frequency-Step Fine Tuning Time | tF | 1 | Second | ||
46 | Power Adjustment Time | tP | 10 | Second | ||
47 | Warm-up till Freq & Power Locked | TWU | 30 | Second | ||
48 | Cold-up till Freq & Power Locked | TCU | 60 | Second |
8 Firmware Interface
The table 8 listed some of commands enabled. All the commands are compliant to the OIF MSA 1.3. Additionally, digital dither is not supported in the Litecore iTLA C band
Table 8 Table of Registers (Commands)
# | Command | RegisterName | Read/Write | Non-volatile (NV) | Description |
49 | 0x30 | Channel | RW | NV | Setting valid channel causes a tuning operation to occur. Also see the optional MHz resolution ChannelH register 0x65. |
50 | 0x31 | PWR | RW | NV | Sets the optical power set point as encoded as dBm*100. |
51 | 0x32 | ResEna | RW | Reset/Enable - Enable output, hard and soft reset. | |
52 | 0x35 | FCF1 | RW | NV | Allows the first channel's frequency to be defined for channel numbering. (THz)Also see the optional MHz resolution FCF3 register 0x67. |
53 | 0x36 | FCF2 | RW | NV | Allows the first channel's frequency to be defined for channel numbering. (GHz*10) Also see the optional MHz resolution FCF3 register 0x67. |
54 | 0x37-0x3F | Reserved | Reserved for OIF configuration registers. | ||
55 | 0x40 | LF1 | R | Returns channel's frequency as THz. Also see the optional MHz resolution LF3 register 0x68. | |
56 | 0x41 | LF2 | R | Returns channel's frequency as GHZ*10. Also see the optional MHz resolution LF3 register 0x68. | |
57 | 0x42 | OOP | R | Returns the optical power encoded as dBm*100. | |
58 | 0x43 | CTemp | R | Returns the current temperature (monitored by the temperature alarm) encoded as °C*100. | |
59 | 0x44-0x4E | Reserved | Reserved for OIF status registers. | ||
60 | 0x4F | FTFR | R | Returns min/max fine tune frequency range (MHz). | |
61 | 0x50 | OPSL | R | Returns themin possible optical power setting. | |
62 | 0x51 | OPSH | R | Returns the max possible optical power setting. | |
63 | 0x52 | LFL1 | R | Laser's first frequency (THz). Also see the optional MHz resolution LFL3 register 0x69. | |
64 | 0x53 | LFL2 | R | Laser's first frequency (GHz*10). Also see the optional MHz resolution LFL3 register 0x69. | |
65 | 0x54 | LFH1 | R | Laser's last frequency (THz). Also see the optional MHz resolution LFH3 register 0x6A. | |
66 | 0x55 | LFH2 | R | Laser's last frequency (GHz*10). Also see the optional MHz resolution LFH3 register 0x6A. | |
67 | 0x56 | LGrid | R | Laser's minimum supported grid spacing (GHz*10). Also see the optional MHz resolution LGrid2 register 0x6B. |