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Ultrahigh-speed Optical Integration Device that Achieves 10x Speed DVD Playback Laser Coupler
SLK3001PE
To respond to the needs emerging from the growing market for DVD video systems and DVD-ROM drives for computers, Sony has now developed the SLK3001PE optical integration device (laser coupler), which forms the heart of the DVD playback optical pickup. This device supports a 10x DVD playback speed, which is the industry's fastest speed, by incorporating a newly developed PDIC. The SLK3001PE is the RF "module-less" product based on a pulsation laser that guarantees 70C operation for the first time in the industry and provides a circularly polarized optical output. By incorporated these and other technologies the SLK3001PE achieves simplification, miniaturization, and increased performance in the DVD playback optical pickup.
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The industry's fastest DVD playback speed (10x) and a 100-MHz bandwidth RF module-less, 70C guaranteed Circularly polarized optical output for high playability Three-stage gain switching function Miniature 16-pin ceramic package
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The Industry's Fastest DVD Playback Speed (10x) and a 100-MHz Bandwidth
The SLK3001PE includes an ultrahighspeed PDIC fabricated using Sony's newly-developed ultrahigh-speed high integration density bipolar process P-42B* 1 , and achieves a 100-MHz bandwidth. This allows this product to support the industry's highest DVD playback speed of 10x, and to generate the tracking error signal, the focus error signal, and the RF signal required of optical pickups. (See figure 2.) This device can respond to a wide range of needs in applications from DVD video to high-speed DVD-ROM drivers for computers.
*1: See pages 8 to 13 in this issue for more information on the P-42B process.
RF Module-less, 70C Guaranteed
This device includes a pulsation laser with the industry's highest guaranteed temperature, 70C. (See figure 1.) The SLK3001PE is the RF module-less product and achieves reduced noise, miniaturization, and increased reliability over a wide temperature range. Since this device is the RF module-less product, no special measures for reduction of undesired radiation are required. The SLK3001PE can implement simple and low-cost optical pickups. (See figure 3.)
Three-stage Gain Switching Function
The PDIC used includes a three-stage gain switching function, and thus the SLK3001PE can handle the playback of three types of disc (single-layer DVD discs, dual-layer DVD discs, and superaudio CDs) while holding the laser output fixed. This allows the SLK3001PE to respond to a wide range of needs.
Miniature 16-pin Ceramic Package
The SLK3001PE achieves miniaturization and reduced cost by adopting a miniature thin-form ceramic package that is essentially the same size as Sony's CD laser couplers that have a proven track record as mass-produced products. (See figure 1.)
Circularly Polarized Optical Output for High Playability
The SLK3001PE incorporates a newlydeveloped low-cost 1/4-wavelength plate, and achieves circularly polarized optical output. In addition, since the internal optical system is an unpolarized optical system, this device not affected by variations in disc birefringence and thus can easily implement a high playability optical pickup. At the same time it achieves an even higher level of stability with respect to the return light noise.
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The laser coupler is a hybrid optical integrated device implemented in an ultrafine fabrication technology. This device allows the optical pickup to have a surprisingly simple structure, and thus increases system reliability. This device is an ambitious creation for a DVD playback product. I hope it will be used in many DVD players. I strongly recommend it.
Track direction
Built-in 1/4-wavelength plate
F4 F3 F2 F1
F8 F7 F6 F5
R4 R3 R2 R1
16-pin ceramic package
Phase comparator A
Device size: 7.5 mm x 6.5 mm x 2.0mmt Microprism
Disc Pulsation LD
A = F1 + F2 B = F5 + F6 C = F7 + F8 D = F3 + F4
Outputs for DPD use
D C Adder B Phase comparator Tracking error (DPD method)
PDIC
Focus error: Differential spot size method Tracking error: DPD method (phase difference detection)
A2 = F1 + F5 + R3 B2 = F3 + F7 + R1 C2 = F4 + F8 + R2 D2 = F2 + F6 + R4
Outputs for focus servo use
Focus error FE = (A2 + C2) - (B2 + D2) (Differential spot size method)
s Figure 1 Device Structure
s Figure 2 Servo Signal Calculation
Disc NA = 0.6
GND 9 Im 10 G.SW 11
8 LDA 7 VCC 6 VC 5A
16 15 14 13 12 11 10 9
1 2 3
Objective lens Collimating lens
D 12 C 13 RF- 14 D2 15 C2 16
Top view
4B 3 RF+ 2 A2 1 B2
Bottom view (GND)
4 5 6 7 8
NA = 0.086 (7x system)
s Figure 4 Pin Configuration
SLK3001PE
s Table 1
Item LD operating current LD operating voltage
Main Specifications
Symbol Iopo Vop Po RIN Imon VCC VC ICC F Tc Typical value 75.0 2.30 655 1.2 Under-125 0.1 5.0 2.5 20 100 -10 to +70 Unit mA V nm mW dB/Hz mA V V mA MHz C
s Figure 3 Sample Optical Pickup Structure
LD wavelength Optical output Relative intensity noise Monitor PD current PDIC supply voltage PDIC current consumption Frequency band Operating temperature

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